test(conformance): cover SEP-2640 skills server

[tobi-oye]

Summary

Adds SEP-2640 (Skills extension) coverage to the TypeScript SDK's server conformance fixture, so the merged skills scenarios in modelcontextprotocol/conformance#330 run against this SDK.

The conformance server now:

• Advertises the io.modelcontextprotocol/skills extension with directoryRead: true.
• Serves a small, complete skill fixture — a SKILL.md plus one supporting file in a subdirectory, with real SHA-256 digests and byte sizes.
• Implements skills/list, skills/get, and resources/directory/read through the SDK's typed custom request-handler API.
• Returns ttlMs and cacheScope for modern protocol requests (2026-07-28 and later), and omits them on earlier revisions.
• Returns -32602 Invalid params for unknown skill URIs and for non-directory resource requests.

Scope

This is a conformance fixture that demonstrates the existing public SDK APIs. It does not add a new first-class registerSkill API, and it does not change any SDK implementation code. Skill files are registered as ordinary resources via registerResource, and the three SEP-2640 methods are wired with server.setRequestHandler, using the typed { params, result } schema form the SDK already exposes.

All changes are confined to test/conformance/:

File	Change
test/conformance/src/skills.ts	New — the fixture and its three request handlers
test/conformance/src/everythingServer.ts	Declares the extension capability and registers the fixture

Test results

Scenario	Result
SEP-2640 enumeration	32/32 passed
SEP-2640 manifest	6/6 passed
SEP-2640 directory read	7/7 passed
Total SEP-2640	45/45 passed, 0 failures, 0 warnings
2026 active server suite	41/41 passed
Legacy SEP-2640 enumeration	30/30 applicable checks passed; two modern cache checks correctly skipped
Repository pre-push checks	build, typecheck, and lint all passed

The legacy run confirms the cache attributes are correctly version-gated: on the 2025-11-25 lifecycle the two ttlMs/cacheScope checks skip rather than fail.

Terminal output

---

🤖 Generated with Claude Code

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