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felixweinberger merged 2 commits into from
Nov 27, 2025
Merged

Fix JSON parse error on SSE events with empty data #1184

felixweinberger merged 2 commits into from
Nov 27, 2025
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@felixweinberger felixweinberger commented Nov 27, 2025

Priming events for resumability (SEP-1699) have an event ID but empty data. The client was attempting JSON.parse("") which throws "Unexpected end of JSON input".

Motivation and Context

When connecting to a server that supports SSE resumability, the server sends priming events like:

id: 123
data:

The client's SSE handler was only checking for empty data inside the message event type check, but priming events may not have an explicit event type. This caused a JSON parse error on every connection to servers with resumability enabled.

How Has This Been Tested?

  • Added unit test that sends a priming event with empty data followed by a real message
  • Verified no JSON parse error occurs
  • Verified resumption token callback is still invoked for both events
  • All 1130 tests pass

Breaking Changes

None.

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

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 felixweinberger requested a review from a team as a code owner November 27, 2025 19:56
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npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/sdk@1184

commit: a8818ac

@felixweinberger
Fix JSON parse error on SSE events with empty data
f0c6062 
Priming events for resumability (SEP-1699) have an event ID but empty
data. The client was attempting JSON.parse("") which throws "Unexpected
end of JSON input".

Skip processing for all events with empty data, not just message events.
This handles priming events, keep-alives, and any other events that may
have empty data fields.
@felixweinberger felixweinberger force-pushed the fweinberger/fix-empty-sse-data branch from 2ec83ef to f0c6062 Compare November 27, 2025 19:58
@felixweinberger felixweinberger merged commit 9203091 into main Nov 27, 2025
10 checks passed
@felixweinberger felixweinberger deleted the fweinberger/fix-empty-sse-data branch November 27, 2025 21:22
@felixweinberger felixweinberger mentioned this pull request Nov 27, 2025
Merged
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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"
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/pull/944">#944</a></li>
<li><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> made their
first contribution in <a class="issue-link js-issue-link"
data-error-text="Failed to load title" data-id="3669612690"
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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>
    </ul>
from <a
href="https://redirect.github.com/modelcontextprotocol/typescript-sdk/releases">@modelcontextprotocol/sdk
GitHub release notes</a>
  </details>
</details>

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@mattzcarey mattzcarey mattzcarey approved these changes

@maxisbey maxisbey maxisbey approved these changes

@pcarleton pcarleton Awaiting requested review from pcarleton

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