[v1.x] fix: add missing size field to ResourceSchema - #1575

Merged
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom
olaservo:fix/resource-schema-size-field-v1x
Mar 26, 2026
Merged

[v1.x] fix: add missing size field to ResourceSchema#1575
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom
olaservo:fix/resource-schema-size-field-v1x

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@olaservo

@olaservoolaservo commented Feb 22, 2026

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Summary

  • Adds the optional size number field to ResourceSchema in the Zod schema definition, matching the MCP specification (added in spec revision 2025-06-18)
  • The spec defines size?: number on the Resource interface, but the Zod schema was missing it
  • Downstream schemas (ResourceLinkSchema, ListResourcesResultSchema) inherit the field automatically

Backport of #1574 for the v1.x branch.

Fixes#1573

Test plan

  • pnpm typecheck passes (pre-existing unrelated error in test helpers only)
  • Verified ResourceSchema.shape.size exists after the change

🤖 Generated with Claude Code

@olaservo@claude
fix: add missing size field to ResourceSchema
d9cc4ab
The MCP specification defines an optional `size?: number` field on the
Resource interface (added in spec revision 2025-06-18), but the Zod
schema was missing it. This adds the field so servers can declare
resource sizes and hosts can display file sizes / estimate context
window usage.
Fixesmodelcontextprotocol#1573
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@olaservo
olaservo requested a review from a team as a code ownerFebruary 22, 2026 15:39
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Latest commit: fa7221d

The changes in this PR will be included in the next version bump.

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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npm i https://pkg.pr.new/@modelcontextprotocol/sdk@1575

commit: fa7221d

@felixweinberger
felixweinberger enabled auto-merge (squash) March 26, 2026 16:09
@felixweinberger
felixweinberger merged commit ddadaa6 into modelcontextprotocol:v1.xMar 26, 2026
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@felixweinbergerfelixweinberger mentioned this pull request Mar 30, 2026
Merged
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olaservo added a commit to olaservo/skilljack-mcp that referenced this pull request Apr 13, 2026
@olaservo@claude
Add resource size field using MCP SDK 1.29.0
6e4c13b
Bump @modelcontextprotocol/sdk to ^1.29.0 which adds the missing `size`
field to ResourceSchema (modelcontextprotocol/typescript-sdk#1575).
Return file size in bytes on skill resources so clients can estimate
context usage before fetching.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
ContextVM-org added a commit to ContextVM/mcp-sdk that referenced this pull request Jun 12, 2026
@ContextVM-org
sync: port upstream v1.29.0 fixes
2f0bfa7
Ported functional changes from upstream v1.x (17 commits behind,
v1.28.0 through v1.29.0+). Only retained-fork-surface changes
applied; auth, HTTP, and CI-only commits skipped.
Changes ported:
- stdio: ReadBuffer maxBufferSize limit (modelcontextprotocol#2239)
- stdio: windowsHide always on Win32, removed isElectron() (modelcontextprotocol#1640)
- stdio: try/catch error handling on read buffer overflow
- types: extensions capability on ClientCapabilities/ServerCapabilities (modelcontextprotocol#1811)
- types: size field on ResourceSchema (modelcontextprotocol#1575)
- zod-compat: prioritize zod issues with path formatting (modelcontextprotocol#1503)
- protocol: conditional abort controller cleanup (modelcontextprotocol#1462)
Intentionally kept:
- AuthInfo import from ./shared/auth-info.js (not reverted to auth/types.js)
- All removed transports, auth, and HTTP modules stay out
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, '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
[v1.x] fix: add missing size field to ResourceSchema - #1575
Merged
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom 
olaservo:fix/resource-schema-size-field-v1x
Mar 26, 2026
Merged
[v1.x] fix: add missing size field to ResourceSchema#1575
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom 
olaservo:fix/resource-schema-size-field-v1x
Conversation
@olaservo
@olaservoolaservo
commented
Feb 22, 2026

