### Completed Milestones ### Current Work ### Active Work Items
The whole hunk
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lines
from line 15
1515which raised open questions about whether existing MCP primitives suffice or what
1616conventions to standardize. The WG produces specification extensions, reference
1717implementations, and coordination artifacts because solutions touch the protocol spec,
18registry schema, SDK implementations, and client behavior. The WG's current direction
19is captured in [SEP-2640 — Skills Extension](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2640)
20(Resources-based, Extensions Track).
18registry schema, SDK implementations, and client behavior.
2119
20[SEP-2640 — Skills Extension](/seps/2640-skills-extension) is Final. The WG maintains
21the official [Skills extension](/extensions/skills/overview)
22(`io.modelcontextprotocol/skills`) in
23[modelcontextprotocol/ext-skills](https://github.com/modelcontextprotocol/ext-skills).
24Current work focuses on implementation support, interoperability, and evolution
25of the published extension.
26
2227## Scope
2328
2429### In Scope
2530
26* **Specification Work**: SEPs defining how skills are represented, discovered, and
27 consumed within MCP — including the Skills Extension (Extensions Track) and related
28 protocol changes
31* **Specification Work**: Maintain and evolve the Skills extension, with changes
32 tracked in the [decision log](https://github.com/modelcontextprotocol/ext-skills/blob/main/docs/decisions.md);
33 propose related core protocol changes through the SEP process
2934* **Reference Implementations**: SDK components and reference servers demonstrating
3035 skill discovery and consumption patterns
3136* **Cross-Cutting Concerns**: Coordination with Registry WG (skills discovery/distribution,
3237 registry schema changes), Agents WG (skill activation, server metadata consumption),
33 Primitive Grouping WG (progressive disclosure patterns), and external projects including
38 Primitive Grouping IG (progressive disclosure patterns), and external projects including
3439 the [Agent Skills](https://agentskills.io/) spec (content format and well-known URI
3540 discovery), FastMCP, and PydanticAI
3641* **Documentation**: Specification sections and guidance covering skill authoring,
from line 55
5055
5156* **Agents WG** — How agents consume server metadata, skill activation
5257* **Registry WG** — Skills discovery/distribution, registry schema changes
53* **Primitive Grouping WG** — Progressive disclosure patterns
58* **Primitive Grouping IG** — Progressive disclosure patterns
5459
5560## Leadership
5661
from line 114
109114
110115## Resources
111116
112* Experimental findings and reference implementations: [modelcontextprotocol/experimental-ext-skills](https://github.com/modelcontextprotocol/experimental-ext-skills)
113* Project board: [Skills Over MCP WG](https://github.com/orgs/modelcontextprotocol/projects/38/views/1)
117* [Skills extension overview](/extensions/skills/overview) and [Final SEP-2640](/seps/2640-skills-extension)
118* Specification and WG documents: [modelcontextprotocol/ext-skills](https://github.com/modelcontextprotocol/ext-skills)
119* [Implementations](https://github.com/modelcontextprotocol/ext-skills/blob/main/docs/implementations.md) and [client support](/extensions/client-matrix)
120* [Decision log](https://github.com/modelcontextprotocol/ext-skills/blob/main/docs/decisions.md) and [archived design work](https://github.com/modelcontextprotocol/ext-skills/tree/main/docs/archive)
114121
115122## Deliverables & Success Metrics
116123
117### Active Work Items
124### Completed Milestones
118125
119Full live tracking is on the [Skills Over MCP WG project board](https://github.com/orgs/modelcontextprotocol/projects/38/views/1). Headline workstreams:
126* [SEP-2640](/seps/2640-skills-extension) is **Final**, merged on September 13, 2026.
127* The official specification is published in [ext-skills](https://github.com/modelcontextprotocol/ext-skills/blob/main/specification/stable/skills.mdx), with a [website overview](/extensions/skills/overview).
128* [Skills conformance scenarios](https://github.com/modelcontextprotocol/conformance/pull/330) were merged on September 11, 2026.
120129
121| Item | Status | Target Date | Champion |
122| ----------------------------------------------------------------------------------------------------------------- | ----------- | ----------- | -------------------------------------------------------------------------------------------- |
123| [Skills Extension SEP](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2640) (Extensions Track) | In Review | | [@pja-ant](https://github.com/pja-ant) |
124| Skills Extension reference implementation | In Review | | [@olaservo](https://github.com/olaservo) |
125| Agent Skills spec coordination | In Progress | | [@jonathanhefner](https://github.com/jonathanhefner), [@pja-ant](https://github.com/pja-ant) |
126| Registry skills.json proposal | In Progress | | [@JAORMX](https://github.com/JAORMX) |
130### Current Work
127131
132Track proposals, implementation work, and coordination in
133[ext-skills issues](https://github.com/modelcontextprotocol/ext-skills/issues),
134with links to SDK or client issues where the implementation lives.
135Owners, progress, and priorities are maintained there rather than in this charter.
136
128137### Success Criteria
129138
130* **Short-term**: Documented consensus on requirements and evaluation of existing approaches
131* **Medium-term**: Clear recommendation (convention vs. protocol extension vs. both) — the draft Skills Extension SEP represents the WG's current direction: a formal extension using existing Resources primitives
132* **Long-term**: Interoperable skill distribution across MCP servers and clients
139* **Specification**: A published Resources-based Skills extension — achieved with Final SEP-2640.
140* **Implementation**: SDK and host implementations that pass the applicable conformance scenarios.
141* **Interoperability**: Independent MCP servers and clients that discover and load skills consistently.
133142
134143## Changelog
135144