azure-typespec-author

# Azure TypeSpec Author This skill authors and modifies Azure TypeSpec (`.tsp`) API specifications for ARM resource-manager and data-plane services, covering versioning, resources, operations, models, decorators, constraints, and other schema changes that must follow the repository's TypeSpec authoring workflow. ## Triggers USE FOR: any TypeSpec/tsp change — api versions (add, bump, preview, stable, promote), resources, operations, models, properties, decorators, visibility, constraints, breaking changes, LRO, suppressions, operationId, spread model WHEN: "add TypeSpec API version", "modify .tsp file", "change TypeSpec decorators", "update TypeSpec models or operations", "author Azure TypeSpec" DO NOT USE FOR: SDK generation, releasing SDK packages, or single MCP tool calls The `azure-typespec-author` skill **must** be invoked immediately in all modes (including plan mode) for any task that involves creating and modifying TypeSpec (`.tsp`) files except for `client.tsp` under the specification directory in this repository. **This skill MUST be used regardless of how simple the task appears** — there are no "simple" TypeSpec edits. Even trivial-seeming changes (adding a single enum value, one property, one operation) require the full workflow because versioning decorators, validation, and compliance checks are mandatory. This includes but is not limited to: - Adding, bumping, or promoting API versions (preview, stable) for ARM or data-plane services - Adding or modifying resources, operations, models, properties, or decorators - Changing visibility, constraints, breaking changes, LRO patterns, or suppressions - Defining or updating operationId, spread models, or extension resources - Converting Swagger to TypeSpec (post-conversion edits) ## MCP Tools | Tool | Purpose | | ------------------------------------------------- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `azure-sdk-mcp:azsdk_typespec_retrieve_knowledge` | Retrieve knowledge for requests **not** covered by the eight cases in [reference-document-links.md](references/reference-document-links.md). Covered cases use agentic search (`web_fetch`) instead. | | `azure-sdk-mcp:azsdk_run_typespec_validation` | Validate TypeSpec | **Prerequisite:** `azure-sdk-mcp` server must be running. ## Rules - **Do NOT skip this skill for "simple" tasks** — there are no simple TypeSpec edits. A single property addition can require `@added` decorators, version gating, and validation. Always invoke this skill. - **Always follow the full workflow** — even seemingly simple changes (e.g. adding a default value) can require complex versioning decorator changes. Never skip steps. - **Mandatory for ALL `.tsp` edits** — even a single `?` change can be breaking. - **Minimal, scoped edits** — only change what the request requires. - **Always validate** — run every steps in [validation](references/validation.md) after every edit. - **Always cite references** — provide links that justify the approach. - **Follow the authoring plan exactly** — code changes in Step 4 MUST follow the authoring plan generated in Step 3. Do not deviate by referring to existing code patterns in the TypeSpec project; the authoring plan is the single source of truth for what to change. ## Steps > Analyze → Intake → Plan → Apply → Validate → Output reference links - [ ] Step 1 — Analyze project - [ ] Step 2 — Intake - [ ] Step 3 — Build authoring plan - [ ] Step 4 — Apply changes - [ ] Step 5 — Validate - [ ] Step 6 — Output reference links ### Step 1: Analyze Project See [analyze-project.md](references/analyze-project.md). ### Step 2: Intake See [intake.md](references/intake.md). ### Step 3: Build Authoring Plan See [authoring-plan.md](references/authoring-plan.md). ### Step 4: Apply Changes Make minimal `.tsp` edits following the plan from Step 3. Confirm uncertainties with the user first. ### Step 5: Validate See [validation.md](references/validation.md). Always run 5.1 general validation (5.1.1 TypeSpec validation and 5.1.2 `tsp compile .`); run 5.2 case-specific validation whenever its case matches. **Output the validation results as a checklist.** Report one line per check, each marked ✅ (pass) or ❌ (fail) with a short note. Fix every ❌ and re-run until all checks pass. For API Versioning (Case 3) the checklist **must** cover every §5.2 Case 3 check — including: the new version's `examples/` folder exists; no example folder remains for a version absent from the `Versions` enum; no decorator references a version absent from the enum; every carried-over feature is present with its decorators rebased onto the new version (not reverted); every excluded feature is fully removed. ### Step 6: Output Reference Links Output all referenced document URLs from Step 3. This gives the user direct links to the documentation that informed the changes. ## Reference Files | File | Purpose | | --------------------------------------------------------------------- | ------------------------------------------- | | [analyze-project.md](references/analyze-project.md) | Step 1: project analysis | | [intake.md](references/intake.md) | Step 2: general + case-specific intake | | [authoring-plan.md](references/authoring-plan.md) | Step 3: build authoring plan (Option A + B) | | [agentic-search.md](references/agentic-search.md) | Procedure: fetch URLs → extract guidance | | [reference-document-links.md](references/reference-document-links.md) | Catalog of external guide URLs | | [validation.md](references/validation.md) | Step 5: validate → compile → verify | ## Examples - "Add a new preview API version 2026-01-01-preview for widget resource manager" - "Add an ARM resource named Asset with CRUD operations" - "Add a new property to the Widget model" - "Add a list operation for the WidgetSuite resource using Azure.Core templates" - "Add a new preview API version to a data-plane service" - "Create a data-plane resource interface with full CRUD and list operations"