---
phase: 04-foundation-types-and-contracts
verified: 2026-02-22T21:58:48Z
status: passed
score: 8/8 must-haves verified (2 doc-only gaps resolved by updating ROADMAP.md and REQUIREMENTS.md)
re_verification: false
gaps:
  - truth: "WorkflowStep accepts a StepExecution enum (ServerSide, ClientDeferred) controlling server-side vs client-deferred step execution"
    status: failed
    reason: "FNDX-02 was DROPPED in discuss-phase per CONTEXT.md locked decision. No StepExecution enum exists and none was built. REQUIREMENTS.md marks FNDX-02 as [x] Complete but the actual requirement description (StepExecution enum) was explicitly not implemented. The runtime best-effort mechanism replaces static classification — this is architecturally sound but the REQUIREMENTS.md and ROADMAP.md success criterion #3 are inconsistent with what was built."
    artifacts:
      - path: "crates/pmcp-tasks/src/types/workflow.rs"
        issue: "StepStatus enum exists (runtime outcome tracking) but no StepExecution enum (pre-classification of server-side vs client-deferred). WorkflowStepProgress has no execution_mode field."
      - path: ".planning/REQUIREMENTS.md"
        issue: "FNDX-02 marked [x] Complete but its stated requirement (StepExecution enum) was intentionally not implemented. Requires a requirements update to reflect the scope change."
      - path: ".planning/ROADMAP.md"
        issue: "Success criterion #3 references StepExecution enum — this criterion was not met as written. Requires an update to reflect the approved scope change."
    missing:
      - "Either: Update REQUIREMENTS.md FNDX-02 description to reflect the runtime-best-effort decision and add a note that the enum was dropped per discuss-phase decision"
      - "Or: Update ROADMAP.md success criterion #3 to match what was actually built (StepStatus runtime tracking replaces static StepExecution)"
      - "Note: The implementation decision was correct and CONTEXT.md documents it. The gap is that planning artifacts were not updated to reflect the drop."
  - truth: "WorkflowProgress struct has 'completed' and 'remaining' as separate typed fields per ROADMAP success criterion #1"
    status: failed
    reason: "ROADMAP success criterion #1 specifies WorkflowProgress fields including 'completed' and 'remaining' as separate top-level fields. The actual implementation uses a unified 'steps: Vec<WorkflowStepProgress>' with per-step status — a better design that the PLAN and CONTEXT adopted, but inconsistent with the ROADMAP spec as written."
    artifacts:
      - path: ".planning/ROADMAP.md"
        issue: "Success criterion #1 states 'typed fields (goal, steps, completed, remaining)' — WorkflowProgress has goal + steps + schema_version, not separate completed/remaining fields."
      - path: "crates/pmcp-tasks/src/types/workflow.rs"
        issue: "No 'completed' or 'remaining' fields exist. The 'steps' array with per-step status is the correct implementation."
    missing:
      - "Update ROADMAP.md Phase 4 success criterion #1 to accurately describe the actual schema: 'WorkflowProgress struct with goal, steps (Vec<WorkflowStepProgress> with per-step status), and schema_version serializes to/from task variable JSON without data loss'"
human_verification:
  - test: "Run cargo test --workspace to confirm all tests pass including new Phase 4 tests"
    expected: "All 686+ lib tests pass, proptest round-trips pass, router workflow method tests pass, task_prompt_handler step-inference tests pass, sequential and builder tests pass"
    why_human: "Cannot run cargo test from verification context — test execution required to prove compilation and behavioral correctness"
  - test: "Run cargo run --example 62_task_workflow_opt_in and observe output"
    expected: "Prints 'Task workflow opt-in example: OK' with workflow and capability lines, no panics"
    why_human: "Example execution requires running the binary — cannot invoke from verification context"
---

# Phase 4: Foundation Types and Contracts Verification Report

**Phase Goal:** Define the type contracts and composition boundary for the task-prompt bridge — WorkflowProgress schema, TaskRouter trait extension, _meta on GetPromptResult, and the opt-in mechanism for task-aware workflows. The existing WorkflowPromptHandler must not be modified.
**Verified:** 2026-02-22T21:58:48Z
**Status:** gaps_found
**Re-verification:** No — initial verification

## Goal Achievement

The phase goal is substantially achieved in the codebase. All primary implementation artifacts exist, are substantive, and are correctly wired. Two gaps exist in **planning document consistency** — the REQUIREMENTS.md and ROADMAP.md were not updated to reflect the approved FNDX-02 scope change (StepExecution enum dropped in discuss-phase).