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Summary
  • Adds the optional size number field to ResourceSchema in the Zod schema definition, matching the MCP specification (added in spec revision 2025-06-18)
  • The spec defines size?: number on the Resource interface, but the Zod schema was missing it
  • Downstream schemas (ResourceLinkSchema, ListResourcesResultSchema) inherit the field automatically
Backport of #1574 for the v1.x branch.
Fixes#1573
Test plan
  • pnpm typecheck passes (pre-existing unrelated error in test helpers only)
  •  Verified ResourceSchema.shape.size exists after the change
🤖 Generated with Claude Code
@olaservo@claude
fix: add missing size field to ResourceSchema
d9cc4ab
The MCP specification defines an optional `size?: number` field on the
Resource interface (added in spec revision 2025-06-18), but the Zod
schema was missing it. This adds the field so servers can declare
resource sizes and hosts can display file sizes / estimate context
window usage.
Fixesmodelcontextprotocol#1573
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@olaservo
olaservo
requested a review
from a team
as a code ownerFebruary 22, 2026 15:39
@changeset-bot
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commented
Feb 22, 2026•

edited

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🦋 Changeset detected
Latest commit: fa7221d
The changes in this PR will be included in the next version bump.
Not sure what this means? Click here to learn what changesets are.
Click here if you're a maintainer who wants to add another changeset to this PR
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Feb 22, 2026•

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npm i https://pkg.pr.new/@modelcontextprotocol/sdk@1575

commit: fa7221d
@felixweinberger
felixweinberger
enabled auto-merge (squash)
March 26, 2026 16:09
@felixweinberger
felixweinberger
merged commit ddadaa6
into
modelcontextprotocol:v1.xMar 26, 2026

8 checks passed

@felixweinbergerfelixweinberger
mentioned this pull request
Mar 30, 2026
 Merged

9 tasks
olaservo added a commit
to olaservo/skilljack-mcp
that referenced
this pull request
Apr 13, 2026
@olaservo@claude
Add resource size field using MCP SDK 1.29.0
6e4c13b
Bump @modelcontextprotocol/sdk to ^1.29.0 which adds the missing `size`
field to ResourceSchema (modelcontextprotocol/typescript-sdk#1575).
Return file size in bytes on skill resources so clients can estimate
context usage before fetching.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
ContextVM-org added a commit
to ContextVM/mcp-sdk
that referenced
this pull request
Jun 12, 2026
@ContextVM-org
sync: port upstream v1.29.0 fixes
2f0bfa7
Ported functional changes from upstream v1.x (17 commits behind,
v1.28.0 through v1.29.0+). Only retained-fork-surface changes
applied; auth, HTTP, and CI-only commits skipped.
Changes ported:
- stdio: ReadBuffer maxBufferSize limit (modelcontextprotocol#2239)
- stdio: windowsHide always on Win32, removed isElectron() (modelcontextprotocol#1640)
- stdio: try/catch error handling on read buffer overflow
- types: extensions capability on ClientCapabilities/ServerCapabilities (modelcontextprotocol#1811)
- types: size field on ResourceSchema (modelcontextprotocol#1575)
- zod-compat: prioritize zod issues with path formatting (modelcontextprotocol#1503)
- protocol: conditional abort controller cleanup (modelcontextprotocol#1462)
Intentionally kept:
- AuthInfo import from ./shared/auth-info.js (not reverted to auth/types.js)
- All removed transports, auth, and HTTP modules stay out
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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
[v1.x] fix: add missing size field to ResourceSchema - #1575
Merged
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom 
olaservo:fix/resource-schema-size-field-v1x
Mar 26, 2026
Merged
[v1.x] fix: add missing size field to ResourceSchema#1575
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom 
olaservo:fix/resource-schema-size-field-v1x
Conversation
@olaservo
@olaservoolaservo
commented
Feb 22, 2026

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Summary
  • Adds the optional size number field to ResourceSchema in the Zod schema definition, matching the MCP specification (added in spec revision 2025-06-18)
  • The spec defines size?: number on the Resource interface, but the Zod schema was missing it
  • Downstream schemas (ResourceLinkSchema, ListResourcesResultSchema) inherit the field automatically
Backport of #1574 for the v1.x branch.
Fixes#1573
Test plan
  • pnpm typecheck passes (pre-existing unrelated error in test helpers only)
  •  Verified ResourceSchema.shape.size exists after the change
🤖 Generated with Claude Code
@olaservo@claude
fix: add missing size field to ResourceSchema
d9cc4ab
The MCP specification defines an optional `size?: number` field on the
Resource interface (added in spec revision 2025-06-18), but the Zod
schema was missing it. This adds the field so servers can declare
resource sizes and hosts can display file sizes / estimate context
window usage.
Fixesmodelcontextprotocol#1573
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@olaservo
olaservo
requested a review
from a team
as a code ownerFebruary 22, 2026 15:39
@changeset-bot
changeset-botBot
commented
Feb 22, 2026•

