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test(fastmcp): Wrap prompt in Message#5411

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alexander-alderman-webb merged 2 commits intomasterfrom
webb/fastmcp-use-message-type
Feb 2, 2026
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test(fastmcp): Wrap prompt in Message#5411
alexander-alderman-webb merged 2 commits intomasterfrom
webb/fastmcp-use-message-type

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@alexander-alderman-webb alexander-alderman-webb commented Feb 2, 2026

Description

The following error is returned from result.json() without the change:

{'jsonrpc': '2.0', 'id': 'req-async-prompt', 'error': {'code': 0, 'message': 'Error rendering prompt async_prompt.'}}

I haven't investigated this in much depth, but Cursor fetched me this from the upgrade guide 😄

https://github.com/jlowin/fastmcp/blob/main/docs/development/upgrade-guide.mdx#prompts-use-message-class

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@alexander-alderman-webb alexander-alderman-webb requested a review from a team as a code owner February 2, 2026 13:15
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Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).

New Features ✨

Span Streaming

  • feat(span-streaming): Add spans to telemetry pipeline, add span name and attributes (3) by sentrivana in #5399
  • feat(span-streaming): Add span batcher (2) by sentrivana in #5398
  • feat(span-streaming): Add experimental trace_lifecycle switch (1) by sentrivana in #5397

Bug Fixes 🐛

Span Streaming

  • fix(span-streaming): Always preserialize attributes by sentrivana in #5407
  • fix(span-streaming): Warn about thread usage if any batcher is active by sentrivana in #5408

Other

  • fix(arq): handle settings_cls passed as keyword argument by nc9 in #5393
  • fix(dramatiq): cleanup isolated scope and transaction when message is skipped by frankie567 in #5346
  • fix(google-genai): deactivate google genai when langchain is used by shellmayr in #5389

Internal Changes 🔧

Fastmcp

  • test(fastmcp): Wrap prompt in Message by alexander-alderman-webb in #5411
  • test(fastmcp): Use AsyncClient for SSE by alexander-alderman-webb in #5400
  • test(fastmcp): Use TestClient for Streamable HTTP by alexander-alderman-webb in #5384
  • test(fastmcp): Simulate stdio transport with memory streams by alexander-alderman-webb in #5333

Mcp

  • test(mcp): Use AsyncClient for SSE by alexander-alderman-webb in #5396
  • test(mcp): Use TestClient for Streamable HTTP by alexander-alderman-webb in #5383
  • test(mcp): Remove unused stdio helpers by alexander-alderman-webb in #5409
  • test(mcp): Simulate stdio transport with memory streams by alexander-alderman-webb in #5329

Other

  • ci: migration to the new codecov action by MathurAditya724 in #5392

🤖 This preview updates automatically when you update the PR.

@alexander-alderman-webb alexander-alderman-webb changed the title test(fastmcp): Wrap prompt in Message test(fastmcp): Wrap prompt in Message Feb 2, 2026
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Codecov Results 📊

✅ 118 passed | Total: 118 | Pass Rate: 100% | Execution Time: 18.05s

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 13162 uncovered lines.

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Generated by Codecov Action

@alexander-alderman-webb alexander-alderman-webb marked this pull request as draft February 2, 2026 13:20
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@alexander-alderman-webb alexander-alderman-webb marked this pull request as ready for review February 2, 2026 13:33
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Cursor Bugbot has reviewed your changes and found 1 potential issue.

Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.

sentrivana
sentrivana approved these changes Feb 2, 2026
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🙏🏻

@alexander-alderman-webb alexander-alderman-webb merged commit 3455a42 into master Feb 2, 2026
153 checks passed
@alexander-alderman-webb alexander-alderman-webb deleted the webb/fastmcp-use-message-type branch February 2, 2026 13:42
@sentry-release-bot sentry-release-bot bot mentioned this pull request Feb 4, 2026
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