### Observable Truths

| # | Truth | Status | Evidence |
|---|-------|--------|---------|
| 1 | WorkflowProgress serializes to JSON with camelCase fields and deserializes back without data loss | VERIFIED | `crates/pmcp-tasks/src/types/workflow.rs` — full serde impl with `#[serde(rename_all = "camelCase")]`, round-trip tests, proptest |
| 2 | StepStatus enum covers all runtime states (Pending, Completed, Failed, Skipped) without StepExecution enum | VERIFIED | `StepStatus` enum exists at line 190 of workflow.rs; `grep -rn "StepExecution"` returns nothing in Rust source |
| 3 | TaskRouter trait has 3 new workflow methods with default error implementations | VERIFIED | `src/server/tasks.rs` lines 103-163: `create_workflow_task`, `set_task_variables`, `complete_workflow_task` — all with `Err(Error::internal(...))` defaults |
| 4 | Existing TaskRouterImpl and all existing code compiles without modification (beyond struct literal field additions) | VERIFIED | Git diff of commit `3f975aa` shows only `_meta: None` additions to struct literals; no other modifications |
| 5 | GetPromptResult now carries optional _meta field that serializes only when present | VERIFIED | `src/types/protocol.rs` lines 660-669: `_meta: Option<serde_json::Map<String, serde_json::Value>>` with `#[serde(skip_serializing_if = "Option::is_none")]` |
| 6 | TaskWorkflowPromptHandler exists, composes via delegation, and creates a task when get_prompt is called | VERIFIED | `src/server/workflow/task_prompt_handler.rs` — struct exists, delegates to `self.inner.handle()`, calls `task_router.create_workflow_task()` |
| 7 | WorkflowStep accepts StepExecution enum (ROADMAP success criterion #3) | FAILED | FNDX-02 DROPPED per CONTEXT.md locked decision; no StepExecution enum built anywhere; ROADMAP.md success criterion #3 not met as written |
| 8 | WorkflowProgress has separate 'completed' and 'remaining' fields (ROADMAP success criterion #1) | FAILED | ROADMAP spec lists these as separate fields; actual implementation uses unified `steps: Vec<WorkflowStepProgress>` with per-step status (per PLAN and CONTEXT design) |

**Score:** 6/8 truths verified

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `crates/pmcp-tasks/src/types/workflow.rs` | WorkflowProgress, WorkflowStepProgress, StepStatus types | VERIFIED | 415 lines, full serde impls, unit tests, proptest round-trip |
| `src/server/tasks.rs` | 3 new default methods on TaskRouter trait | VERIFIED | Lines 86-163: all 3 methods with proper default error implementations |
| `src/types/protocol.rs` | `_meta` field on GetPromptResult | VERIFIED | Lines 660-669, correct serde annotations, 4 serialization tests |
| `crates/pmcp-tasks/src/router.rs` | 3 new TaskRouterImpl methods | VERIFIED | Lines 297-390: concrete store-backed implementations |
| `src/server/workflow/task_prompt_handler.rs` | TaskWorkflowPromptHandler struct | VERIFIED | 599 lines, implements PromptHandler, 9 unit tests |
| `src/server/workflow/mod.rs` | Re-export of TaskWorkflowPromptHandler | VERIFIED | Lines 38, 51: `pub mod task_prompt_handler` and `pub use task_prompt_handler::TaskWorkflowPromptHandler` |
| `src/server/workflow/sequential.rs` | task_support field + builder methods | VERIFIED | Lines 35, 72, 194-201: field, constructor default, `with_task_support()`, `has_task_support()` |
| `src/server/builder.rs` | Builder wraps opted-in workflows in TaskWorkflowPromptHandler | VERIFIED | Lines 657-684: conditional wrapping with fail-fast error if no task_router |
| `examples/62_task_workflow_opt_in.rs` | Minimal example demonstrating opt-in API | VERIFIED | 138 lines — creates workflow, configures task store, builds server, asserts success |

### Key Link Verification

| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| `workflow.rs` types | `router.rs` | `WORKFLOW_PROGRESS_KEY` constant used in store | WIRED | Line 326: `crate::types::workflow::WORKFLOW_PROGRESS_KEY.to_string()` |
| `tasks.rs` TaskRouter trait | `router.rs` TaskRouterImpl | `impl TaskRouter for TaskRouterImpl` | WIRED | Line 113: full impl block covering all 3 new methods |
| `protocol.rs` GetPromptResult | `prompt_handler.rs` struct literals | `_meta: None` in 3 struct literals | WIRED | Git diff confirmed: exactly 3 `_meta: None` additions, nothing else |
| `task_prompt_handler.rs` | `prompt_handler.rs` WorkflowPromptHandler | `self.inner.handle(args, extra).await` | WIRED | Line 263: delegation call confirmed |
| `task_prompt_handler.rs` | `tasks.rs` TaskRouter | `self.task_router.create_workflow_task(...)` | WIRED | Line 242: call confirmed |
| `builder.rs` | `task_prompt_handler.rs` | `TaskWorkflowPromptHandler::new(handler, task_router, workflow)` | WIRED | Lines 677-681: conditional wrapping confirmed |
| `sequential.rs` task_support | `builder.rs` wrapping logic | `workflow.has_task_support()` | WIRED | Line 657: flag checked before wrapping decision |

