fix(stdio): close server transport on stdin EOF - #1613

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Summary

StdioServerTransport never listened for the end event on stdin. When a client initiates shutdown by closing stdin (step 1 of the MCP spec's stdio shutdown sequence), the server transport didn't detect it. The connection hung in a zombie state until the client escalated to SIGTERM (2 seconds later per StdioClientTransport.close()).

This adds an end listener in start() that calls close() on EOF, and an idempotency guard (_closed flag) to prevent double onclose invocation when explicit close() and stdin EOF race.

Related: #579

@rcdailey
fix(stdio): close transport on stdin EOF
afc81fa
Listen for the stdin "end" event so StdioServerTransport detects
client disconnection as defined in step 1 of the MCP spec's stdio
shutdown sequence.
Previously the transport had no "end" listener, leaving servers
unable to react to stdin closure without waiting for SIGTERM
escalation. A guard flag prevents onclose from firing more than
once when an explicit close() races with a late EOF event.
Tests cover: EOF triggers close, duplicate-close guard, and clean
EOF after a partial message.
@rcdailey
rcdailey requested a review from a team as a code ownerMarch 2, 2026 16:29
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rcdailey deleted the fix/stdio-server-stdin-eof branch March 21, 2026 20:19
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fix(stdio): close server transport on stdin EOF - #1613
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Summary
StdioServerTransport never listened for the end event on stdin. When a client initiates shutdown by closing stdin (step 1 of the MCP spec's stdio shutdown sequence), the server transport didn't detect it. The connection hung in a zombie state until the client escalated to SIGTERM (2 seconds later per StdioClientTransport.close()).
This adds an end listener in start() that calls close() on EOF, and an idempotency guard (_closed flag) to prevent double onclose invocation when explicit close() and stdin EOF race.
Related: #579
@rcdailey
fix(stdio): close transport on stdin EOF
afc81fa
Listen for the stdin "end" event so StdioServerTransport detects
client disconnection as defined in step 1 of the MCP spec's stdio
shutdown sequence.
Previously the transport had no "end" listener, leaving servers
unable to react to stdin closure without waiting for SIGTERM
escalation. A guard flag prevents onclose from firing more than
once when an explicit close() races with a late EOF event.
Tests cover: EOF triggers close, duplicate-close guard, and clean
EOF after a partial message.
@rcdailey
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The changes in this PR will be included in the next version bump.
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, 'i');
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var style = document.createElement('style');
style.textContent = '
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color-scheme: dark light;
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})();
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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fix(stdio): close server transport on stdin EOF - #1613
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Summary
StdioServerTransport never listened for the end event on stdin. When a client initiates shutdown by closing stdin (step 1 of the MCP spec's stdio shutdown sequence), the server transport didn't detect it. The connection hung in a zombie state until the client escalated to SIGTERM (2 seconds later per StdioClientTransport.close()).
This adds an end listener in start() that calls close() on EOF, and an idempotency guard (_closed flag) to prevent double onclose invocation when explicit close() and stdin EOF race.
Related: #579
@rcdailey
fix(stdio): close transport on stdin EOF
afc81fa
Listen for the stdin "end" event so StdioServerTransport detects
client disconnection as defined in step 1 of the MCP spec's stdio
shutdown sequence.
Previously the transport had no "end" listener, leaving servers
unable to react to stdin closure without waiting for SIGTERM
escalation. A guard flag prevents onclose from firing more than
once when an explicit close() races with a late EOF event.
Tests cover: EOF triggers close, duplicate-close guard, and clean
EOF after a partial message.
@rcdailey
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🦋 Changeset detected
Latest commit: afc81fa
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 4 packages
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@modelcontextprotocol/expressPatch
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
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} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
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fix(stdio): close server transport on stdin EOF - #1613
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Summary
StdioServerTransport never listened for the end event on stdin. When a client initiates shutdown by closing stdin (step 1 of the MCP spec's stdio shutdown sequence), the server transport didn't detect it. The connection hung in a zombie state until the client escalated to SIGTERM (2 seconds later per StdioClientTransport.close()).
This adds an end listener in start() that calls close() on EOF, and an idempotency guard (_closed flag) to prevent double onclose invocation when explicit close() and stdin EOF race.
Related: #579
@rcdailey
fix(stdio): close transport on stdin EOF
afc81fa
Listen for the stdin "end" event so StdioServerTransport detects
client disconnection as defined in step 1 of the MCP spec's stdio
shutdown sequence.
Previously the transport had no "end" listener, leaving servers
unable to react to stdin closure without waiting for SIGTERM
escalation. A guard flag prevents onclose from firing more than
once when an explicit close() races with a late EOF event.
Tests cover: EOF triggers close, duplicate-close guard, and clean
EOF after a partial message.
@rcdailey
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@modelcontextprotocol/express
