Add a Windows implementation of StdioTransport - #280

Open
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom
onetamer:windows-stdio-transport
Open

Add a Windows implementation of StdioTransport#280
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom
onetamer:windows-stdio-transport

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@onetamer

@onetameronetamer commented Aug 29, 2026

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Problem

StdioTransport is gated on canImport(Darwin) || canImport(Glibc) || canImport(Musl) — it drives stdin/stdout through POSIX non-blocking file-descriptor I/O (fcntl/O_NONBLOCK) — so it compiles out on Windows and the SDK offers no stdio transport there. Windows is where stdio matters most right now: Claude Desktop's claude_desktop_config.json validates stdio (command) entries only.

Approach

An #elseif os(Windows) arm of the same file provides a public actor StdioTransport: Transport speaking the same wire contract — newline-delimited JSON-RPC frames on standard input/output — over Foundation's FileHandle, which Windows Foundation implements:

  • Reads run on a dedicated OS thread (Thread.detachNewThread), so a blocking stdin read never parks a cooperative-pool thread. Lines split on LF; a trailing CR is stripped in case a Windows-side client writes CRLF.
  • Sends append the LF delimiter and write synchronously; write failures surface as MCPError.transportError.
  • EOF on stdin finishes the message stream, matching the POSIX implementation.

The public surface matches the POSIX actor (connect/disconnect/send/receive + logger), minus the FileDescriptor-typed initializer parameters, which have no Windows equivalent — the Windows initializer takes only the optional Logger.

Verification

  • swift build on macOS: green (the POSIX arm is untouched; the Windows arm is inactive).
  • On Windows 11 ARM64 (Swift 6.3.3): this implementation is extracted nearly verbatim from a production MCP server (CopyBucket's copybucket-mcp.exe, shipping since 2.0.2) where it runs the stdio loop under real agent clients — Claude Desktop and Codex CLI — including initialize, tools/list, and tool calls with multi-hundred-KB results.

Notes

@onetamer
Add a Windows implementation of StdioTransport
5bdcb69
StdioTransport is gated on canImport(Darwin) || canImport(Glibc) ||
canImport(Musl) — it drives standard input/output through POSIX
non-blocking file-descriptor I/O — so it compiles out on Windows and
the SDK offers no stdio transport there.
This adds an os(Windows) arm speaking the same wire contract
(newline-delimited JSON-RPC frames on stdin/stdout) over Foundation's
FileHandle, which Windows Foundation implements:
- Reads run on a dedicated OS thread so a blocking stdin read never
parks a cooperative-pool thread; lines are split on LF with a
trailing CR stripped in case a Windows-side client writes CRLF.
- Sends append the LF delimiter and write synchronously; write
failures surface as MCPError.transportError.
- EOF on stdin finishes the message stream, matching the POSIX
implementation's behavior.
The public surface matches the POSIX actor (connect/disconnect/
send/receive + logger), minus the FileDescriptor-typed initializer
parameters, which have no Windows equivalent.
Extracted from a production MCP server (CopyBucket) where this
implementation runs the stdio loop under real agent clients on
Windows 11.
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@onetamer
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} 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
Add a Windows implementation of StdioTransport - #280
Open
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom 
onetamer:windows-stdio-transport
Open
Add a Windows implementation of StdioTransport#280
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom 
onetamer:windows-stdio-transport
Conversation
@onetamer
@onetameronetamer
commented
Aug 29, 2026

