---
phase: 03-handler-middleware-and-server-integration
verified: 2026-02-21T00:00:00Z
status: passed
score: 12/12 must-haves verified
re_verification: false
---

# Phase 3: Handler Middleware and Server Integration Verification Report

**Phase Goal:** A PMCP server can advertise task support, intercept task-augmented tool calls, route all four task endpoints, and run a complete create-poll-complete lifecycle end to end
**Verified:** 2026-02-21
**Status:** PASSED
**Re-verification:** No — initial verification

## Goal Achievement

### Observable Truths

| #  | Truth                                                                                                  | Status     | Evidence                                                                                                     |
|----|--------------------------------------------------------------------------------------------------------|------------|--------------------------------------------------------------------------------------------------------------|
| 1  | CallToolRequest has an optional task field that deserializes from JSON-RPC tools/call requests         | VERIFIED   | `pub task: Option<Value>` at line 376 of `src/types/protocol.rs`; serde roundtrip test passes                |
| 2  | ToolInfo has an optional execution field that serializes into tools/list responses                     | VERIFIED   | `pub execution: Option<Value>` at line 260 of `src/types/protocol.rs`                                       |
| 3  | ClientRequest enum has four task variants that parse from JSON-RPC methods                             | VERIFIED   | TasksGet/TasksResult/TasksList/TasksCancel at lines 1028-1039; `test_task_client_request_variants` passes    |
| 4  | ServerCoreBuilder.with_task_store() stores router and auto-configures experimental.tasks capability    | VERIFIED   | `with_task_store()` at line 555 of `src/server/builder.rs` inserts tasks into `experimental` capability map |
| 5  | ServerCore stores task_router field                                                                    | VERIFIED   | `task_router: Option<Arc<dyn TaskRouter>>` at line 158 of `src/server/core.rs`                              |
| 6  | tools/call with task field returns CreateTaskResult immediately (interception before normal tool path) | VERIFIED   | Interception at line 727 in `src/server/core.rs`; `full_lifecycle_create_poll_complete_result` test passes   |
| 7  | tools/call to tool with taskSupport:required auto-creates task without explicit task field             | VERIFIED   | `auto_task_for_required_tool` integration test passes; `tool_requires_task` method in router.rs              |
| 8  | tasks/get returns current task state for polling                                                       | VERIFIED   | `handle_tasks_get` in router.rs lines 170-184; polled in lifecycle test step 2 and step 4                    |
| 9  | tasks/result returns stored operation result with related-task _meta for terminal tasks                | VERIFIED   | `handle_tasks_result` in router.rs lines 190-207; `_meta` with `io.modelcontextprotocol/related-task` set   |
| 10 | tasks/list returns paginated tasks scoped to requesting owner                                          | VERIFIED   | `handle_tasks_list` in router.rs lines 212-241; `tasks_list_returns_owner_scoped_tasks` test passes          |
| 11 | tasks/cancel transitions non-terminal tasks to cancelled status                                        | VERIFIED   | `handle_tasks_cancel` in router.rs lines 246-260; `tasks_cancel_transitions_to_cancelled` test passes        |
| 12 | Full create-poll-complete lifecycle works end to end through ServerCore::handle_request                | VERIFIED   | `full_lifecycle_create_poll_complete_result` test: 11/11 tests pass via real `handle_request()` path         |

