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Add a pluggable server extension API with MCP Apps (#3003)

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Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>
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Marcelo Trylesinski 2026-06-29 11:58:05 +02:00 • committed by GitHub
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examples/stories/tasks/README.md
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# tasks
The `io.modelcontextprotocol/tasks` extension: long-running work registered
with `@task`, polled via `tasks/get`, updated mid-flight, and cancelled with
`tasks/cancel`. The story will show a task that outlives the request that
started it.
Task-augmented execution: a requestor augments a `tools/call` with a `task`, the
receiver returns a `CreateTaskResult` immediately, and the requestor polls
`tasks/get` and retrieves the deferred result.
**Status: not yet implemented.** The extension types exist but the `extensions`
capability map is not yet surfaced on `MCPServer`, and the runtime trails the
release. The TypeScript SDK deliberately removed its tasks example pending the
same work.
**Status: deferred.** Tasks ship in 2026-07-28 as
[SEP-2663](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/docs/seps/2663-tasks-extension.md),
an `io.modelcontextprotocol/tasks` extension that is wire-incompatible with the
2025-11-25 in-core design still carried (types-only) in `mcp_types`. The runtime
needs to be built to the SEP — server-decided augmentation (ignoring the legacy
`params.task`), the `{tasks/get, tasks/update, tasks/cancel}` method set, the
`resultType: "task"` envelope, `execution.taskSupport` gating, and `ttlMs`
fields — so it lands in a separate PR with the conformance `tasks-*` scenarios
wired in.
## Spec
[Tasks — basic utilities](https://modelcontextprotocol.io/specification/draft/basic/utilities/tasks)
[SEP-2663 — Tasks extension](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/docs/seps/2663-tasks-extension.md)
· [SEP-2133 — extensions capability](https://github.com/modelcontextprotocol/modelcontextprotocol/issues/2133)
## See also
`apps/` (the additive half of the extension API).