Copy link


Copy Markdown

Problem
StdioTransport is gated on canImport(Darwin) || canImport(Glibc) || canImport(Musl) — it drives stdin/stdout through POSIX non-blocking file-descriptor I/O (fcntl/O_NONBLOCK) — so it compiles out on Windows and the SDK offers no stdio transport there. Windows is where stdio matters most right now: Claude Desktop's claude_desktop_config.json validates stdio (command) entries only.
Approach
An #elseif os(Windows) arm of the same file provides a public actor StdioTransport: Transport speaking the same wire contract — newline-delimited JSON-RPC frames on standard input/output — over Foundation's FileHandle, which Windows Foundation implements:
  • Reads run on a dedicated OS thread (Thread.detachNewThread), so a blocking stdin read never parks a cooperative-pool thread. Lines split on LF; a trailing CR is stripped in case a Windows-side client writes CRLF.
  • Sends append the LF delimiter and write synchronously; write failures surface as MCPError.transportError.
  • EOF on stdin finishes the message stream, matching the POSIX implementation.
The public surface matches the POSIX actor (connect/disconnect/send/receive + logger), minus the FileDescriptor-typed initializer parameters, which have no Windows equivalent — the Windows initializer takes only the optional Logger.
Verification
  • swift build on macOS: green (the POSIX arm is untouched; the Windows arm is inactive).
  • On Windows 11 ARM64 (Swift 6.3.3): this implementation is extracted nearly verbatim from a production MCP server (CopyBucket's copybucket-mcp.exe, shipping since 2.0.2) where it runs the stdio loop under real agent clients — Claude Desktop and Codex CLI — including initialize, tools/list, and tool calls with multi-hundred-KB results.
Notes
@onetamer
Add a Windows implementation of StdioTransport
5bdcb69
StdioTransport is gated on canImport(Darwin) || canImport(Glibc) ||
canImport(Musl) — it drives standard input/output through POSIX
non-blocking file-descriptor I/O — so it compiles out on Windows and
the SDK offers no stdio transport there.
This adds an os(Windows) arm speaking the same wire contract
(newline-delimited JSON-RPC frames on stdin/stdout) over Foundation's
FileHandle, which Windows Foundation implements:
- Reads run on a dedicated OS thread so a blocking stdin read never
parks a cooperative-pool thread; lines are split on LF with a
trailing CR stripped in case a Windows-side client writes CRLF.
- Sends append the LF delimiter and write synchronously; write
failures surface as MCPError.transportError.
- EOF on stdin finishes the message stream, matching the POSIX
implementation's behavior.
The public surface matches the POSIX actor (connect/disconnect/
send/receive + logger), minus the FileDescriptor-typed initializer
parameters, which have no Windows equivalent.
Extracted from a production MCP server (CopyBucket) where this
implementation runs the stdio loop under real agent clients on
Windows 11.
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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
Add a Windows implementation of StdioTransport - #280
Open
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom 
onetamer:windows-stdio-transport
Open
Add a Windows implementation of StdioTransport#280
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom 
onetamer:windows-stdio-transport
Conversation
@onetamer
@onetameronetamer
commented
Aug 29, 2026

Copy link


Copy Markdown

Problem
StdioTransport is gated on canImport(Darwin) || canImport(Glibc) || canImport(Musl) — it drives stdin/stdout through POSIX non-blocking file-descriptor I/O (fcntl/O_NONBLOCK) — so it compiles out on Windows and the SDK offers no stdio transport there. Windows is where stdio matters most right now: Claude Desktop's claude_desktop_config.json validates stdio (command) entries only.
Approach
An #elseif os(Windows) arm of the same file provides a public actor StdioTransport: Transport speaking the same wire contract — newline-delimited JSON-RPC frames on standard input/output — over Foundation's FileHandle, which Windows Foundation implements:
  • Reads run on a dedicated OS thread (Thread.detachNewThread), so a blocking stdin read never parks a cooperative-pool thread. Lines split on LF; a trailing CR is stripped in case a Windows-side client writes CRLF.
  • Sends append the LF delimiter and write synchronously; write failures surface as MCPError.transportError.
  • EOF on stdin finishes the message stream, matching the POSIX implementation.
The public surface matches the POSIX actor (connect/disconnect/send/receive + logger), minus the FileDescriptor-typed initializer parameters, which have no Windows equivalent — the Windows initializer takes only the optional Logger.
Verification
  • swift build on macOS: green (the POSIX arm is untouched; the Windows arm is inactive).
  • On Windows 11 ARM64 (Swift 6.3.3): this implementation is extracted nearly verbatim from a production MCP server (CopyBucket's copybucket-mcp.exe, shipping since 2.0.2) where it runs the stdio loop under real agent clients — Claude Desktop and Codex CLI — including initialize, tools/list, and tool calls with multi-hundred-KB results.
Notes
@onetamer
Add a Windows implementation of StdioTransport
5bdcb69
StdioTransport is gated on canImport(Darwin) || canImport(Glibc) ||
canImport(Musl) — it drives standard input/output through POSIX
non-blocking file-descriptor I/O — so it compiles out on Windows and
the SDK offers no stdio transport there.
This adds an os(Windows) arm speaking the same wire contract
(newline-delimited JSON-RPC frames on stdin/stdout) over Foundation's
FileHandle, which Windows Foundation implements:
- Reads run on a dedicated OS thread so a blocking stdin read never
parks a cooperative-pool thread; lines are split on LF with a
trailing CR stripped in case a Windows-side client writes CRLF.
- Sends append the LF delimiter and write synchronously; write
failures surface as MCPError.transportError.
- EOF on stdin finishes the message stream, matching the POSIX
implementation's behavior.
The public surface matches the POSIX actor (connect/disconnect/
send/receive + logger), minus the FileDescriptor-typed initializer
parameters, which have no Windows equivalent.
Extracted from a production MCP server (CopyBucket) where this
implementation runs the stdio loop under real agent clients on
Windows 11.
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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
Add a Windows implementation of StdioTransport - #280
Open
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom 
onetamer:windows-stdio-transport
Open
Add a Windows implementation of StdioTransport#280
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom 
onetamer:windows-stdio-transport
Conversation
@onetamer
@onetameronetamer
commented
Aug 29, 2026

