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Merged
felixweinberger merged 6 commits into from
Dec 1, 2025
Merged

fix: improve SSE reconnection behavior #1191

felixweinberger merged 6 commits into from
Dec 1, 2025
+127 −7

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@felixweinberger
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@felixweinberger felixweinberger commented Nov 28, 2025

Fixes SSE reconnection issues that were causing errors with SEP-1699 usage.

Motivation and Context

When using SSE streaming with SEP-1699 priming events, several issues occurred:

  1. The client would reconnect even after a response was already received
  2. Reconnection timeouts would fire after close() was called, causing "Failed to reconnect SSE stream" errors

How Has This Been Tested?

  • Added unit tests for both fixes
  • Tested with the inspector against a local MCP server

Breaking Changes

None

Types of changes

  • Bug fix (non-breaking change which fixes an issue)

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

@felixweinberger
fix: don't reconnect POST stream when response was already received
52fb100 
Per SEP-1699, the client should only reconnect when the server
disconnects BEFORE sending a response (for long-running operations).
The previous implementation would reconnect after ANY stream completion
when a priming event was received, even when the response was already
delivered.

This fix tracks whether a response was received and skips reconnection
if so. This prevents:
1. Unnecessary network round-trips
2. Race conditions with rapid stream cycling (which caused crashes in
   consumers like the inspector)

Adds test case to verify the correct behavior.
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npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/sdk@1191

commit: 3cd7447

@felixweinberger
fix: cancel pending reconnection timeout on close()
3be665f 
Track the reconnection timeout ID and clear it when close() is called.
This prevents reconnection attempts after the transport is closed,
which was causing "Failed to reconnect SSE stream" errors on disconnect.

Adds test case to verify reconnection is cancelled after close().
@felixweinberger felixweinberger force-pushed the fweinberger/sep1699-debug branch from 37276ea to 3be665f Compare November 28, 2025 18:34
@felixweinberger felixweinberger marked this pull request as ready for review November 28, 2025 19:44
@felixweinberger felixweinberger requested a review from a team as a code owner November 28, 2025 19:44
pcarleton
pcarleton approved these changes Dec 1, 2025
View reviewed changes
src/client/streamableHttp.ts
const message = JSONRPCMessageSchema.parse(JSON.parse(event.data));
if (replayMessageId !== undefined && isJSONRPCResponse(message)) {
message.id = replayMessageId;
if (isJSONRPCResponse(message)) {
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i wasn't sure if this would get triggered by notifications etc. but those would be a different schema, so shouldn't.

@felixweinberger felixweinberger merged commit f67fc2f into main Dec 1, 2025
10 checks passed
@felixweinberger felixweinberger deleted the fweinberger/sep1699-debug branch December 1, 2025 16:31
MightyPrytanis added a commit to MightyPrytanis/codebase that referenced this pull request Jan 3, 2026
@MightyPrytanis
[Snyk] Upgrade @modelcontextprotocol/sdk from 1.24.0 to 1.24.3 (#142)
0714420 
![snyk-top-banner](https://res.cloudinary.com/snyk/image/upload/r-d/scm-platform/snyk-pull-requests/pr-banner-default.svg)


<h3>Snyk has created this PR to upgrade @modelcontextprotocol/sdk from
1.24.0 to 1.24.3.</h3>

:information_source: Keep your dependencies up-to-date. This makes it
easier to fix existing vulnerabilities and to more quickly identify and
fix newly disclosed vulnerabilities when they affect your project.

<hr/>


- The recommended version is **3 versions** ahead of your current
version.

- The recommended version was released **a month ago**.