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Latest commit: afc81fa
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 4 packages
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@modelcontextprotocol/expressPatch
@modelcontextprotocol/honoPatch
@modelcontextprotocol/nodePatch
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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, 'i');
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'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
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var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
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var __m = "youtube.com";
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fix(stdio): close server transport on stdin EOF - #1613
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Summary
StdioServerTransport never listened for the end event on stdin. When a client initiates shutdown by closing stdin (step 1 of the MCP spec's stdio shutdown sequence), the server transport didn't detect it. The connection hung in a zombie state until the client escalated to SIGTERM (2 seconds later per StdioClientTransport.close()).
This adds an end listener in start() that calls close() on EOF, and an idempotency guard (_closed flag) to prevent double onclose invocation when explicit close() and stdin EOF race.
Related: #579
@rcdailey
fix(stdio): close transport on stdin EOF
afc81fa
Listen for the stdin "end" event so StdioServerTransport detects
client disconnection as defined in step 1 of the MCP spec's stdio
shutdown sequence.
Previously the transport had no "end" listener, leaving servers
unable to react to stdin closure without waiting for SIGTERM
escalation. A guard flag prevents onclose from firing more than
once when an explicit close() races with a late EOF event.
Tests cover: EOF triggers close, duplicate-close guard, and clean
EOF after a partial message.
@rcdailey
rcdailey
requested a review
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as a code ownerMarch 2, 2026 16:29
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Latest commit: afc81fa
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 4 packages
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@modelcontextprotocol/expressPatch
@modelcontextprotocol/honoPatch
@modelcontextprotocol/nodePatch
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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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
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lastUrl = location.href;
setTimeout(tryTheater, 500);
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observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
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Summary
StdioServerTransport never listened for the end event on stdin. When a client initiates shutdown by closing stdin (step 1 of the MCP spec's stdio shutdown sequence), the server transport didn't detect it. The connection hung in a zombie state until the client escalated to SIGTERM (2 seconds later per StdioClientTransport.close()).
This adds an end listener in start() that calls close() on EOF, and an idempotency guard (_closed flag) to prevent double onclose invocation when explicit close() and stdin EOF race.
Related: #579
@rcdailey
fix(stdio): close transport on stdin EOF
afc81fa
Listen for the stdin "end" event so StdioServerTransport detects
client disconnection as defined in step 1 of the MCP spec's stdio
shutdown sequence.
Previously the transport had no "end" listener, leaving servers
unable to react to stdin closure without waiting for SIGTERM
escalation. A guard flag prevents onclose from firing more than
once when an explicit close() races with a late EOF event.
Tests cover: EOF triggers close, duplicate-close guard, and clean
EOF after a partial message.
@rcdailey
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as a code ownerMarch 2, 2026 16:29
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🦋 Changeset detected
Latest commit: afc81fa
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 4 packages
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@modelcontextprotocol/serverPatch
@modelcontextprotocol/expressPatch
@modelcontextprotocol/honoPatch
@modelcontextprotocol/nodePatch
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fix(stdio): close server transport on stdin EOF - #1613
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rcdailey:fix/stdio-server-stdin-eof
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fix(stdio): close server transport on stdin EOF#1613
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rcdailey:fix/stdio-server-stdin-eof
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Summary
StdioServerTransport never listened for the end event on stdin. When a client initiates shutdown by closing stdin (step 1 of the MCP spec's stdio shutdown sequence), the server transport didn't detect it. The connection hung in a zombie state until the client escalated to SIGTERM (2 seconds later per StdioClientTransport.close()).
This adds an end listener in start() that calls close() on EOF, and an idempotency guard (_closed flag) to prevent double onclose invocation when explicit close() and stdin EOF race.
Related: #579
@rcdailey
fix(stdio): close transport on stdin EOF
afc81fa
Listen for the stdin "end" event so StdioServerTransport detects
client disconnection as defined in step 1 of the MCP spec's stdio
shutdown sequence.
Previously the transport had no "end" listener, leaving servers
unable to react to stdin closure without waiting for SIGTERM
escalation. A guard flag prevents onclose from firing more than
once when an explicit close() races with a late EOF event.
Tests cover: EOF triggers close, duplicate-close guard, and clean
EOF after a partial message.
@rcdailey
rcdailey
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as a code ownerMarch 2, 2026 16:29
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@modelcontextprotocol/express
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/express@1613