Copy link


Copy Markdown

Problem
StdioTransport is gated on canImport(Darwin) || canImport(Glibc) || canImport(Musl) — it drives stdin/stdout through POSIX non-blocking file-descriptor I/O (fcntl/O_NONBLOCK) — so it compiles out on Windows and the SDK offers no stdio transport there. Windows is where stdio matters most right now: Claude Desktop's claude_desktop_config.json validates stdio (command) entries only.
Approach
An #elseif os(Windows) arm of the same file provides a public actor StdioTransport: Transport speaking the same wire contract — newline-delimited JSON-RPC frames on standard input/output — over Foundation's FileHandle, which Windows Foundation implements:
  • Reads run on a dedicated OS thread (Thread.detachNewThread), so a blocking stdin read never parks a cooperative-pool thread. Lines split on LF; a trailing CR is stripped in case a Windows-side client writes CRLF.
  • Sends append the LF delimiter and write synchronously; write failures surface as MCPError.transportError.
  • EOF on stdin finishes the message stream, matching the POSIX implementation.
The public surface matches the POSIX actor (connect/disconnect/send/receive + logger), minus the FileDescriptor-typed initializer parameters, which have no Windows equivalent — the Windows initializer takes only the optional Logger.
Verification
  • swift build on macOS: green (the POSIX arm is untouched; the Windows arm is inactive).
  • On Windows 11 ARM64 (Swift 6.3.3): this implementation is extracted nearly verbatim from a production MCP server (CopyBucket's copybucket-mcp.exe, shipping since 2.0.2) where it runs the stdio loop under real agent clients — Claude Desktop and Codex CLI — including initialize, tools/list, and tool calls with multi-hundred-KB results.
Notes
@onetamer
Add a Windows implementation of StdioTransport
5bdcb69
StdioTransport is gated on canImport(Darwin) || canImport(Glibc) ||
canImport(Musl) — it drives standard input/output through POSIX
non-blocking file-descriptor I/O — so it compiles out on Windows and
the SDK offers no stdio transport there.
This adds an os(Windows) arm speaking the same wire contract
(newline-delimited JSON-RPC frames on stdin/stdout) over Foundation's
FileHandle, which Windows Foundation implements:
- Reads run on a dedicated OS thread so a blocking stdin read never
parks a cooperative-pool thread; lines are split on LF with a
trailing CR stripped in case a Windows-side client writes CRLF.
- Sends append the LF delimiter and write synchronously; write
failures surface as MCPError.transportError.
- EOF on stdin finishes the message stream, matching the POSIX
implementation's behavior.
The public surface matches the POSIX actor (connect/disconnect/
send/receive + logger), minus the FileDescriptor-typed initializer
parameters, which have no Windows equivalent.
Extracted from a production MCP server (CopyBucket) where this
implementation runs the stdio loop under real agent clients on
Windows 11.
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Development

Successfully merging this pull request may close these issues.