<details>
<summary><b>Release notes</b></summary>
<br/>
  <details>
    <summary>Package name: <b>@modelcontextprotocol/sdk</b></summary>
    <ul>
      <li>
<b>1.24.3</b> - <a
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.24.3">2025-12-04</a></br><h2>What's
Changed</h2>
<ul>
<li>chore: fix dev dependency security vulnerabilities by <a
class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/felixweinberger/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/felixweinberger">@ felixweinberger</a>
in <a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3691198208" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1227"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1227/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1227">#1227</a></li>
<li>chore(deps): bump express from 5.0.1 to 5.2.1 in the npm_and_yarn
group across 1 directory by <a class="user-mention notranslate"
data-hovercard-type="organization"
data-hovercard-url="/orgs/dependabot/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/dependabot">@ dependabot</a>[bot] in
<a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3691221872" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1228"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1228/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1228">#1228</a></li>
<li>fix: release HTTP connections after POST responses by <a
class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/mattzcarey/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/mattzcarey">@ mattzcarey</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3685626979" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1214"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1214/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1214">#1214</a></li>
<li>fix: skip priming events and closeSSEStream for old protocol
versions by <a class="user-mention notranslate"
data-hovercard-type="user"
data-hovercard-url="/users/felixweinberger/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/felixweinberger">@ felixweinberger</a>
in <a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3694335007" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1233"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1233/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1233">#1233</a></li>
<li>chore: bump version for patch release by <a class="user-mention
notranslate" data-hovercard-type="user"
data-hovercard-url="/users/felixweinberger/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/felixweinberger">@ felixweinberger</a>
in <a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3694887719" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1235"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1235/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1235">#1235</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a class="commit-link"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/compare/1.24.2...1.24.3"><tt>1.24.2...1.24.3</tt></a></p>
      </li>
      <li>
<b>1.24.2</b> - <a
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.24.2">2025-12-03</a></br><h2>What's
Changed</h2>
<ul>
<li>feat: add optional resource annotations by <a class="user-mention
notranslate" data-hovercard-type="user"
data-hovercard-url="/users/vhorvath2010/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/vhorvath2010">@ vhorvath2010</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3436712736" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#954"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/954/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/954">#954</a></li>
<li>chore: refresh CLAUDE.md by <a class="user-mention notranslate"
data-hovercard-type="user"
data-hovercard-url="/users/LucaButBoring/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/LucaButBoring">@ LucaButBoring</a> in
<a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3686867636" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1217"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1217/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1217">#1217</a></li>
<li>refactor: make Server class framework-agnostic by moving express to
separate module by <a class="user-mention notranslate"
data-hovercard-type="user" data-hovercard-url="/users/cytle/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/cytle">@ cytle</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3689485567" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1223"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1223/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1223">#1223</a></li>
<li>chore: bump version to 1.24.2 by <a class="user-mention notranslate"
data-hovercard-type="user"
data-hovercard-url="/users/pcarleton/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/pcarleton">@ pcarleton</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3689937597" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1224"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1224/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1224">#1224</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/vhorvath2010/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/vhorvath2010">@ vhorvath2010</a> made
their first contribution in <a class="issue-link js-issue-link"
data-error-text="Failed to load title" data-id="3436712736"
data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#954"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/954/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/954">#954</a></li>
<li><a class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/cytle/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/cytle">@ cytle</a> made their first
contribution in <a class="issue-link js-issue-link"
data-error-text="Failed to load title" data-id="3689485567"
data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1223"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1223/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1223">#1223</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a class="commit-link"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/compare/1.24.1...1.24.2"><tt>1.24.1...1.24.2</tt></a></p>
      </li>
      <li>
<b>1.24.1</b> - <a
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.24.1">2025-12-02</a></br><h2>What's
Changed</h2>
<ul>
<li>fix(streamableHttp): fix infinite retries when maxRetries is set to
0 by <a class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/mrorigo/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/mrorigo">@ mrorigo</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3686035318" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1216"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1216/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1216">#1216</a></li>
<li>chore: update protocol version to 2025-11-25 by <a
class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/dsp-ant/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/dsp-ant">@ dsp-ant</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3687018759" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1218"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1218/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1218">#1218</a></li>
<li>chore: bump version for release by <a class="user-mention
notranslate" data-hovercard-type="user"
data-hovercard-url="/users/felixweinberger/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/felixweinberger">@ felixweinberger</a>
in <a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3687067916" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1219"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1219/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1219">#1219</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/mrorigo/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/mrorigo">@ mrorigo</a> made their
first contribution in <a class="issue-link js-issue-link"
data-error-text="Failed to load title" data-id="3686035318"
data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1216"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1216/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1216">#1216</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a class="commit-link"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/compare/1.24.0...1.24.1"><tt>1.24.0...1.24.1</tt></a></p>