**Score:** 12/12 truths verified

---

### Required Artifacts

| Artifact                                                         | Expected                                                                       | Status   | Details                                                                           |
|------------------------------------------------------------------|--------------------------------------------------------------------------------|----------|-----------------------------------------------------------------------------------|
| `src/types/protocol.rs`                                          | task field on CallToolRequest, execution on ToolInfo, four task variants       | VERIFIED | All present; contains "TasksGet"; 1549+ lines with serde roundtrip tests          |
| `src/server/tasks.rs`                                            | TaskRouter trait with 8 methods                                                | VERIFIED | 85 lines; all 8 methods defined; no circular dep                                  |
| `src/server/builder.rs`                                          | with_task_store() method                                                       | VERIFIED | Method at line 555; test `test_builder_with_task_store_sets_capabilities` passes  |
| `src/server/core.rs`                                             | task_router field, routing in handle_request_internal, resolve_task_owner      | VERIFIED | Field at line 158; routing at lines 727-870; resolve_task_owner helper at line 677|
| `crates/pmcp-tasks/src/router.rs`                               | TaskRouter implementation bridging TaskStore to pmcp trait                     | VERIFIED | 626 lines; `impl TaskRouter for TaskRouterImpl` with all 8 methods                |
| `crates/pmcp-tasks/src/lib.rs`                                   | Re-export of router module and TaskRouterImpl                                  | VERIFIED | `pub mod router` and `pub use router::TaskRouterImpl` present                     |
| `crates/pmcp-tasks/tests/lifecycle_integration.rs`              | Full lifecycle integration tests (min 100 lines)                               | VERIFIED | 546 lines; 11 tests all passing via `cargo test --package pmcp-tasks --test lifecycle_integration` |
| `examples/60_tasks_basic.rs`                                     | Basic task-augmented tool call example (min 80 lines)                          | VERIFIED | 204 lines; compiles cleanly via `cargo check --example 60_tasks_basic`            |

---

### Key Link Verification

| From                                               | To                                          | Via                                                         | Status   | Details                                                                                          |
|----------------------------------------------------|---------------------------------------------|-------------------------------------------------------------|----------|--------------------------------------------------------------------------------------------------|
| `src/server/builder.rs`                            | `src/server/core.rs`                        | passes task_router through ServerCore::new()                | WIRED    | `self.task_router` passed at line 724 of builder.rs; received in `new()` at line 186 of core.rs |
| `src/types/protocol.rs`                            | `crates/pmcp-tasks/src/types/params.rs`     | ClientRequest task variants use Value (no circular dep)     | WIRED    | All task variants use `Value`; pmcp-tasks parses via serde_json in router.rs                     |
| `src/server/core.rs`                               | `crates/pmcp-tasks/src/router.rs`           | TaskRouter trait (defined in pmcp, implemented in pmcp-tasks)| WIRED    | `self.task_router.handle_task_call/get/result/list/cancel` called in core.rs                     |
| `crates/pmcp-tasks/src/router.rs`                 | `crates/pmcp-tasks/src/store/mod.rs`        | TaskStore operations for create/get/list/cancel/get_result  | WIRED    | `self.store.create/get/list/cancel/complete_with_result` called throughout router.rs             |
| `src/server/core.rs`                               | `src/server/auth/traits.rs`                 | AuthContext.subject and client_id for owner resolution      | WIRED    | `resolve_task_owner` reads `ctx.subject` and `ctx.client_id` at lines 679-681                   |
| `crates/pmcp-tasks/tests/lifecycle_integration.rs` | `src/server/core.rs`                        | ServerCore::handle_request() for end-to-end processing      | WIRED    | `server.handle_request(...)` called in all 11 integration tests                                  |
| `examples/60_tasks_basic.rs`                       | `crates/pmcp-tasks/src/router.rs`           | TaskRouterImpl used with ServerCoreBuilder                  | WIRED    | `use pmcp_tasks::{..., TaskRouterImpl, ...}` and `Arc::new(TaskRouterImpl::new(store.clone()))`  |