1 participant

@onetamer

, '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
Add a Windows implementation of StdioTransport - #280
Open
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom 
onetamer:windows-stdio-transport
Open
Add a Windows implementation of StdioTransport#280
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom 
onetamer:windows-stdio-transport
Conversation
@onetamer
@onetameronetamer
commented
Aug 29, 2026

Copy link


Copy Markdown

Problem
StdioTransport is gated on canImport(Darwin) || canImport(Glibc) || canImport(Musl) — it drives stdin/stdout through POSIX non-blocking file-descriptor I/O (fcntl/O_NONBLOCK) — so it compiles out on Windows and the SDK offers no stdio transport there. Windows is where stdio matters most right now: Claude Desktop's claude_desktop_config.json validates stdio (command) entries only.
Approach
An #elseif os(Windows) arm of the same file provides a public actor StdioTransport: Transport speaking the same wire contract — newline-delimited JSON-RPC frames on standard input/output — over Foundation's FileHandle, which Windows Foundation implements:
  • Reads run on a dedicated OS thread (Thread.detachNewThread), so a blocking stdin read never parks a cooperative-pool thread. Lines split on LF; a trailing CR is stripped in case a Windows-side client writes CRLF.
  • Sends append the LF delimiter and write synchronously; write failures surface as MCPError.transportError.
  • EOF on stdin finishes the message stream, matching the POSIX implementation.
The public surface matches the POSIX actor (connect/disconnect/send/receive + logger), minus the FileDescriptor-typed initializer parameters, which have no Windows equivalent — the Windows initializer takes only the optional Logger.
Verification
  • swift build on macOS: green (the POSIX arm is untouched; the Windows arm is inactive).
  • On Windows 11 ARM64 (Swift 6.3.3): this implementation is extracted nearly verbatim from a production MCP server (CopyBucket's copybucket-mcp.exe, shipping since 2.0.2) where it runs the stdio loop under real agent clients — Claude Desktop and Codex CLI — including initialize, tools/list, and tool calls with multi-hundred-KB results.
Notes
@onetamer
Add a Windows implementation of StdioTransport
5bdcb69
StdioTransport is gated on canImport(Darwin) || canImport(Glibc) ||
canImport(Musl) — it drives standard input/output through POSIX
non-blocking file-descriptor I/O — so it compiles out on Windows and
the SDK offers no stdio transport there.
This adds an os(Windows) arm speaking the same wire contract
(newline-delimited JSON-RPC frames on stdin/stdout) over Foundation's
FileHandle, which Windows Foundation implements:
- Reads run on a dedicated OS thread so a blocking stdin read never
parks a cooperative-pool thread; lines are split on LF with a
trailing CR stripped in case a Windows-side client writes CRLF.
- Sends append the LF delimiter and write synchronously; write
failures surface as MCPError.transportError.
- EOF on stdin finishes the message stream, matching the POSIX
implementation's behavior.
The public surface matches the POSIX actor (connect/disconnect/
send/receive + logger), minus the FileDescriptor-typed initializer
parameters, which have no Windows equivalent.
Extracted from a production MCP server (CopyBucket) where this
implementation runs the stdio loop under real agent clients on
Windows 11.
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Reviewers


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Development

Successfully merging this pull request may close these issues.

1 participant

@onetamer

, '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
Add a Windows implementation of StdioTransport - #280
Open
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom 
onetamer:windows-stdio-transport
Open
Add a Windows implementation of StdioTransport#280
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom 
onetamer:windows-stdio-transport
Conversation
@onetamer
@onetameronetamer
commented
Aug 29, 2026