      </li>
      <li>
<b>1.24.0</b> - <a
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.24.0">2025-12-02</a></br><h2>Summary</h2>
<p>This release brings us up to speed with the latest MCP spec
<code>2025-11-25</code>. Take a look at the <a
href="https://modelcontextprotocol.io/specification/2025-11-25"
rel="nofollow">latest spec</a> as well as the release <a
href="https://blog.modelcontextprotocol.io/posts/2025-11-25-first-mcp-anniversary/"
rel="nofollow">blog post.</a></p>
<h2>What's Changed</h2>
<ul>
<li>fix: update spec links from latest to draft by <a
class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/domdomegg/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/domdomegg">@ domdomegg</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3664829218" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1171"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1171/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1171">#1171</a></li>
<li>Make sure to consume HTTP error response bodies by <a
class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/GreenStage/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/GreenStage">@ GreenStage</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3666874622" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1173"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1173/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1173">#1173</a></li>
<li>docs: add GET request handling for streamableHttp stateless mode by
<a class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/saharis9988/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/saharis9988">@ saharis9988</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3660259155" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1161"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1161/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1161">#1161</a></li>
<li>SEP-1686: Tasks by <a class="user-mention notranslate"
data-hovercard-type="user"
data-hovercard-url="/users/LucaButBoring/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/LucaButBoring">@ LucaButBoring</a> in
<a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3546900542" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1041"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1041/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1041">#1041</a></li>
<li>Fix JSON parse error on SSE events with empty data by <a
class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/felixweinberger/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/felixweinberger">@ felixweinberger</a>
in <a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3672860656" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1184"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1184/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1184">#1184</a></li>
<li>Fix StreamableHTTPClientTransport instantiation by <a
class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/yuwzho/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/yuwzho">@ yuwzho</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3420595607" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#944"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/944/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/944">#944</a></li>
<li>feat: eslint rule to prefer node protocols by <a class="user-mention
notranslate" data-hovercard-type="user"
data-hovercard-url="/users/mattzcarey/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/mattzcarey">@ mattzcarey</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3674518488" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1187"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1187/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1187">#1187</a></li>
<li>fix: call tasks/result to deliver side-channel messages by <a
class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/felixweinberger/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/felixweinberger">@ felixweinberger</a>
in <a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3672896336" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1185"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1185/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1185">#1185</a></li>
<li>Add invalid_target oauth error (rfc 8707) by <a class="user-mention
notranslate" data-hovercard-type="user"
data-hovercard-url="/users/GreenStage/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/GreenStage">@ GreenStage</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3672704149" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1183"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1183/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1183">#1183</a></li>
<li>fix(client): use StreamableHTTPError instead of plain Error in
send() by <a class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/yamadashy/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/yamadashy">@ yamadashy</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3669612690" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1178"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1178/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1178">#1178</a></li>
<li>coerce 'expires_in' to be a number by <a class="user-mention
notranslate" data-hovercard-type="user"
data-hovercard-url="/users/adam-kuhn/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/adam-kuhn">@ adam-kuhn</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3624481815" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1111"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1111/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1111">#1111</a></li>
<li>Allow HTTP issuer URLs when MCP_DEV_MODE is enabled by <a
class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/jerome3o-anthropic/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/jerome3o-anthropic">@
jerome3o-anthropic</a> in <a class="issue-link js-issue-link"
data-error-text="Failed to load title" data-id="3675262314"
data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1189"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1189/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1189">#1189</a></li>
<li>fix: update registerTool signature for proper typed ToolCallback by
<a class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/mattzcarey/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/mattzcarey">@ mattzcarey</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3674832778" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1188"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1188/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1188">#1188</a></li>
<li>SEP-1046: Client credentials flow for M2M without user interaction
by <a class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/KKonstantinov/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/KKonstantinov">@ KKonstantinov</a> in
<a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3655110317" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1157"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1157/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1157">#1157</a></li>
<li>adds the transitive @ types/express-serve-static-core dependency as
a direct devDependency by <a class="user-mention notranslate"
data-hovercard-type="user"
data-hovercard-url="/users/mgyarmathy/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/mgyarmathy">@ mgyarmathy</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3584050696" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1078"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1078/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1078">#1078</a></li>
<li>Fix optional argument handling in prompts for Zod V4 by <a
class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/filip-bartuska-ipf/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/filip-bartuska-ipf">@
filip-bartuska-ipf</a> in <a class="issue-link js-issue-link"