edited

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🦋 Changeset detected
Latest commit: fa7221d
The changes in this PR will be included in the next version bump.
Not sure what this means? Click here to learn what changesets are.
Click here if you're a maintainer who wants to add another changeset to this PR
@pkg-pr-new
pkg-pr-newBot
commented
Feb 22, 2026•

edited

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npm i https://pkg.pr.new/@modelcontextprotocol/sdk@1575

commit: fa7221d
@felixweinberger
felixweinberger
enabled auto-merge (squash)
March 26, 2026 16:09
@felixweinberger
felixweinberger
merged commit ddadaa6
into
modelcontextprotocol:v1.xMar 26, 2026

8 checks passed

@felixweinbergerfelixweinberger
mentioned this pull request
Mar 30, 2026
 Merged

9 tasks
olaservo added a commit
to olaservo/skilljack-mcp
that referenced
this pull request
Apr 13, 2026
@olaservo@claude
Add resource size field using MCP SDK 1.29.0
6e4c13b
Bump @modelcontextprotocol/sdk to ^1.29.0 which adds the missing `size`
field to ResourceSchema (modelcontextprotocol/typescript-sdk#1575).
Return file size in bytes on skill resources so clients can estimate
context usage before fetching.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
ContextVM-org added a commit
to ContextVM/mcp-sdk
that referenced
this pull request
Jun 12, 2026
@ContextVM-org
sync: port upstream v1.29.0 fixes
2f0bfa7
Ported functional changes from upstream v1.x (17 commits behind,
v1.28.0 through v1.29.0+). Only retained-fork-surface changes
applied; auth, HTTP, and CI-only commits skipped.
Changes ported:
- stdio: ReadBuffer maxBufferSize limit (modelcontextprotocol#2239)
- stdio: windowsHide always on Win32, removed isElectron() (modelcontextprotocol#1640)
- stdio: try/catch error handling on read buffer overflow
- types: extensions capability on ClientCapabilities/ServerCapabilities (modelcontextprotocol#1811)
- types: size field on ResourceSchema (modelcontextprotocol#1575)
- zod-compat: prioritize zod issues with path formatting (modelcontextprotocol#1503)
- protocol: conditional abort controller cleanup (modelcontextprotocol#1462)
Intentionally kept:
- AuthInfo import from ./shared/auth-info.js (not reverted to auth/types.js)
- All removed transports, auth, and HTTP modules stay out
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2 participants

@olaservo@felixweinberger

, '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
[v1.x] fix: add missing size field to ResourceSchema - #1575
Merged
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom 
olaservo:fix/resource-schema-size-field-v1x
Mar 26, 2026
Merged
[v1.x] fix: add missing size field to ResourceSchema#1575
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom 
olaservo:fix/resource-schema-size-field-v1x
Conversation
@olaservo
@olaservoolaservo
commented
Feb 22, 2026

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Summary
  • Adds the optional size number field to ResourceSchema in the Zod schema definition, matching the MCP specification (added in spec revision 2025-06-18)
  • The spec defines size?: number on the Resource interface, but the Zod schema was missing it
  • Downstream schemas (ResourceLinkSchema, ListResourcesResultSchema) inherit the field automatically
Backport of #1574 for the v1.x branch.
Fixes#1573
Test plan
  • pnpm typecheck passes (pre-existing unrelated error in test helpers only)
  •  Verified ResourceSchema.shape.size exists after the change
🤖 Generated with Claude Code
@olaservo@claude
fix: add missing size field to ResourceSchema
d9cc4ab
The MCP specification defines an optional `size?: number` field on the
Resource interface (added in spec revision 2025-06-18), but the Zod
schema was missing it. This adds the field so servers can declare
resource sizes and hosts can display file sizes / estimate context
window usage.
Fixesmodelcontextprotocol#1573
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@olaservo
olaservo
requested a review
from a team
as a code ownerFebruary 22, 2026 15:39
@changeset-bot
changeset-botBot
commented
Feb 22, 2026•

edited

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🦋 Changeset detected
Latest commit: fa7221d
The changes in this PR will be included in the next version bump.
Not sure what this means? Click here to learn what changesets are.
Click here if you're a maintainer who wants to add another changeset to this PR
@pkg-pr-new
pkg-pr-newBot
commented
Feb 22, 2026•

edited

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npm i https://pkg.pr.new/@modelcontextprotocol/sdk@1575

commit: fa7221d
@felixweinberger
felixweinberger
enabled auto-merge (squash)
March 26, 2026 16:09
@felixweinberger
felixweinberger
merged commit ddadaa6
into
modelcontextprotocol:v1.xMar 26, 2026