@modelcontextprotocol/hono
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/hono@1613

@modelcontextprotocol/node
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/node@1613

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🦋 Changeset detected
Latest commit: afc81fa
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 4 packages
NameType
@modelcontextprotocol/serverPatch
@modelcontextprotocol/expressPatch
@modelcontextprotocol/honoPatch
@modelcontextprotocol/nodePatch
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
@rcdailey
rcdailey
deleted the

fix/stdio-server-stdin-eof

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March 21, 2026 20:19

This was referenced May 1, 2026

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Skip to content
fix(stdio): close server transport on stdin EOF - #1613
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rcdailey wants to merge 1 commit into
modelcontextprotocol:mainfrom 
rcdailey:fix/stdio-server-stdin-eof
Closed
fix(stdio): close server transport on stdin EOF#1613
rcdailey wants to merge 1 commit into
modelcontextprotocol:mainfrom 
rcdailey:fix/stdio-server-stdin-eof
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@rcdailey
@rcdaileyrcdailey
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Mar 2, 2026

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Summary
StdioServerTransport never listened for the end event on stdin. When a client initiates shutdown by closing stdin (step 1 of the MCP spec's stdio shutdown sequence), the server transport didn't detect it. The connection hung in a zombie state until the client escalated to SIGTERM (2 seconds later per StdioClientTransport.close()).
This adds an end listener in start() that calls close() on EOF, and an idempotency guard (_closed flag) to prevent double onclose invocation when explicit close() and stdin EOF race.
Related: #579
@rcdailey
fix(stdio): close transport on stdin EOF
afc81fa
Listen for the stdin "end" event so StdioServerTransport detects
client disconnection as defined in step 1 of the MCP spec's stdio
shutdown sequence.
Previously the transport had no "end" listener, leaving servers
unable to react to stdin closure without waiting for SIGTERM
escalation. A guard flag prevents onclose from firing more than
once when an explicit close() races with a late EOF event.
Tests cover: EOF triggers close, duplicate-close guard, and clean
EOF after a partial message.
@rcdailey
rcdailey
requested a review
from a team
as a code ownerMarch 2, 2026 16:29
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@modelcontextprotocol/client
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/client@1613

@modelcontextprotocol/server
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/server@1613

@modelcontextprotocol/express
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/express@1613

@modelcontextprotocol/hono
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/hono@1613

@modelcontextprotocol/node
npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/node@1613

commit: 1123a69
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🦋 Changeset detected
Latest commit: afc81fa
The changes in this PR will be included in the next version bump.
This PR includes changesets to release 4 packages
NameType
@modelcontextprotocol/serverPatch
@modelcontextprotocol/expressPatch
@modelcontextprotocol/honoPatch
@modelcontextprotocol/nodePatch
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
@rcdailey
rcdailey
deleted the

fix/stdio-server-stdin-eof

branch
March 21, 2026 20:19

This was referenced May 1, 2026

Open

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