data-error-text="Failed to load title" data-id="3680574535"
data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1199"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1199/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1199">#1199</a></li>
<li>fix hanging stdio servers by <a class="user-mention notranslate"
data-hovercard-type="user"
data-hovercard-url="/users/mattzcarey/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/mattzcarey">@ mattzcarey</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3680985762" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1200"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1200/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1200">#1200</a></li>
<li>README refactor by <a class="user-mention notranslate"
data-hovercard-type="user"
data-hovercard-url="/users/KKonstantinov/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/KKonstantinov">@ KKonstantinov</a> in
<a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3679336733" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1197"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1197/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1197">#1197</a></li>
<li>[Docs] Fix typo by <a class="user-mention notranslate"
data-hovercard-type="user" data-hovercard-url="/users/koic/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/koic">@ koic</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3576912671" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1067"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1067/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1067">#1067</a></li>
<li>feat: add closeSSEStream callback to RequestHandlerExtra by <a
class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/felixweinberger/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/felixweinberger">@ felixweinberger</a>
in <a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3663783141" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1166"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1166/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1166">#1166</a></li>
<li>fix: improve SSE reconnection behavior by <a class="user-mention
notranslate" data-hovercard-type="user"
data-hovercard-url="/users/felixweinberger/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/felixweinberger">@ felixweinberger</a>
in <a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3675644114" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1191"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1191/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1191">#1191</a></li>
<li>fix: normalize headers in sse transport by <a class="user-mention
notranslate" data-hovercard-type="user"
data-hovercard-url="/users/marcrasi/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/marcrasi">@ marcrasi</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3301818827" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#856"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/856/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/856">#856</a></li>
<li>feat: add closeStandaloneSSEStream for GET stream polling by <a
class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/felixweinberger/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/felixweinberger">@ felixweinberger</a>
in <a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3681592788" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1203"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1203/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1203">#1203</a></li>
<li>fix: normalize null to undefined in ElicitResultSchema content field
by <a class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/mattzcarey/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/mattzcarey">@ mattzcarey</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3681871133" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1204"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1204/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1204">#1204</a></li>
<li>Modify Origin header validation in validateRequestHeaders
(streamableHttp.ts and sse.ts) to allow requests without an Origin, as
they are not relevant to server DNS rebinding protection. by <a
class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/jacopoc/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/jacopoc">@ jacopoc</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3682254908" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1205"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1205/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1205">#1205</a></li>
<li>fix: allow zod 4 transformations by <a class="user-mention
notranslate" data-hovercard-type="user"
data-hovercard-url="/users/mattzcarey/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/mattzcarey">@ mattzcarey</a> in <a
class="issue-link js-issue-link" data-error-text="Failed to load title"
data-id="3685521543" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1213"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1213/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1213">#1213</a></li>
<li>feat: backwards-compatible createMessage overloads for SEP-1577 by
<a class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/felixweinberger/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/felixweinberger">@ felixweinberger</a>
in <a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3685389937" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1212"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1212/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1212">#1212</a></li>
<li>chore: bump version for release by <a class="user-mention
notranslate" data-hovercard-type="user"
data-hovercard-url="/users/felixweinberger/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/felixweinberger">@ felixweinberger</a>
in <a class="issue-link js-issue-link" data-error-text="Failed to load
title" data-id="3685838812" data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1215"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1215/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1215">#1215</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/GreenStage/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/GreenStage">@ GreenStage</a> made
their first contribution in <a class="issue-link js-issue-link"
data-error-text="Failed to load title" data-id="3666874622"
data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1173"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1173/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1173">#1173</a></li>
<li><a class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/saharis9988/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/saharis9988">@ saharis9988</a> made
their first contribution in <a class="issue-link js-issue-link"
data-error-text="Failed to load title" data-id="3660259155"
data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#1161"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/1161/hovercard"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/1161">#1161</a></li>
<li><a class="user-mention notranslate" data-hovercard-type="user"
data-hovercard-url="/users/yuwzho/hovercard"
data-octo-click="hovercard-link-click"
data-octo-dimensions="link_type:self"
href="https://redirect.github.com/yuwzho">@ yuwzho</a> made their first
contribution in <a class="issue-link js-issue-link"
data-error-text="Failed to load title" data-id="3420595607"
data-permission-text="Title is private"
data-url="modelcontextprotocol/typescript-sdk#944"
data-hovercard-type="pull_request"
data-hovercard-url="/modelcontextprotocol/typescript-sdk/pull/944/hovercard"
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<p><strong>Full Changelog</strong>: <a class="commit-link"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/compare/1.23.0...1.24.0"><tt>1.23.0...1.24.0</tt></a></p>
      </li>
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from <a
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/releases">@modelcontextprotocol/sdk
GitHub release notes</a>
  </details>
</details>

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