8 checks passed

@felixweinbergerfelixweinberger
mentioned this pull request
Mar 30, 2026
 Merged

9 tasks
olaservo added a commit
to olaservo/skilljack-mcp
that referenced
this pull request
Apr 13, 2026
@olaservo@claude
Add resource size field using MCP SDK 1.29.0
6e4c13b
Bump @modelcontextprotocol/sdk to ^1.29.0 which adds the missing `size`
field to ResourceSchema (modelcontextprotocol/typescript-sdk#1575).
Return file size in bytes on skill resources so clients can estimate
context usage before fetching.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
ContextVM-org added a commit
to ContextVM/mcp-sdk
that referenced
this pull request
Jun 12, 2026
@ContextVM-org
sync: port upstream v1.29.0 fixes
2f0bfa7
Ported functional changes from upstream v1.x (17 commits behind,
v1.28.0 through v1.29.0+). Only retained-fork-surface changes
applied; auth, HTTP, and CI-only commits skipped.
Changes ported:
- stdio: ReadBuffer maxBufferSize limit (modelcontextprotocol#2239)
- stdio: windowsHide always on Win32, removed isElectron() (modelcontextprotocol#1640)
- stdio: try/catch error handling on read buffer overflow
- types: extensions capability on ClientCapabilities/ServerCapabilities (modelcontextprotocol#1811)
- types: size field on ResourceSchema (modelcontextprotocol#1575)
- zod-compat: prioritize zod issues with path formatting (modelcontextprotocol#1503)
- protocol: conditional abort controller cleanup (modelcontextprotocol#1462)
Intentionally kept:
- AuthInfo import from ./shared/auth-info.js (not reverted to auth/types.js)
- All removed transports, auth, and HTTP modules stay out
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2 participants

@olaservo@felixweinberger

, '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
[v1.x] fix: add missing size field to ResourceSchema - #1575
Merged
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom 
olaservo:fix/resource-schema-size-field-v1x
Mar 26, 2026
Merged
[v1.x] fix: add missing size field to ResourceSchema#1575
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom 
olaservo:fix/resource-schema-size-field-v1x
Conversation
@olaservo
@olaservoolaservo
commented
Feb 22, 2026

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Summary
  • Adds the optional size number field to ResourceSchema in the Zod schema definition, matching the MCP specification (added in spec revision 2025-06-18)
  • The spec defines size?: number on the Resource interface, but the Zod schema was missing it
  • Downstream schemas (ResourceLinkSchema, ListResourcesResultSchema) inherit the field automatically
Backport of #1574 for the v1.x branch.
Fixes#1573
Test plan
  • pnpm typecheck passes (pre-existing unrelated error in test helpers only)
  •  Verified ResourceSchema.shape.size exists after the change
🤖 Generated with Claude Code
@olaservo@claude
fix: add missing size field to ResourceSchema
d9cc4ab
The MCP specification defines an optional `size?: number` field on the
Resource interface (added in spec revision 2025-06-18), but the Zod
schema was missing it. This adds the field so servers can declare
resource sizes and hosts can display file sizes / estimate context
window usage.
Fixesmodelcontextprotocol#1573
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@olaservo
olaservo
requested a review
from a team
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Latest commit: fa7221d
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npm i https://pkg.pr.new/@modelcontextprotocol/sdk@1575

commit: fa7221d
@felixweinberger
felixweinberger
enabled auto-merge (squash)
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@felixweinberger
felixweinberger
merged commit ddadaa6
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modelcontextprotocol:v1.xMar 26, 2026