Copy link


Copy Markdown

Problem
StdioTransport is gated on canImport(Darwin) || canImport(Glibc) || canImport(Musl) — it drives stdin/stdout through POSIX non-blocking file-descriptor I/O (fcntl/O_NONBLOCK) — so it compiles out on Windows and the SDK offers no stdio transport there. Windows is where stdio matters most right now: Claude Desktop's claude_desktop_config.json validates stdio (command) entries only.
Approach
An #elseif os(Windows) arm of the same file provides a public actor StdioTransport: Transport speaking the same wire contract — newline-delimited JSON-RPC frames on standard input/output — over Foundation's FileHandle, which Windows Foundation implements:
  • Reads run on a dedicated OS thread (Thread.detachNewThread), so a blocking stdin read never parks a cooperative-pool thread. Lines split on LF; a trailing CR is stripped in case a Windows-side client writes CRLF.
  • Sends append the LF delimiter and write synchronously; write failures surface as MCPError.transportError.
  • EOF on stdin finishes the message stream, matching the POSIX implementation.
The public surface matches the POSIX actor (connect/disconnect/send/receive + logger), minus the FileDescriptor-typed initializer parameters, which have no Windows equivalent — the Windows initializer takes only the optional Logger.
Verification
  • swift build on macOS: green (the POSIX arm is untouched; the Windows arm is inactive).
  • On Windows 11 ARM64 (Swift 6.3.3): this implementation is extracted nearly verbatim from a production MCP server (CopyBucket's copybucket-mcp.exe, shipping since 2.0.2) where it runs the stdio loop under real agent clients — Claude Desktop and Codex CLI — including initialize, tools/list, and tool calls with multi-hundred-KB results.
Notes
@onetamer
Add a Windows implementation of StdioTransport
5bdcb69
StdioTransport is gated on canImport(Darwin) || canImport(Glibc) ||
canImport(Musl) — it drives standard input/output through POSIX
non-blocking file-descriptor I/O — so it compiles out on Windows and
the SDK offers no stdio transport there.
This adds an os(Windows) arm speaking the same wire contract
(newline-delimited JSON-RPC frames on stdin/stdout) over Foundation's
FileHandle, which Windows Foundation implements:
- Reads run on a dedicated OS thread so a blocking stdin read never
parks a cooperative-pool thread; lines are split on LF with a
trailing CR stripped in case a Windows-side client writes CRLF.
- Sends append the LF delimiter and write synchronously; write
failures surface as MCPError.transportError.
- EOF on stdin finishes the message stream, matching the POSIX
implementation's behavior.
The public surface matches the POSIX actor (connect/disconnect/
send/receive + logger), minus the FileDescriptor-typed initializer
parameters, which have no Windows equivalent.
Extracted from a production MCP server (CopyBucket) where this
implementation runs the stdio loop under real agent clients on
Windows 11.
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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('^' + ".*" + '

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Add a Windows implementation of StdioTransport - #280
Open
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom 
onetamer:windows-stdio-transport
Open
Add a Windows implementation of StdioTransport#280
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom 
onetamer:windows-stdio-transport
Conversation
@onetamer
@onetameronetamer
commented
Aug 29, 2026

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Problem
StdioTransport is gated on canImport(Darwin) || canImport(Glibc) || canImport(Musl) — it drives stdin/stdout through POSIX non-blocking file-descriptor I/O (fcntl/O_NONBLOCK) — so it compiles out on Windows and the SDK offers no stdio transport there. Windows is where stdio matters most right now: Claude Desktop's claude_desktop_config.json validates stdio (command) entries only.
Approach
An #elseif os(Windows) arm of the same file provides a public actor StdioTransport: Transport speaking the same wire contract — newline-delimited JSON-RPC frames on standard input/output — over Foundation's FileHandle, which Windows Foundation implements:
  • Reads run on a dedicated OS thread (Thread.detachNewThread), so a blocking stdin read never parks a cooperative-pool thread. Lines split on LF; a trailing CR is stripped in case a Windows-side client writes CRLF.
  • Sends append the LF delimiter and write synchronously; write failures surface as MCPError.transportError.
  • EOF on stdin finishes the message stream, matching the POSIX implementation.
The public surface matches the POSIX actor (connect/disconnect/send/receive + logger), minus the FileDescriptor-typed initializer parameters, which have no Windows equivalent — the Windows initializer takes only the optional Logger.
Verification
  • swift build on macOS: green (the POSIX arm is untouched; the Windows arm is inactive).
  • On Windows 11 ARM64 (Swift 6.3.3): this implementation is extracted nearly verbatim from a production MCP server (CopyBucket's copybucket-mcp.exe, shipping since 2.0.2) where it runs the stdio loop under real agent clients — Claude Desktop and Codex CLI — including initialize, tools/list, and tool calls with multi-hundred-KB results.
Notes
@onetamer
Add a Windows implementation of StdioTransport
5bdcb69
StdioTransport is gated on canImport(Darwin) || canImport(Glibc) ||
canImport(Musl) — it drives standard input/output through POSIX
non-blocking file-descriptor I/O — so it compiles out on Windows and
the SDK offers no stdio transport there.
This adds an os(Windows) arm speaking the same wire contract
(newline-delimited JSON-RPC frames on stdin/stdout) over Foundation's
FileHandle, which Windows Foundation implements:
- Reads run on a dedicated OS thread so a blocking stdin read never
parks a cooperative-pool thread; lines are split on LF with a
trailing CR stripped in case a Windows-side client writes CRLF.
- Sends append the LF delimiter and write synchronously; write
failures surface as MCPError.transportError.
- EOF on stdin finishes the message stream, matching the POSIX
implementation's behavior.
The public surface matches the POSIX actor (connect/disconnect/
send/receive + logger), minus the FileDescriptor-typed initializer
parameters, which have no Windows equivalent.
Extracted from a production MCP server (CopyBucket) where this
implementation runs the stdio loop under real agent clients on
Windows 11.
Sign up for freeto join this conversation on GitHub.
Already have an account?
Sign in to comment

