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.
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Sambhav Kothari
GitHub
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1 changed files with 92 additions and 48 deletions
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@ -30,14 +30,17 @@ This extension is identified as: `io.modelcontextprotocol/skills`.
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This page specifies the extension against base protocol revision `2026-07-28` or later. Type names it references without defining (`Result`, `PaginatedRequest`, `PaginatedResult`, `CacheableResult`, `Resource`, `Cursor`) are those of the base schema at that revision.
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For brevity, request examples omit `_meta`. Every request **MUST** include the required [request metadata](https://modelcontextprotocol.io/specification/2026-07-28/basic/index#_meta).
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## Capability Negotiation
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Servers declare support for this extension in the `extensions` field of their capabilities:
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Servers declare support for this extension in the `extensions` field of their capabilities in `server/discover`:
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```jsonc
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// Server capabilities
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{
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"capabilities": {
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"resources": {},
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// Other capabilities...
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"extensions": {
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"io.modelcontextprotocol/skills": {
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@ -72,7 +75,7 @@ A skill served over MCP **MUST** conform to the [Agent Skills specification](htt
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- `SKILL.md` **MUST** begin with YAML frontmatter containing at minimum the `name` and `description` fields as defined by the Agent Skills specification.
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- A skill **MAY** contain additional files and subdirectories (references, scripts, examples, assets).
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This extension does not redefine, constrain, or extend the skill format. Future revisions of the Agent Skills specification apply automatically.
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This extension does not redefine, constrain, or extend the skill format. Future revisions of the Agent Skills specification apply automatically. In the event that the Agent Skills specification changes in a backwards incompatible way, clients **MUST** honor any backwards compatibility mechanisms provided by the Agent Skills specification and **SHOULD** continue to support the Agent Skills specification as it existed prior to any incompatible change.
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## Resource Mapping
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@ -282,8 +285,8 @@ interface ListSkillsResult extends PaginatedResult, CacheableResult {
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"resources": [
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{
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"uri": "skill://git-workflow/SKILL.md",
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"digest": "sha256:a1b2c3d4...",
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"size": 2314
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"digest": "sha256:b95a384300adeea2d902f7d19cd7c04b378ef58e09759107b9c7db4dcacbaa25",
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"size": 190
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}
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]
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},
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@ -297,13 +300,13 @@ interface ListSkillsResult extends PaginatedResult, CacheableResult {
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"resources": [
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{
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"uri": "skill://acme/billing/refunds/SKILL.md",
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"digest": "sha256:b2c3d4e5...",
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"size": 3871
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"digest": "sha256:ae7bc7e45f44a6381977ef1f772cbad6e38d8ec78903ea7b87abb373815a8f89",
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"size": 175
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},
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{
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"uri": "skill://acme/billing/refunds/examples/email.md",
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"digest": "sha256:c3d4e5f6...",
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"size": 962
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"digest": "sha256:a724fa5ed3b9e39c0e731fe1f0e866eb46d23969af25ecf0d5f41982e3e36bea",
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"size": 58
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}
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]
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},
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@ -378,39 +381,23 @@ interface GetSkillResult extends CacheableResult {
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"uri": "skill://pdf-processing/SKILL.md",
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"frontmatter": {
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"name": "pdf-processing",
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"description": "Extract, fill, and assemble PDF documents",
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"metadata": { "version": "2.1.0" }
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"description": "Extract, fill, and assemble PDF documents"
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},
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"resources": [
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{
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"uri": "skill://pdf-processing/SKILL.md",
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"digest": "sha256:d5e6f7a8...",
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"size": 5120
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},
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{
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"uri": "skill://pdf-processing/references/FORMS.md",
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"digest": "sha256:e6f7a8b9...",
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"size": 18433
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},
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{
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"uri": "skill://pdf-processing/scripts/extract.py",
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"digest": "sha256:f7a8b9c0...",
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"size": 4096
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"digest": "sha256:99b737495721155ece826d57521e2d66141ebdc1344a400487481ea2642ab19e",
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"size": 151
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},
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{
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"uri": "skill://pdf-processing/templates/invoice.md",
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"digest": "sha256:a8b9c0d1...",
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"size": 1210
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"digest": "sha256:61f4ea6d2c75fde1b4977219e7e3107d491c3c26aefb6686e84d6281c088d9ee",
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"size": 29
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},
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{
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"uri": "skill://pdf-processing/templates/purchase-order.md",
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"digest": "sha256:b9c0d1e2...",
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"size": 1388
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},
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{
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"uri": "skill://pdf-processing/templates/regional/eu-invoice.md",
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"digest": "sha256:c0d1e2f3...",
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"size": 1472
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"digest": "sha256:f2ff774b1737ff3dec81c47946f9976f18a1a9f69dda0a81f22eabd95173c158",
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"size": 35
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}
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]
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},
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@ -613,18 +600,18 @@ Consider a host connected to a server it labels `docs-server`, which declares th
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"resources": [
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{
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"uri": "skill://pdf-processing/SKILL.md",
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"digest": "sha256:d5e6f7a8...",
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"size": 5120
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"digest": "sha256:99b737495721155ece826d57521e2d66141ebdc1344a400487481ea2642ab19e",
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"size": 151
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},
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{
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"uri": "skill://pdf-processing/templates/invoice.md",
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"digest": "sha256:a8b9c0d1...",
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"size": 1210
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"digest": "sha256:61f4ea6d2c75fde1b4977219e7e3107d491c3c26aefb6686e84d6281c088d9ee",
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"size": 29
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},
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{
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"uri": "skill://pdf-processing/templates/purchase-order.md",
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"digest": "sha256:b9c0d1e2...",
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"size": 1388
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"digest": "sha256:f2ff774b1737ff3dec81c47946f9976f18a1a9f69dda0a81f22eabd95173c158",
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"size": 35
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}
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]
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}
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@ -635,6 +622,26 @@ Consider a host connected to a server it labels `docs-server`, which declares th
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}
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```
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The supporting files in this example contain the following UTF-8 text, each ending with a newline. Their sizes and SHA-256 digests match the manifest above.