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olaservo added a commit
to olaservo/skilljack-mcp
that referenced
this pull request
Apr 13, 2026
@olaservo@claude
Add resource size field using MCP SDK 1.29.0
6e4c13b
Bump @modelcontextprotocol/sdk to ^1.29.0 which adds the missing `size`
field to ResourceSchema (modelcontextprotocol/typescript-sdk#1575).
Return file size in bytes on skill resources so clients can estimate
context usage before fetching.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
ContextVM-org added a commit
to ContextVM/mcp-sdk
that referenced
this pull request
Jun 12, 2026
@ContextVM-org
sync: port upstream v1.29.0 fixes
2f0bfa7
Ported functional changes from upstream v1.x (17 commits behind,
v1.28.0 through v1.29.0+). Only retained-fork-surface changes
applied; auth, HTTP, and CI-only commits skipped.
Changes ported:
- stdio: ReadBuffer maxBufferSize limit (modelcontextprotocol#2239)
- stdio: windowsHide always on Win32, removed isElectron() (modelcontextprotocol#1640)
- stdio: try/catch error handling on read buffer overflow
- types: extensions capability on ClientCapabilities/ServerCapabilities (modelcontextprotocol#1811)
- types: size field on ResourceSchema (modelcontextprotocol#1575)
- zod-compat: prioritize zod issues with path formatting (modelcontextprotocol#1503)
- protocol: conditional abort controller cleanup (modelcontextprotocol#1462)
Intentionally kept:
- AuthInfo import from ./shared/auth-info.js (not reverted to auth/types.js)
- All removed transports, auth, and HTTP modules stay out
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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
[v1.x] fix: add missing size field to ResourceSchema - #1575
Merged
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom 
olaservo:fix/resource-schema-size-field-v1x
Mar 26, 2026
Merged
[v1.x] fix: add missing size field to ResourceSchema#1575
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom 
olaservo:fix/resource-schema-size-field-v1x
Conversation
@olaservo
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Feb 22, 2026

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Summary
  • Adds the optional size number field to ResourceSchema in the Zod schema definition, matching the MCP specification (added in spec revision 2025-06-18)
  • The spec defines size?: number on the Resource interface, but the Zod schema was missing it
  • Downstream schemas (ResourceLinkSchema, ListResourcesResultSchema) inherit the field automatically
Backport of #1574 for the v1.x branch.
Fixes#1573
Test plan
  • pnpm typecheck passes (pre-existing unrelated error in test helpers only)
  •  Verified ResourceSchema.shape.size exists after the change
🤖 Generated with Claude Code
@olaservo@claude
fix: add missing size field to ResourceSchema
d9cc4ab
The MCP specification defines an optional `size?: number` field on the
Resource interface (added in spec revision 2025-06-18), but the Zod
schema was missing it. This adds the field so servers can declare
resource sizes and hosts can display file sizes / estimate context
window usage.
Fixesmodelcontextprotocol#1573
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@olaservo
olaservo
requested a review
from a team
as a code ownerFebruary 22, 2026 15:39
@changeset-bot
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Feb 22, 2026•

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🦋 Changeset detected
Latest commit: fa7221d
The changes in this PR will be included in the next version bump.
Not sure what this means? Click here to learn what changesets are.
Click here if you're a maintainer who wants to add another changeset to this PR
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Feb 22, 2026•

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npm i https://pkg.pr.new/@modelcontextprotocol/sdk@1575

commit: fa7221d
@felixweinberger
felixweinberger
enabled auto-merge (squash)
March 26, 2026 16:09
@felixweinberger
felixweinberger
merged commit ddadaa6
into
modelcontextprotocol:v1.xMar 26, 2026

