Version Packages - #1985

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Version Packages#1985
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This PR was opened by the Changesets release GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated.

Releases

agents@0.20.0

Minor Changes

  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.

    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.

    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.

    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.

    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.

    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.

    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.

    Deprecations in this release:

    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.

    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.

Patch Changes

  • #19816c01c8d Thanks @agent-think! - Recycle reusable Browser Run sessions after the platform reports HTTP 410 for an expired session.

@cloudflare/codemode@0.5.1

Patch Changes

  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.

    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.

    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.

    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.

    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.

    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.

    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.

    Deprecations in this release:

    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.

    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.

@cloudflare/agent-think@0.0.4

Patch Changes

  • Updated dependencies [6c01c8d, 447013d]:
    • agents@0.20.0
    • @cloudflare/think@0.15.0

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

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@github-actions
github-actionsBotforce-pushed the changeset-release/main branch from aa831e6 to 5b8c636CompareJuly 27, 2026 17:50
@mattzcarey
mattzcarey merged commit f089c5b into mainJul 27, 2026
@mattzcarey
mattzcarey deleted the changeset-release/main branch July 27, 2026 17:53
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@mattzcarey
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
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}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
Version Packages - #1985
Merged
mattzcarey merged 1 commit into
mainfrom 
changeset-release/main
Jul 27, 2026
Merged
Version Packages#1985
mattzcarey merged 1 commit into
mainfrom 
changeset-release/main
Conversation
@github-actions
@github-actionsgithub-actionsBot
commented
Jul 27, 2026•

edited

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This PR was opened by the Changesets release GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated.
Releases
agents@0.20.0
Minor Changes
  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.
    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.
    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.
    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.
    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.
    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.
    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.
    Deprecations in this release:
    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.
    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.
Patch Changes
  • #19816c01c8d Thanks @agent-think! - Recycle reusable Browser Run sessions after the platform reports HTTP 410 for an expired session.
@cloudflare/codemode@0.5.1
Patch Changes
  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.
    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.
    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.
    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.
    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.
    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.
    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.
    Deprecations in this release:
    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.
    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.
@cloudflare/agent-think@0.0.4
Patch Changes
  • Updated dependencies [6c01c8d, 447013d]:

    • agents@0.20.0
    • @cloudflare/think@0.15.0
devin-ai-integration[bot]
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Version Packages - #1985
Merged
mattzcarey merged 1 commit into
mainfrom 
changeset-release/main
Jul 27, 2026
Merged
Version Packages#1985
mattzcarey merged 1 commit into
mainfrom 
changeset-release/main
Conversation
@github-actions
@github-actionsgithub-actionsBot
commented
Jul 27, 2026•

edited

Loading

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This PR was opened by the Changesets release GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated.
Releases
agents@0.20.0
Minor Changes
  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.
    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.
    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.
    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.
    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.
    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.
    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.
    Deprecations in this release:
    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.
    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.
Patch Changes
  • #19816c01c8d Thanks @agent-think! - Recycle reusable Browser Run sessions after the platform reports HTTP 410 for an expired session.
@cloudflare/codemode@0.5.1
Patch Changes
  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.
    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.
    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.
    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.
    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.
    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.
    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.
    Deprecations in this release:
    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.
    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.
@cloudflare/agent-think@0.0.4
Patch Changes
  • Updated dependencies [6c01c8d, 447013d]:

    • agents@0.20.0
    • @cloudflare/think@0.15.0
devin-ai-integration[bot]
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✅ Devin Review: No Issues Found
Devin Review analyzed this PR and found no bugs or issues to report.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Version Packages - #1985
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Version Packages#1985
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This PR was opened by the Changesets release GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated.
Releases
agents@0.20.0
Minor Changes
  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.
    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.
    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.
    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.
    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.
    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.
    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.
    Deprecations in this release:
    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.
    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.
Patch Changes
  • #19816c01c8d Thanks @agent-think! - Recycle reusable Browser Run sessions after the platform reports HTTP 410 for an expired session.
@cloudflare/codemode@0.5.1
Patch Changes
  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.
    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.
    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.
    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.
    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.
    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.
    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.
    Deprecations in this release:
    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.
    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.
@cloudflare/agent-think@0.0.4
Patch Changes
  • Updated dependencies [6c01c8d, 447013d]:

