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docs: sync sep-2549 traceability with spec PR #2890 (#349)

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Updates SEP-2549 caching traceability text to match
modelcontextprotocol/modelcontextprotocol#2890:

- Scope the five *-caching-hints requirements to results with
  resultType: "complete" (interim input_required results carry no
  hints).
- Add two excluded client MUST NOT rows from the new Cache Key
  section (cache-key mismatch, multi round-trip retry results).
  Neither is wire-observable since a conformant client may simply
  never cache.

No check IDs change; traceability.json will be refreshed by the
scheduled traceability workflow.

Claude-Session: https://claude.ai/code/session_01Gbqx5LodtAghT5fRYFxeja
This commit is contained in:
Peter Alexander 2026-06-23 18:33:21 +01:00 • committed by GitHub
commit 1ff5d88370
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1 changed files with 9 additions and 5 deletions
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14
src/seps/sep-2549.yaml
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@ -2,15 +2,15 @@ sep: 2549
spec_url: https://modelcontextprotocol.io/specification/draft/server/utilities/caching
requirements:
- check: sep-2549-tools-list-caching-hints
text: 'Servers MUST include caching hints on results returned by tools/list'
text: 'Servers MUST include caching hints on results with resultType: "complete" returned by tools/list'
- check: sep-2549-prompts-list-caching-hints
text: 'Servers MUST include caching hints on results returned by prompts/list'
text: 'Servers MUST include caching hints on results with resultType: "complete" returned by prompts/list'
- check: sep-2549-resources-list-caching-hints
text: 'Servers MUST include caching hints on results returned by resources/list'
text: 'Servers MUST include caching hints on results with resultType: "complete" returned by resources/list'
- check: sep-2549-resources-templates-list-caching-hints
text: 'Servers MUST include caching hints on results returned by resources/templates/list'
text: 'Servers MUST include caching hints on results with resultType: "complete" returned by resources/templates/list'
- check: sep-2549-resources-read-caching-hints
text: 'Servers MUST include caching hints on results returned by resources/read'
text: 'Servers MUST include caching hints on results with resultType: "complete" returned by resources/read'
- check: sep-2549-ttl-non-negative
text: 'Servers MUST provide a ttlMs value that is >= 0'
- check: sep-2549-cache-scope-valid
@ -42,3 +42,7 @@ requirements:
excluded: 'Server-side awareness requirement; implementation guidance not testable via protocol messages'
- text: 'Server implementors MUST apply appropriate per-primitive access controls, and MUST NOT rely on cacheScope alone to prevent unauthorized access to primitives.'
excluded: 'Server-side access control; implementation guidance not testable via protocol messages'
- text: 'Clients MUST NOT serve a cached response for a request whose method or parameters differ from the request that produced it.'
excluded: 'Client-side caching behavior; not observable at the protocol level'
- text: 'Results produced by retrying a request through the multi round-trip requests mechanism (requests carrying inputResponses or requestState) MUST NOT be cached.'
excluded: 'Client-side caching behavior; not observable at the protocol level'