docs: align Skills corrections with the final SEP and website (#147)

The stable Skills page missed the final SEP's Agent Skills compatibility
clause, and its examples used abbreviated hashes and inconsistent byte
sizes. Archived drafts also retained current-sounding source-of-truth
guidance.

This corrects the stable page directly to match already-established
requirements: restores the compatibility clause, shows the resources
capability and server/discover, explains omitted request metadata, and
makes the example manifests and content consistent. It also labels
archived documents as historical and fixes the SEP domain in AGENTS.md.
This is an editorial alignment, not a new extension proposal; #142
remains separate.

Validation: all JSON examples parsed; all 13 manifest entries checked
against sample bytes for SHA-256 and size; the corrected specification
builds with the VitePress publishing site; git diff --check passed.

AI assistance: prepared with Codex.
This commit is contained in:
Sambhav Kothari 2026-09-16 15:03:49 +02:00 • committed by GitHub
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@ -2,7 +2,7 @@
**IMPORTANT**: The source of truth for the Skills extension (`io.modelcontextprotocol/skills`) is [`specification/stable/skills.mdx`](specification/stable/skills.mdx) in this repository. It is the normative text of the extension, written against base protocol revision `2026-07-28`, and is what the official documentation at [modelcontextprotocol.io/extensions/skills/overview](https://modelcontextprotocol.io/extensions/skills/overview) summarizes.
[SEP-2640](https://modelcontextprotocol.org/seps/2640-skills-extension) is the accepted proposal behind the extension (Status: Final; [PR #2640](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2640) merged 2026-09-13). [`docs/archive/sep-draft-skills-extension.md`](docs/archive/sep-draft-skills-extension.md) is a copy of that SEP text pinned at the commit named in its header, kept so Working Group discussion, meeting notes, and decision records can quote and link stable text. It is a historical baseline, not the current spec.
[SEP-2640](https://modelcontextprotocol.io/seps/2640-skills-extension) is the accepted proposal behind the extension (Status: Final; [PR #2640](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2640) merged 2026-09-13). [`docs/archive/sep-draft-skills-extension.md`](docs/archive/sep-draft-skills-extension.md) is a copy of that SEP text pinned at the commit named in its header, kept so Working Group discussion, meeting notes, and decision records can quote and link stable text. It is a historical baseline, not the current spec.
- **Answer questions about what the extension requires from `specification/stable/skills.mdx`**, not from the SEP copy or the `docs/` folder. Where the spec page and the SEP differ, the [decision log](docs/decisions.md) records why (see the 2026-09-08 entry).
- The `docs/` folder holds design history, rationale, experimental findings, and trackers. Treat it as context, not as normative text.