---
phase: 42-add-outputschema-top-level-support
plan: 02
subsystem: api
tags: [mcp-spec, output-schema, tool-info, annotations, cargo-pmcp, docs]

requires:
  - phase: 42-add-outputschema-top-level-support
    provides: ToolInfo.output_schema top-level field and ToolAnnotations.with_output_type_name()
provides:
  - cargo-pmcp local ToolSchema with top-level output_schema
  - cargo-pmcp local ToolAnnotations without output_schema
  - Updated tests verifying MCP spec 2025-06-18 JSON format
  - Updated docs and course content for top-level outputSchema
affects: [cargo-pmcp-codegen, mcp-spec-compliance, course-content]

tech-stack:
  added: []
  patterns: [output-schema-top-level-json-format]

key-files:
  created: []
  modified:
    - cargo-pmcp/src/commands/schema.rs
    - cargo-pmcp/src/templates/calculator.rs
    - tests/tool_annotations_test.rs
    - examples/48_structured_output_schema.rs
    - docs/OUTPUT_SCHEMA_ANNOTATIONS.md
    - pmcp-course/src/part2-design/ch05-02-output-schemas.md
    - pmcp-course/src/part2-design/ch05-03-annotations.md

key-decisions:
  - "cargo-pmcp local ToolSchema mirrors SDK ToolInfo with top-level output_schema"
  - "All documentation and course content updated to show outputSchema at top level, pmcp:outputTypeName in annotations"

patterns-established:
  - "JSON format: outputSchema is sibling to inputSchema at top level, pmcp:outputTypeName remains in annotations"

requirements-completed: [OS-05, OS-06]

duration: 18min
completed: 2026-03-07
---

# Phase 42 Plan 02: Update Consumers for Top-Level outputSchema Summary

**Updated cargo-pmcp structs, tests, docs, and course content to reflect outputSchema as top-level ToolInfo field per MCP spec 2025-06-18**

## Performance

- **Duration:** 18 min
- **Started:** 2026-03-07T22:48:52Z
- **Completed:** 2026-03-07T23:06:32Z
- **Tasks:** 2
- **Files modified:** 7

## Accomplishments
- cargo-pmcp local ToolSchema now has top-level output_schema field; local ToolAnnotations no longer has output_schema
- Added test_output_schema_json_format verifying outputSchema appears as sibling to inputSchema in JSON
- Rewrote OUTPUT_SCHEMA_ANNOTATIONS.md to show top-level outputSchema pattern
- Updated course chapters ch05-02 and ch05-03 with correct API usage

## Task Commits

Each task was committed atomically:

1. **Task 1: Update cargo-pmcp schema structs and calculator template** - `1de52ff` (feat)
2. **Task 2: Rewrite tests and update example and docs** - `d59c960` (feat)

## Files Created/Modified
- `cargo-pmcp/src/commands/schema.rs` - Added output_schema to local ToolSchema, removed from local ToolAnnotations
- `cargo-pmcp/src/templates/calculator.rs` - Updated doc comments to reference top-level outputSchema
- `tests/tool_annotations_test.rs` - Added test_output_schema_json_format, fixed formatting
- `examples/48_structured_output_schema.rs` - Updated doc comments for MCP spec 2025-06-18
- `docs/OUTPUT_SCHEMA_ANNOTATIONS.md` - Rewritten for top-level outputSchema pattern
- `pmcp-course/src/part2-design/ch05-02-output-schemas.md` - Updated Output Schema on ToolInfo section
- `pmcp-course/src/part2-design/ch05-03-annotations.md` - Updated combining with output schema examples

## Decisions Made
- cargo-pmcp local ToolSchema mirrors SDK ToolInfo with top-level output_schema (using alias = "outputSchema" for deserialization)
- All documentation consistently shows outputSchema at top level with pmcp:outputTypeName in annotations

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 1 - Bug] Fixed pre-existing formatting issues in test file**
- **Found during:** Task 2 (verification step)
- **Issue:** tests/tool_annotations_test.rs had formatting issues from plan 01 that cargo fmt --check caught
- **Fix:** Ran cargo fmt --all to fix formatting
- **Files modified:** tests/tool_annotations_test.rs
- **Verification:** cargo fmt --all --check passes
- **Committed in:** d59c960 (Task 2 commit)

**2. [Rule 2 - Missing Critical] Updated course content (ch05-02, ch05-03)**
- **Found during:** Task 2 (plan explicitly requested checking course files)
- **Issue:** Course files still referenced old ToolAnnotations::with_output_schema() and pmcp:outputSchema annotation pattern
- **Fix:** Updated both chapter files to use ToolInfo::with_output_schema() and top-level JSON format
- **Files modified:** pmcp-course/src/part2-design/ch05-02-output-schemas.md, ch05-03-annotations.md
- **Verification:** Content accurately reflects new API
- **Committed in:** d59c960 (Task 2 commit)

---

**Total deviations:** 2 auto-fixed (1 bug, 1 missing critical)
**Impact on plan:** Both auto-fixes necessary for consistency. No scope creep.

## Issues Encountered
None

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- outputSchema migration complete across all SDK consumers
- All tests, docs, course content, and CLI tools reflect MCP spec 2025-06-18
- Phase 42 fully complete

---
*Phase: 42-add-outputschema-top-level-support*
*Completed: 2026-03-07*
