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Merge pull request modelcontextprotocol#2662 from modelcontextprotocol/fweinberger/sdk-wg-charter
docs(community): add SDK Working Group charter
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‎docs/community/sdk/charter.mdx‎

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---
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title: SDK Working Group Charter
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description: Charter for the MCP SDK Working Group.
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---
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## Group Type
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**Working Group**
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## Mission Statement
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The SDK Working Group exists to keep the official MCP SDKs consistent, conformant, and current with the specification. It coordinates implementation of new protocol versions across languages, governs the [SDK Tiering System](/community/sdk-tiers), and establishes shared design patterns where sensible, so that developers get a coherent experience across SDKs while each remains idiomatic to its language.
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## Scope
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### In Scope
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- **SDK Tiering**: Operating the [SDK Tiering System](/community/sdk-tiers), including reviewing tier advancement requests, applying relegation criteria, and maintaining the published tier assignments.
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- **Official SDK Roster**: Evaluating proposals to add new official SDKs or retire existing ones.
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- **Release Coordination**: Aligning Tier-1 SDK release plans with specification version dates so that protocol features land in SDKs on the timelines their tier requires.
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- **Cross-SDK Design Guidance**: Recommending common patterns for SDK API surface, versioning, deprecation, error handling, and extension packaging, so that SDKs remain recognisably similar across languages while staying idiomatic.
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- **Conformance Integration**: Working with the Conformance Testing project to ensure each official SDK runs the conformance suite and publishes results.
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- **Maintainer Coordination**: Providing a forum for per-language SDK maintainers to share implementation experience and surface specification ambiguities back to Core Maintainers.
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### Out of Scope
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- **Per-SDK day-to-day maintenance**: Issue triage, PR review, and releases for an individual SDK remain the responsibility of that SDK's maintainers as listed in [MAINTAINERS.md](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/MAINTAINERS.md).
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- **Specification authorship**: Protocol changes are proposed through the [SEP process](/community/sep-guidelines) and owned by the relevant working group or Core Maintainers. The SDK WG implements accepted SEPs; it does not own spec sections.
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- **Conformance test authoring**: The conformance test suite itself is owned by the [Conformance Testing](https://github.com/modelcontextprotocol/conformance) project.
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- **Third-party and community SDKs**: SDKs outside the [modelcontextprotocol](https://github.com/modelcontextprotocol) organization are not governed by this group.
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### Related Groups
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- **Transports WG**: Transport implementations are a substantial part of every SDK. The SDK WG coordinates with the Transports WG on rollout sequencing when transport SEPs land.
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- **Conformance Testing**: Tier assignments depend on conformance scores. The SDK WG consumes conformance results and feeds back gaps in test coverage.
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- **All specification-producing WGs**: The SDK WG is a downstream consumer of accepted SEPs and coordinates reference-implementation timing with the originating group.
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## Leadership
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| Role | Name | Organization | GitHub | Term |
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| ---- | ---------------- | ------------ | ------------------------------------------------------ | ------- |
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| Lead | Felix Weinberger | Anthropic | [@felixweinberger](https://github.com/felixweinberger) | Ongoing |
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## Authority & Decision Rights
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| Decision Type | Authority Level |
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| ---------------------------------------- | ---------------------------------------------- |
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| Meeting logistics & scheduling | WG Leads (autonomous) |
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| Proposal prioritization within WG | WG Leads (autonomous) |
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| SDK tier advancement or relegation | WG consensus |
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| Cross-SDK design guidance | WG consensus (advisory to per-SDK maintainers) |
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| Per-SDK releases, versioning, API design | That SDK's maintainers (autonomous) |
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| Adding or retiring an official SDK | WG consensus → Core Maintainer approval |
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| Changes to the tiering criteria | WG consensus → Core Maintainer approval |
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| Scope expansion | Core Maintainer approval required |
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| WG Member approval | WG Member sponsors |
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## Membership
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WG Members are the maintainers of each official SDK as recorded in [MAINTAINERS.md](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/MAINTAINERS.md) and the corresponding roles in [modelcontextprotocol/access](https://github.com/modelcontextprotocol/access). Maintainers of any official SDK are WG Members by default.
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## Operations
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| Meeting | Frequency | Duration | Purpose |
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| --------------- | --------- | -------- | ---------------------------------------------------- |
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| Working Session | Biweekly | 45 min | Release coordination, tier reviews, cross-SDK design |
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Communication happens in the `#general-sdk-dev` Discord channel and the SDK Working Group category in [GitHub Discussions](https://github.com/modelcontextprotocol/modelcontextprotocol/discussions).
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## Deliverables & Success Metrics
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### Active Work Items
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| Item | Status | Target Date | Champion |
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| --------------------------------------------------- | ----------- | ----------- | ------------------- |
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| 2026-06-30 spec support across Tier-1 SDKs | Planning | 2026 Q3 | Per-SDK maintainers |
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| Cross-SDK guidance for stateless transport adoption | In progress | 2026 Q2 | WG Leads |
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| Quarterly tier review | Recurring | Quarterly | WG Leads |
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### Success Criteria
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- All official SDKs have a published tier and a passing conformance run on their default branch.
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- Tier-1 SDKs ship support for each released specification version within the timeline their tier requires.
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- Tier advancement and relegation decisions are recorded with rationale in GitHub Discussions.
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## Changelog
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| Date | Change |
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| ---------- | --------------- |
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| 2026-04-28 | Initial charter |

‎docs/docs.json‎

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"community/file-uploads/charter",
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"community/inspector-v2/charter",
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"community/interceptors/charter",
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"community/sdk/charter",
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"community/server-card/charter",
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"community/skills-over-mcp/charter",
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"community/triggers-events/charter"

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