test(fastmcp): Wrap prompt in Message

[alexander-alderman-webb]

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

Issues

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

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.}

[github-actions]

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.

Files with missing lines (179)

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---

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[sentrivana]

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