Reviewers


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No one assigned


Labels


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Development

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1 participant

@onetamer

, '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
Add a Windows implementation of StdioTransport - #280
Open
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom 
onetamer:windows-stdio-transport
Open
Add a Windows implementation of StdioTransport#280
onetamer wants to merge 1 commit into
modelcontextprotocol:mainfrom 
onetamer:windows-stdio-transport
Conversation
@onetamer
@onetameronetamer
commented
Aug 29, 2026

Copy link


Copy Markdown

Problem
StdioTransport is gated on canImport(Darwin) || canImport(Glibc) || canImport(Musl) — it drives stdin/stdout through POSIX non-blocking file-descriptor I/O (fcntl/O_NONBLOCK) — so it compiles out on Windows and the SDK offers no stdio transport there. Windows is where stdio matters most right now: Claude Desktop's claude_desktop_config.json validates stdio (command) entries only.
Approach
An #elseif os(Windows) arm of the same file provides a public actor StdioTransport: Transport speaking the same wire contract — newline-delimited JSON-RPC frames on standard input/output — over Foundation's FileHandle, which Windows Foundation implements:
  • Reads run on a dedicated OS thread (Thread.detachNewThread), so a blocking stdin read never parks a cooperative-pool thread. Lines split on LF; a trailing CR is stripped in case a Windows-side client writes CRLF.
  • Sends append the LF delimiter and write synchronously; write failures surface as MCPError.transportError.
  • EOF on stdin finishes the message stream, matching the POSIX implementation.
The public surface matches the POSIX actor (connect/disconnect/send/receive + logger), minus the FileDescriptor-typed initializer parameters, which have no Windows equivalent — the Windows initializer takes only the optional Logger.
Verification
  • swift build on macOS: green (the POSIX arm is untouched; the Windows arm is inactive).
  • On Windows 11 ARM64 (Swift 6.3.3): this implementation is extracted nearly verbatim from a production MCP server (CopyBucket's copybucket-mcp.exe, shipping since 2.0.2) where it runs the stdio loop under real agent clients — Claude Desktop and Codex CLI — including initialize, tools/list, and tool calls with multi-hundred-KB results.
Notes
@onetamer
Add a Windows implementation of StdioTransport
5bdcb69
StdioTransport is gated on canImport(Darwin) || canImport(Glibc) ||
canImport(Musl) — it drives standard input/output through POSIX
non-blocking file-descriptor I/O — so it compiles out on Windows and
the SDK offers no stdio transport there.
This adds an os(Windows) arm speaking the same wire contract
(newline-delimited JSON-RPC frames on stdin/stdout) over Foundation's
FileHandle, which Windows Foundation implements:
- Reads run on a dedicated OS thread so a blocking stdin read never
parks a cooperative-pool thread; lines are split on LF with a
trailing CR stripped in case a Windows-side client writes CRLF.
- Sends append the LF delimiter and write synchronously; write
failures surface as MCPError.transportError.
- EOF on stdin finishes the message stream, matching the POSIX
implementation's behavior.
The public surface matches the POSIX actor (connect/disconnect/
send/receive + logger), minus the FileDescriptor-typed initializer
parameters, which have no Windows equivalent.
Extracted from a production MCP server (CopyBucket) where this
implementation runs the stdio loop under real agent clients on
Windows 11.
Sign up for freeto join this conversation on GitHub.
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1 participant

@onetamer