8 checks passed

@felixweinbergerfelixweinberger
mentioned this pull request
Mar 30, 2026
 Merged

9 tasks
olaservo added a commit
to olaservo/skilljack-mcp
that referenced
this pull request
Apr 13, 2026
@olaservo@claude
Add resource size field using MCP SDK 1.29.0
6e4c13b
Bump @modelcontextprotocol/sdk to ^1.29.0 which adds the missing `size`
field to ResourceSchema (modelcontextprotocol/typescript-sdk#1575).
Return file size in bytes on skill resources so clients can estimate
context usage before fetching.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
ContextVM-org added a commit
to ContextVM/mcp-sdk
that referenced
this pull request
Jun 12, 2026
@ContextVM-org
sync: port upstream v1.29.0 fixes
2f0bfa7
Ported functional changes from upstream v1.x (17 commits behind,
v1.28.0 through v1.29.0+). Only retained-fork-surface changes
applied; auth, HTTP, and CI-only commits skipped.
Changes ported:
- stdio: ReadBuffer maxBufferSize limit (modelcontextprotocol#2239)
- stdio: windowsHide always on Win32, removed isElectron() (modelcontextprotocol#1640)
- stdio: try/catch error handling on read buffer overflow
- types: extensions capability on ClientCapabilities/ServerCapabilities (modelcontextprotocol#1811)
- types: size field on ResourceSchema (modelcontextprotocol#1575)
- zod-compat: prioritize zod issues with path formatting (modelcontextprotocol#1503)
- protocol: conditional abort controller cleanup (modelcontextprotocol#1462)
Intentionally kept:
- AuthInfo import from ./shared/auth-info.js (not reverted to auth/types.js)
- All removed transports, auth, and HTTP modules stay out
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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
[v1.x] fix: add missing size field to ResourceSchema - #1575
Merged
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom 
olaservo:fix/resource-schema-size-field-v1x
Mar 26, 2026
Merged
[v1.x] fix: add missing size field to ResourceSchema#1575
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom 
olaservo:fix/resource-schema-size-field-v1x
Conversation
@olaservo
@olaservoolaservo
commented
Feb 22, 2026

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Summary
  • Adds the optional size number field to ResourceSchema in the Zod schema definition, matching the MCP specification (added in spec revision 2025-06-18)
  • The spec defines size?: number on the Resource interface, but the Zod schema was missing it
  • Downstream schemas (ResourceLinkSchema, ListResourcesResultSchema) inherit the field automatically
Backport of #1574 for the v1.x branch.
Fixes#1573
Test plan
  • pnpm typecheck passes (pre-existing unrelated error in test helpers only)
  •  Verified ResourceSchema.shape.size exists after the change
🤖 Generated with Claude Code
@olaservo@claude
fix: add missing size field to ResourceSchema
d9cc4ab
The MCP specification defines an optional `size?: number` field on the
Resource interface (added in spec revision 2025-06-18), but the Zod
schema was missing it. This adds the field so servers can declare
resource sizes and hosts can display file sizes / estimate context
window usage.
Fixesmodelcontextprotocol#1573
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@olaservo
olaservo
requested a review
from a team
as a code ownerFebruary 22, 2026 15:39
@changeset-bot
changeset-botBot
commented
Feb 22, 2026•

edited

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🦋 Changeset detected
Latest commit: fa7221d
The changes in this PR will be included in the next version bump.
Not sure what this means? Click here to learn what changesets are.
Click here if you're a maintainer who wants to add another changeset to this PR
@pkg-pr-new
pkg-pr-newBot
commented
Feb 22, 2026•

edited

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npm i https://pkg.pr.new/@modelcontextprotocol/sdk@1575

commit: fa7221d
@felixweinberger
felixweinberger
enabled auto-merge (squash)
March 26, 2026 16:09
@felixweinberger
felixweinberger
merged commit ddadaa6
into
modelcontextprotocol:v1.xMar 26, 2026

8 checks passed

@felixweinbergerfelixweinberger
mentioned this pull request
Mar 30, 2026
 Merged

9 tasks
olaservo added a commit
to olaservo/skilljack-mcp
that referenced
this pull request
Apr 13, 2026
@olaservo@claude
Add resource size field using MCP SDK 1.29.0
6e4c13b
Bump @modelcontextprotocol/sdk to ^1.29.0 which adds the missing `size`
field to ResourceSchema (modelcontextprotocol/typescript-sdk#1575).
Return file size in bytes on skill resources so clients can estimate
context usage before fetching.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
ContextVM-org added a commit
to ContextVM/mcp-sdk
that referenced
this pull request
Jun 12, 2026
@ContextVM-org
sync: port upstream v1.29.0 fixes
2f0bfa7
Ported functional changes from upstream v1.x (17 commits behind,
v1.28.0 through v1.29.0+). Only retained-fork-surface changes
applied; auth, HTTP, and CI-only commits skipped.
Changes ported:
- stdio: ReadBuffer maxBufferSize limit (modelcontextprotocol#2239)
- stdio: windowsHide always on Win32, removed isElectron() (modelcontextprotocol#1640)
- stdio: try/catch error handling on read buffer overflow
- types: extensions capability on ClientCapabilities/ServerCapabilities (modelcontextprotocol#1811)
- types: size field on ResourceSchema (modelcontextprotocol#1575)
- zod-compat: prioritize zod issues with path formatting (modelcontextprotocol#1503)
- protocol: conditional abort controller cleanup (modelcontextprotocol#1462)
Intentionally kept:
- AuthInfo import from ./shared/auth-info.js (not reverted to auth/types.js)
- All removed transports, auth, and HTTP modules stay out
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@olaservo@felixweinberger

