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Add "What the MCP spec left out" under a new Reading section#196

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Add "What the MCP spec left out" under a new Reading section#196
wkoverfield wants to merge 2 commits into
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Adds docs/product/what-the-spec-left-out.md, registered on the docs site under a new Reading section, and links it from the landing delegation card.

The essay covers: what the 2026-07-28 MCP revision standardizes (OAuth 2.1 resource servers, mandatory Protected Resource Metadata and Resource Indicators), the three absences in its core (runtime authorization, sub-agent delegation, audit), the reliability case for bounded delegation, seven invariants with their RFC 8693 mapping, and the honest routed-paths enforcement boundary.

Held as a draft to publish with the 2026-07-28 specification release. Before merge: verify every spec claim against the final published text, since this is written against the release candidate.

Site build verified locally; the page renders at /docs/what-the-spec-left-out.

🤖 Generated with Claude Code

…n card

The essay states what the 2026-07-28 MCP revision standardizes, the three
absences in its core (runtime authorization, sub-agent delegation, audit),
the reliability case for delegation, the seven invariants a delegation layer
needs with their RFC 8693 mapping, and the routed-paths enforcement boundary.
Published under a new Reading section; the landing delegation card links to
it. Publishes with the 2026-07-28 specification release.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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