    • agents@0.20.0
    • @cloudflare/think@0.15.0
devin-ai-integration[bot]
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✅ Devin Review: No Issues Found
Devin Review analyzed this PR and found no bugs or issues to report.
Open in Devin Review
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@mattzcarey
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July 27, 2026 17:53
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
Version Packages - #1985
Merged
mattzcarey merged 1 commit into
mainfrom 
changeset-release/main
Jul 27, 2026
Merged
Version Packages#1985
mattzcarey merged 1 commit into
mainfrom 
changeset-release/main
Conversation
@github-actions
@github-actionsgithub-actionsBot
commented
Jul 27, 2026•

edited

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Contributor
This PR was opened by the Changesets release GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated.
Releases
agents@0.20.0
Minor Changes
  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.
    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.
    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.
    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.
    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.
    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.
    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.
    Deprecations in this release:
    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.
    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.
Patch Changes
  • #19816c01c8d Thanks @agent-think! - Recycle reusable Browser Run sessions after the platform reports HTTP 410 for an expired session.
@cloudflare/codemode@0.5.1
Patch Changes
  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.
    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.
    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.
    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.
    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.
    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.
    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.
    Deprecations in this release:
    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.
    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.
@cloudflare/agent-think@0.0.4
Patch Changes
  • Updated dependencies [6c01c8d, 447013d]:

    • agents@0.20.0
    • @cloudflare/think@0.15.0
devin-ai-integration[bot]
devin-ai-integrationBot
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Jul 27, 2026
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✅ Devin Review: No Issues Found
Devin Review analyzed this PR and found no bugs or issues to report.
Open in Devin Review
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github-actionsBotforce-pushed
the
changeset-release/main
branch
from
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5b8c636CompareJuly 27, 2026 17:50
@mattzcarey
mattzcarey
merged commit f089c5b
into
mainJul 27, 2026
@mattzcarey
mattzcarey
deleted the

changeset-release/main

branch
July 27, 2026 17:53
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Version Packages - #1985
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mattzcarey merged 1 commit into
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Jul 27, 2026
Merged
Version Packages#1985
mattzcarey merged 1 commit into
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This PR was opened by the Changesets release GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated.
Releases
agents@0.20.0
Minor Changes
  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.
    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.
    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.
    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.
    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.
    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.
    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.
    Deprecations in this release:
    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.
    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.
Patch Changes
  • #19816c01c8d Thanks @agent-think! - Recycle reusable Browser Run sessions after the platform reports HTTP 410 for an expired session.
@cloudflare/codemode@0.5.1
Patch Changes
  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.
    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.
    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.
    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.
    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.
    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.
    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.
    Deprecations in this release:
    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.
    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.
@cloudflare/agent-think@0.0.4
Patch Changes
  • Updated dependencies [6c01c8d, 447013d]:

    • agents@0.20.0
    • @cloudflare/think@0.15.0
devin-ai-integration[bot]
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✅ Devin Review: No Issues Found
Devin Review analyzed this PR and found no bugs or issues to report.
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July 27, 2026 17:53
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Version Packages - #1985
Merged
mattzcarey merged 1 commit into
mainfrom 
changeset-release/main
Jul 27, 2026
Merged
Version Packages#1985
mattzcarey merged 1 commit into
mainfrom 
changeset-release/main
Conversation
@github-actions
@github-actionsgithub-actionsBot
commented
Jul 27, 2026•

edited

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Contributor
This PR was opened by the Changesets release GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated.
Releases
agents@0.20.0
Minor Changes
  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.
    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.
    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.
    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.
    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.
    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.
    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.
    Deprecations in this release:
    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.
    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.
Patch Changes
  • #19816c01c8d Thanks @agent-think! - Recycle reusable Browser Run sessions after the platform reports HTTP 410 for an expired session.
@cloudflare/codemode@0.5.1
Patch Changes
  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.
    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.
    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.
    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.
    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.
    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.
    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.
    Deprecations in this release:
    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.
    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.
@cloudflare/agent-think@0.0.4
Patch Changes
  • Updated dependencies [6c01c8d, 447013d]:

    • agents@0.20.0
    • @cloudflare/think@0.15.0
devin-ai-integration[bot]
devin-ai-integrationBot
reviewed
Jul 27, 2026
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✅ Devin Review: No Issues Found
Devin Review analyzed this PR and found no bugs or issues to report.
Open in Devin Review
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@mattzcarey
mattzcarey
merged commit f089c5b
into
mainJul 27, 2026
@mattzcarey
mattzcarey
deleted the

changeset-release/main

branch
July 27, 2026 17:53
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
Version Packages - #1985
Merged
mattzcarey merged 1 commit into
mainfrom 
changeset-release/main
Jul 27, 2026
Merged
Version Packages#1985
mattzcarey merged 1 commit into
mainfrom 
changeset-release/main
Conversation
@github-actions
@github-actionsgithub-actionsBot
commented
Jul 27, 2026•