, '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
[v1.x] fix: add missing size field to ResourceSchema - #1575
Merged
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom 
olaservo:fix/resource-schema-size-field-v1x
Mar 26, 2026
Merged
[v1.x] fix: add missing size field to ResourceSchema#1575
felixweinberger merged 2 commits into
modelcontextprotocol:v1.xfrom 
olaservo:fix/resource-schema-size-field-v1x
Conversation
@olaservo
@olaservoolaservo
commented
Feb 22, 2026

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Summary
  • Adds the optional size number field to ResourceSchema in the Zod schema definition, matching the MCP specification (added in spec revision 2025-06-18)
  • The spec defines size?: number on the Resource interface, but the Zod schema was missing it
  • Downstream schemas (ResourceLinkSchema, ListResourcesResultSchema) inherit the field automatically
Backport of #1574 for the v1.x branch.
Fixes#1573
Test plan
  • pnpm typecheck passes (pre-existing unrelated error in test helpers only)
  •  Verified ResourceSchema.shape.size exists after the change
🤖 Generated with Claude Code
@olaservo@claude
fix: add missing size field to ResourceSchema
d9cc4ab
The MCP specification defines an optional `size?: number` field on the
Resource interface (added in spec revision 2025-06-18), but the Zod
schema was missing it. This adds the field so servers can declare
resource sizes and hosts can display file sizes / estimate context
window usage.
Fixesmodelcontextprotocol#1573
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@olaservo
olaservo
requested a review
from a team
as a code ownerFebruary 22, 2026 15:39
@changeset-bot
changeset-botBot
commented
Feb 22, 2026•

edited

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🦋 Changeset detected
Latest commit: fa7221d
The changes in this PR will be included in the next version bump.
Not sure what this means? Click here to learn what changesets are.
Click here if you're a maintainer who wants to add another changeset to this PR
@pkg-pr-new
pkg-pr-newBot
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Feb 22, 2026•

edited

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npm i https://pkg.pr.new/@modelcontextprotocol/sdk@1575

commit: fa7221d
@felixweinberger
felixweinberger
enabled auto-merge (squash)
March 26, 2026 16:09
@felixweinberger
felixweinberger
merged commit ddadaa6
into
modelcontextprotocol:v1.xMar 26, 2026

8 checks passed

@felixweinbergerfelixweinberger
mentioned this pull request
Mar 30, 2026
 Merged

9 tasks
olaservo added a commit
to olaservo/skilljack-mcp
that referenced
this pull request
Apr 13, 2026
@olaservo@claude
Add resource size field using MCP SDK 1.29.0
6e4c13b
Bump @modelcontextprotocol/sdk to ^1.29.0 which adds the missing `size`
field to ResourceSchema (modelcontextprotocol/typescript-sdk#1575).
Return file size in bytes on skill resources so clients can estimate
context usage before fetching.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
ContextVM-org added a commit
to ContextVM/mcp-sdk
that referenced
this pull request
Jun 12, 2026
@ContextVM-org
sync: port upstream v1.29.0 fixes
2f0bfa7
Ported functional changes from upstream v1.x (17 commits behind,
v1.28.0 through v1.29.0+). Only retained-fork-surface changes
applied; auth, HTTP, and CI-only commits skipped.
Changes ported:
- stdio: ReadBuffer maxBufferSize limit (modelcontextprotocol#2239)
- stdio: windowsHide always on Win32, removed isElectron() (modelcontextprotocol#1640)
- stdio: try/catch error handling on read buffer overflow
- types: extensions capability on ClientCapabilities/ServerCapabilities (modelcontextprotocol#1811)
- types: size field on ResourceSchema (modelcontextprotocol#1575)
- zod-compat: prioritize zod issues with path formatting (modelcontextprotocol#1503)
- protocol: conditional abort controller cleanup (modelcontextprotocol#1462)
Intentionally kept:
- AuthInfo import from ./shared/auth-info.js (not reverted to auth/types.js)
- All removed transports, auth, and HTTP modules stay out
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@felixweinbergerfelixweinbergerfelixweinberger approved these changes

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2 participants

@olaservo@felixweinberger