SEP Phase 1: TypeScript extension SDK + tool-path fixtures#145
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Add @smooai/smooth-extension-sdk — the TS SDK for building SEP extensions. defineExtension/defineTool (zod v4 z.toJSONSchema + raw JSON-Schema/TypeBox pass-through), a symmetric JSON-RPC 2.0 Peer, ndjson stdio transport plus an in-memory linkedPair, createTestHost (in-process scripted host), runConformance (replays the shared fixtures against a real extension subprocess), and the hello demo extension (hello.greet: zod schema, streamed tool/update progress, $/cancel cancellation). Wired into pnpm-workspace + the typescript CI lane. Extends spec/extension/conformance/fixtures.json for the tool path: is_error and details tool results, a message-only tool/update, and invalid fixtures. Plan: /Users/brentrager/.claude/plans/greedy-yawning-petal.md Phase 0: spec #142, engine host core#21. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SqrZj2fVMqiHbSJSte3XbA
🦋 Changeset detectedLatest commit: b58ccd6 The changes in this PR will be included in the next version bump. This PR includes changesets to release 2 packages
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Problem
SEP Phase 0 shipped the protocol spec (
spec/extension/, PR #142) and the Rust engine reference host (smooth-operator-core#21). Phase 1 needs the developer-facing surface: a TypeScript SDK so extensions can actually be written, tested, and conformance-checked, plus the tool-path completed end to end.Solution
New published package
@smooai/smooth-extension-sdk(typescript/extension-sdk/):defineExtension/defineTool— declare an extension and its tools.parametersaccepts zod v4 (converted viaz.toJSONSchema()), TypeBox, or raw JSON Schema (pass-through) — the wire truth is always JSON Schema.Peer— a symmetric JSON-RPC 2.0 endpoint (both sides issue requests); the shared core the runtime and test host are built on. Inbound-request cancellation via$/cancel, outbound cancellation viaAbortSignal.stdioTransport(ndjson over stdio, the real wire) andlinkedPair(in-memory, for in-process tests).createTestHost— drive an extension in-process (no subprocess):initialize,callTool(withonUpdateprogress +AbortSignalcancel),sendEvent,ping,shutdown.runConformance— spawn a real extension subprocess, handshake, and replay the shared fixtures, validating every reply against its schema.hellodemo extension (hello.greet) — zod schema, streamedtool/updateprogress,$/cancelcancellation.Extends
spec/extension/conformance/fixtures.jsonfor the tool path (is_error/detailsresults, message-onlytool/update, invalid fixtures). Wired intopnpm-workspace.yamland thetypescript.ymlCI lane (typecheck + test filters).Verification
@smooai/smooth-extension-sdk: 15 tests (schema conversion, JSON-RPC leaf, full tool path viacreateTestHost, liverunConformanceagainstecho.mjs).Plan:
/Users/brentrager/.claude/plans/greedy-yawning-petal.md· Phase 0: spec #142, engine host core#21.🤖 Generated with Claude Code
https://claude.ai/code/session_01SqrZj2fVMqiHbSJSte3XbA