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`invoice.md`:
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```markdown
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# Invoice
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Customer:
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Amount:
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```
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`purchase-order.md`:
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```markdown
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# Purchase order
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Supplier:
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Items:
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```
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The host records the entry under the identity (`docs-server`, `skill://pdf-processing/SKILL.md`), surfaces the skill's name, description, and origin to the model and the user, and fetches nothing further.
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Later the model asks to load the skill. The host obtains user approval, binding it to the three `{uri, digest}` pairs above, then reads `SKILL.md` from `docs-server`:
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@ -660,7 +667,7 @@ Later the model asks to load the skill. The host obtains user approval, binding
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{
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"uri": "skill://pdf-processing/SKILL.md",
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"mimeType": "text/markdown",
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"text": "---\nname: pdf-processing\ndescription: Extract, fill, and assemble PDF documents\n---\n\n# PDF processing\n\nChoose the matching template from `templates/` ..."
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"text": "---\nname: pdf-processing\ndescription: Extract, fill, and assemble PDF documents\n---\n\n# PDF processing\n\nChoose the matching template from `templates/`.\n"
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}
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],
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"ttlMs": 300000,
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@ -669,7 +676,7 @@ Later the model asks to load the skill. The host obtains user approval, binding
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}
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```
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The host checks that the content is 5120 bytes and hashes to `sha256:d5e6f7a8...`, parses the frontmatter and confirms it equals the entry's `frontmatter`, then places the content in the model's context tagged as originating from `docs-server`. The host is now acting on the skill and holds this entry.
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The host checks that the content is 151 bytes and matches the manifest's SHA-256 digest, parses the frontmatter and confirms it equals the entry's `frontmatter`, then places the content in the model's context tagged as originating from `docs-server`. The host is now acting on the skill and holds this entry.
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The instructions reference `templates/`. The model lists the directory, and the host routes this to `docs-server`:
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@ -713,6 +720,15 @@ The instructions reference `templates/`. The model lists the directory, and the
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`credit-note.md` is not in the held entry's `resources`, because the server added it after the listing. The host does not surface it as a file of the skill and would treat a read of it as a verification failure. The model reads `invoice.md`, which is listed. The host issues `resources/read`, verifies size and digest against the held entry, and returns the content.
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The newly added `credit-note.md` contains this UTF-8 text, ending with a newline:
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```markdown
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# Credit note
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Invoice:
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Credit amount:
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```
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To make `credit-note.md` available, the host refreshes the entry:
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```json
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@ -741,23 +757,23 @@ To make `credit-note.md` available, the host refreshes the entry:
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"resources": [
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{
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"uri": "skill://pdf-processing/SKILL.md",
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"digest": "sha256:d5e6f7a8...",
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"size": 5120
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"digest": "sha256:99b737495721155ece826d57521e2d66141ebdc1344a400487481ea2642ab19e",
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"size": 151
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},
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{
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"uri": "skill://pdf-processing/templates/invoice.md",
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"digest": "sha256:a8b9c0d1...",
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"size": 1210
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"digest": "sha256:61f4ea6d2c75fde1b4977219e7e3107d491c3c26aefb6686e84d6281c088d9ee",
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"size": 29
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},
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{
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"uri": "skill://pdf-processing/templates/purchase-order.md",
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"digest": "sha256:b9c0d1e2...",
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"size": 1388
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"digest": "sha256:f2ff774b1737ff3dec81c47946f9976f18a1a9f69dda0a81f22eabd95173c158",
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"size": 35
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},
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{
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"uri": "skill://pdf-processing/templates/credit-note.md",
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"digest": "sha256:e2f3a4b5...",
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"size": 1104
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"digest": "sha256:766bffa8d4908ce897e1727ca22e4bf0fa796620b35218ce2132a124545626f1",
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"size": 39
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}
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]
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},
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