---
phase: 42-add-outputschema-top-level-support
verified: 2026-03-07T23:30:00Z
status: passed
score: 8/8 must-haves verified
re_verification: false
---

# Phase 42: Add outputSchema Top-Level Support Verification Report

**Phase Goal:** Migrate output_schema from ToolAnnotations to a top-level field on ToolInfo, aligning with MCP spec 2025-06-18. Clean break -- remove from annotations, keep pmcp:outputTypeName as codegen extension.
**Verified:** 2026-03-07T23:30:00Z
**Status:** passed
**Re-verification:** No -- initial verification

## Goal Achievement

### Observable Truths

| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | ToolInfo serializes outputSchema as a top-level sibling to inputSchema | VERIFIED | `pub output_schema: Option<Value>` at protocol.rs:222, right after `input_schema`; serde rename_all camelCase handles JSON key; test_output_schema_json_format verifies JSON sibling placement |
| 2 | ToolAnnotations no longer contains output_schema field or with_output_schema method | VERIFIED | ToolAnnotations struct (protocol.rs:97-130) has no output_schema field; grep for `annotations.output_schema` in src/ returns zero matches; grep for `annotations.with_output_schema` returns zero matches in source |
| 3 | TypedToolWithOutput::metadata() sets output_schema on ToolInfo directly | VERIFIED | typed_tool.rs:717 `output_schema: self.output_schema.clone()` in ToolInfo struct literal; test `test_typed_tool_with_output_with_ui_and_output_schema_coexist` passes asserting `info.output_schema.is_some()` |
| 4 | #[tool(output_type)] macro emits top-level output_schema on ToolInfo | VERIFIED | pmcp-macros/src/tool.rs:269 `.with_output_schema(Self::output_schema())` chained on ToolInfo; line 256 `.with_output_type_name()` on annotations |
| 5 | pmcp:outputTypeName remains in annotations as PMCP codegen extension | VERIFIED | protocol.rs:126 `rename = "pmcp:outputTypeName"` serde attribute on `output_type_name` field; `with_output_type_name()` method at protocol.rs:198 |
| 6 | cargo-pmcp schema export deserializes top-level outputSchema from servers | VERIFIED | cargo-pmcp/src/commands/schema.rs:130 local ToolSchema has `output_schema: Option<Value>` field |
| 7 | All tests pass verifying top-level output_schema on ToolInfo and pmcp:outputTypeName in annotations | VERIFIED | 12/12 tool_annotations_test tests pass; 8/8 typed_tool tests pass; workspace compiles clean |
| 8 | Documentation reflects outputSchema as top-level field per MCP spec 2025-06-18 | VERIFIED | docs/OUTPUT_SCHEMA_ANNOTATIONS.md references "top-level outputSchema field on ToolInfo" throughout; example 48 doc comments reference MCP spec 2025-06-18 |

**Score:** 8/8 truths verified

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `src/types/protocol.rs` | ToolInfo.output_schema field, builder, ToolAnnotations.with_output_type_name() | VERIFIED | Field at L222, builder at L334, type name method at L198 |
| `src/server/typed_tool.rs` | TypedToolWithOutput::metadata() rewired to top-level | VERIFIED | output_schema set at L717, has_annotations checks output_type_name at L711 |
| `pmcp-macros/src/tool.rs` | Macro codegen emitting top-level output_schema | VERIFIED | .with_output_schema() on ToolInfo at L269, .with_output_type_name() on annotations at L256 |
| `cargo-pmcp/src/commands/schema.rs` | Local ToolSchema with top-level output_schema | VERIFIED | Field at L130 |
| `tests/tool_annotations_test.rs` | Tests verifying top-level output_schema | VERIFIED | 12 tests pass including test_output_schema_json_format |
| `docs/OUTPUT_SCHEMA_ANNOTATIONS.md` | Updated documentation | VERIFIED | References top-level outputSchema throughout |
| `src/server/wasm_server.rs` | output_schema: None in struct literal | VERIFIED | L433 |
| `src/server/wasm_typed_tool.rs` | output_schema: None in struct literals | VERIFIED | L112, L208 |

### Key Link Verification

| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| src/server/typed_tool.rs | src/types/protocol.rs | TypedToolWithOutput::metadata() sets ToolInfo.output_schema | WIRED | L717: `output_schema: self.output_schema.clone()` |
| pmcp-macros/src/tool.rs | src/types/protocol.rs | Macro emits .with_output_schema() on ToolInfo | WIRED | L269: `.with_output_schema(Self::output_schema())` |
| cargo-pmcp/src/commands/schema.rs | MCP server JSON | Deserializes outputSchema from top-level | WIRED | Local ToolSchema struct has output_schema field with serde alias |
| tests/tool_annotations_test.rs | src/types/protocol.rs | Tests verify ToolInfo.output_schema | WIRED | All 12 tests exercise top-level output_schema and output_type_name |

### Requirements Coverage

| Requirement | Source Plan | Description | Status | Evidence |
|-------------|------------|-------------|--------|----------|
| OS-01 | 42-01 | (No REQUIREMENTS.md found -- inferred from plan context) | SATISFIED | output_schema on ToolInfo top-level |
| OS-02 | 42-01 | Remove output_schema from ToolAnnotations | SATISFIED | Field and method removed |
| OS-03 | 42-01 | ToolInfo::with_output_schema() builder | SATISFIED | Method at protocol.rs:334 |
| OS-04 | 42-01 | Macro codegen targets top-level | SATISFIED | pmcp-macros/src/tool.rs:269 |
| OS-05 | 42-02 | cargo-pmcp local structs updated | SATISFIED | schema.rs output_schema on ToolSchema |
| OS-06 | 42-02 | Tests and docs reflect new placement | SATISFIED | 12 tests pass, docs updated |

Note: No REQUIREMENTS.md file was found in .planning/. Requirement IDs OS-01 through OS-06 are declared in PLAN frontmatter but cannot be cross-referenced against a central requirements document. All six are accounted for based on plan must_haves.

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| src/server/typed_tool.rs | 615 | Stale doc comment references "pmcp:outputSchema" (should be "outputSchema on ToolInfo" or "pmcp:outputTypeName") | Info | No functional impact; documentation inaccuracy in doc comment |

### Human Verification Required

None required. All verifiable truths confirmed programmatically via compilation, test execution, and code inspection.

### Gaps Summary

No gaps found. All 8 observable truths verified. The workspace compiles cleanly, all tests pass (12 annotation tests, 8 typed tool tests), and the old `output_schema` field has been completely removed from `ToolAnnotations`. The only minor finding is a stale doc comment at typed_tool.rs:615 referencing "pmcp:outputSchema" which has no functional impact.

---

_Verified: 2026-03-07T23:30:00Z_
_Verifier: Claude (gsd-verifier)_