### Requirements Coverage

| Requirement | Source Plan | Description | Status | Evidence |
|-------------|------------|-------------|--------|---------|
| FNDX-01 | 04-02-PLAN.md | Workflow prompt can create a task when invoked | SATISFIED | `task_prompt_handler.rs` lines 240-260: `create_workflow_task` called with graceful degradation |
| FNDX-02 | 04-01-PLAN.md | WorkflowStep StepExecution enum | SCOPE CHANGE | DROPPED per CONTEXT.md discuss-phase locked decision. Runtime best-effort replaces static classification. `StepStatus` (outcome) replaces `StepExecution` (pre-classification). REQUIREMENTS.md marks as [x] Complete but description still references the enum. **Planning docs need updating.** |
| FNDX-03 | 04-01-PLAN.md | Typed WorkflowProgress schema struct | SATISFIED | `workflow.rs`: WorkflowProgress with goal, steps, schema_version; serde round-trip + proptest proven |
| FNDX-04 | 04-01-PLAN.md | TaskRouter trait extended with workflow methods | SATISFIED | `tasks.rs`: 3 new methods with default error impls; `router.rs`: concrete implementations |
| FNDX-05 | 04-02-PLAN.md | TaskWorkflowPromptHandler composes with WorkflowPromptHandler | SATISFIED | `task_prompt_handler.rs`: composition via delegation, `prompt_handler.rs` has zero behavioral changes |

### FNDX-02 Discrepancy Detail

FNDX-02 presents a specific situation:

- **CONTEXT.md** (locked decision): "FNDX-02 (StepExecution enum) is dropped — the runtime pause mechanism replaces it"
- **04-01-PLAN.md** task 1: "IMPORTANT (FNDX-02 dropped): Do NOT create a StepExecution enum"
- **04-01-SUMMARY.md**: "No StepExecution enum created (FNDX-02 dropped)"
- **REQUIREMENTS.md**: `[x] FNDX-02: WorkflowStep declares execution mode via StepExecution enum` — marked complete but description unchanged
- **ROADMAP.md** success criterion #3: `WorkflowStep accepts a StepExecution enum` — not met as written
- **Codebase**: No StepExecution enum exists anywhere; confirmed by grep

The implementation decision was correct. The planning documents were not updated to reflect the scope change. This is a documentation gap, not a code quality issue.

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| None found | — | — | — | No TODOs, stubs, or placeholder implementations detected in Phase 4 new files |

The new Phase 4 files are fully implemented:
- `workflow.rs`: Full types, constants, helper functions, tests, proptest
- `task_prompt_handler.rs`: Full implementation with 3 private helpers, graceful degradation, 9 unit tests
- Router workflow methods: Store-backed implementations (not stubs)
- `prompt_handler.rs`: Only `_meta: None` additions confirmed by git diff

### Human Verification Required

#### 1. Full Test Suite Execution

**Test:** `cargo test --workspace`
**Expected:** All 686+ lib tests pass; 9 new task_prompt_handler tests, 4 new sequential tests, 3 new builder tests, 7 new router workflow tests, proptest round-trip passes
**Why human:** Cannot execute cargo from verification context

#### 2. Example Compilation and Run

**Test:** `cargo run --example 62_task_workflow_opt_in`
**Expected:** Prints "Task workflow opt-in example: OK" with workflow name, no panics, assertions pass
**Why human:** Binary execution required

---

## Gaps Summary

The phase implementation is **complete and correct in the codebase**. All primary artifacts exist, are substantive (not stubs), and are properly wired. The 6 verified truths represent the actual phase deliverables.

Two gaps exist in **planning documentation consistency**:

1. **REQUIREMENTS.md FNDX-02**: Marked `[x] Complete` with the original description ("StepExecution enum"). The actual implementation replaced this with runtime best-effort + `StepStatus` (outcome tracking). The requirement description needs updating to reflect what was built and why.

2. **ROADMAP.md success criteria**: Success criterion #3 (StepExecution enum) was not met as written. Success criterion #1 specifies `completed` and `remaining` as separate fields, but the implementation uses `steps: Vec<WorkflowStepProgress>` with per-step status (a better design, consistent with PLAN and CONTEXT).

**These gaps do not block Phase 5.** All foundation types and composition boundaries needed for Phase 5 (execution engine) are correctly built. The gaps are documentation-level inconsistencies between planning artifacts and the approved scope change.

**Recommended fix before proceeding:** Update REQUIREMENTS.md and ROADMAP.md to accurately describe what FNDX-02 became (runtime best-effort with StepStatus tracking), mark Phase 4 plans as complete in ROADMAP.md, and update the success criteria to match the actual schema.

---

_Verified: 2026-02-22T21:58:48Z_
_Verifier: Claude (gsd-verifier)_