edited

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This PR was opened by the Changesets release GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated.
Releases
agents@0.20.0
Minor Changes
  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.
    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.
    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.
    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.
    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.
    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.
    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.
    Deprecations in this release:
    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.
    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.
Patch Changes
  • #19816c01c8d Thanks @agent-think! - Recycle reusable Browser Run sessions after the platform reports HTTP 410 for an expired session.
@cloudflare/codemode@0.5.1
Patch Changes
  • #1557447013d Thanks @mattzcarey! - Add MCP SDK v2 client and server support. MCPClientConnection now uses the exact-pinned @modelcontextprotocol/client@2.0.0-beta.5. It probes for stateless MCP with server/discover, then falls back to the legacy initialize handshake on the same connection when needed. The SDK auto-fulfills stateless elicitation input_required results through the existing form and URL elicitation handlers while callTool, getPrompt, and readResource remain pending. OAuth reauthorization discards redirect-scoped discovery after token issuance and preserves discovery-triggered authentication, allowing a changed authorization server to be rediscovered and registered without reusing the prior issuer's credentials. Legacy pushed elicitation, Streamable HTTP, SSE, RPC, OAuth, and hibernation recovery remain supported. Codemode's MCP connector now uses an SDK-neutral structural boundary compatible with both MCP client generations.
    Add MCP SDK v2 support to createMcpHandler. Pass a factory returning McpServer or Server from the exact-pinned @modelcontextprotocol/server@2.0.0-beta.5 peer dependency to serve stateless MCP with legacy compatibility by default. The new agents/mcp/server entry exports the stateless Agents handler without retaining McpAgent, WorkerTransport, MCP client transports, PartyServer, or SDK v1 modules. The returned handler remains callable for Worker dispatch and exposes the lower-level SDK fetch(request, options?) method plus typed notify methods; upstream close and event-bus internals are not part of the Agents surface. The retained v1 server APIs use the exact-pinned @modelcontextprotocol/sdk@1.29.0 peer dependency.
    The legacy compatibility fallback now uses SDK v2's web-standard transport, including fail-fast handling for unsupported server-to-client requests, active-request teardown, and the same 25-second Cloudflare SSE keepalive previously supplied by WorkerTransport. It returns 405 for session-only GET and DELETE requests without constructing an application server. createLegacyMcpHandler remains an explicit public API for SDK v1 servers and complete WorkerTransport options.
    The MCP client storage codec now preserves stateless discovery data with resumed HTTP sessions and preserves the binding name and props required to restore RPC servers. Stored HTTP session IDs from older Agents versions have no associated protocol version. The upgraded client discards those IDs and reconnects instead of sending an unsafe resumed request, so in-flight work tied to an old remote session does not resume.
    The v2 callable handler maps verified provider-issued metadata from compatible @cloudflare/workers-oauth-provider releases to standard MCP AuthInfo while preserving getMcpAuthContext().props.
    The Workers handler rejects malformed, opaque, and non-HTTP browser Origins. Its default allowlist includes localhost-class Origins, the endpoint's workers.dev hostname, and a concrete corsOptions.origin hostname. It applies matching Host checks to localhost and workers.dev endpoints. Custom-domain deployments with wildcard CORS can set allowedHostnames and allowedOriginHostnames explicitly, or set allowedOriginHostnames: "*" when trusted upstream middleware already enforces the required Origin policy. Requests without Origin remain valid for non-browser MCP clients. Default CORS preflights allow the stateless Mcp-Method and Mcp-Name request headers.
    @cloudflare/codemode is now an optional peer. Applications that import agents/skills or agents/browser install Codemode explicitly; MCP-only applications no longer install it transitively.
    Deprecations in this release:
    • McpAgent is deprecated and feature-frozen as a stateful SDK v1 path. New servers should use an SDK v2 factory with createMcpHandler from agents/mcp/server.
    • Passing an SDK v1 server to the overloaded createMcpHandler is deprecated for removal in the next major release. Move the server to an SDK v2 factory. Use createLegacyMcpHandler only to temporarily retain sessionful SDK v1 behavior while migrating.
    • The explicit result-schema overloads MCPClientManager.callTool(params, resultSchema, options) and withX402Client(...).callTool(confirm, params, resultSchema, options) are deprecated. Use callTool(params, options) or callTool(confirm, params, options) instead.
    experimental_createMcpHandler was already deprecated and remains scheduled for removal in the next major release. Its warning now directs users to an SDK v2 factory first and names createLegacyMcpHandler only as a temporary bridge for sessionful SDK v1 behavior.
@cloudflare/agent-think@0.0.4
Patch Changes
  • Updated dependencies [6c01c8d, 447013d]:

    • agents@0.20.0
    • @cloudflare/think@0.15.0
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✅ Devin Review: No Issues Found
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