---

### Requirements Coverage

| Requirement | Source Plan | Description                                                                         | Status     | Evidence                                                                                    |
|-------------|-------------|-------------------------------------------------------------------------------------|------------|---------------------------------------------------------------------------------------------|
| INTG-01     | 03-01       | Server task capabilities advertised via `experimental.tasks` during initialization  | SATISFIED  | `with_task_store()` inserts `tasks` into `experimental` capability map; test verifies value |
| INTG-02     | 03-01       | Tool-level task support declared via `execution.taskSupport` in tools/list          | SATISFIED  | `execution: Option<Value>` on ToolInfo; `tool_requires_task()` parses ToolExecution         |
| INTG-03     | 03-02       | Middleware intercepts tools/call with task field and creates task                   | SATISFIED  | Interception logic at lines 726-758 in core.rs before `handle_call_tool` is called          |
| INTG-04     | 03-02       | Returns CreateTaskResult immediately (external service handles background execution)| SATISFIED  | `return match task_router.handle_task_call(...).await` returns CreateTaskResult; no spawn    |
| INTG-05     | 03-02       | tasks/get endpoint returns current task state                                       | SATISFIED  | Routed at line 811 in core.rs; `handle_tasks_get` in router.rs; tested in lifecycle test    |
| INTG-06     | 03-02       | tasks/result endpoint returns operation result for terminal tasks                   | SATISFIED  | Routed at line 828; `handle_tasks_result` returns result + `_meta` with related-task link   |
| INTG-07     | 03-02       | tasks/list returns paginated tasks scoped to owner                                  | SATISFIED  | Routed at line 845; `handle_tasks_list` uses owner_id scoping; test verifies 2 tasks        |
| INTG-08     | 03-02       | tasks/cancel transitions non-terminal tasks to cancelled                            | SATISFIED  | Routed at line 862; `handle_tasks_cancel` calls `store.cancel()`; test verifies transition  |
| INTG-09     | 03-02       | TTL enforcement: receivers respect TTL, clean up expired tasks                      | SATISFIED  | `params.ttl` passed through `store.create()` in `handle_task_call`; TTL test passes (1ms)  |
| INTG-10     | 03-01       | JSON-RPC routing handles tasks/get, tasks/result, tasks/list, tasks/cancel          | SATISFIED  | Four match arms in core.rs (lines 811-877); test verifies -32601 when no router configured  |
| INTG-11     | 03-02       | progressToken from original request threaded to task variables                      | SATISFIED  | Extracted at lines 745-747 in core.rs; stored as `progress_token` variable in router.rs     |
| INTG-12     | 03-02       | Model immediate response via optional `_meta` in CreateTaskResult                   | SATISFIED  | `_meta: None` in CreateTaskResult struct; router leaves it None; type supports it           |
| TEST-08     | 03-03       | Full lifecycle integration tests (create -> poll -> complete -> get_result)         | SATISFIED  | 11/11 tests pass in lifecycle_integration.rs; all go through `ServerCore::handle_request()` |
| EXMP-01     | 03-03       | Basic task-augmented tool call example (60_tasks_basic.rs)                          | SATISFIED  | 204-line example compiles; demonstrates full lifecycle with educational output               |

**Orphaned requirements check:** REQUIREMENTS.md maps all INTG-01 through INTG-12, TEST-08, and EXMP-01 to Phase 3 — all are claimed in plans and verified above. No orphaned requirements.

---

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| None | —    | —       | —        | —      |

No anti-patterns detected in any phase 3 modified files.

**Note on pre-existing doctest failures:** `cargo test --package pmcp` reports 3 failing doctests in `src/server/preset.rs` and `src/shared/middleware_presets.rs` relating to the `streamable-http` feature flag. These failures pre-date phase 3 (they exist on commits before phase 3 began) and are not caused by any phase 3 changes. The pmcp-tasks package tests pass cleanly (54/54 tests including doctests).

---

### Human Verification Required

None — all observable behaviors are covered by the integration tests that run through real `ServerCore::handle_request()`. The example (`60_tasks_basic.rs`) could optionally be run manually to observe educational output:

**Optional: Run the example**
- Test: `cargo run --example 60_tasks_basic`
- Expected: 5-step lifecycle printed: task creation, status "working", background completion, status "completed", result with rows_processed/anomalies_found
- Why human: Visual output validation — automated compilation check already confirmed

---

### Gaps Summary

No gaps found. All 12 must-have truths verified, all 8 artifacts exist at substantive size and are properly wired, all 7 key links confirmed wired in source, all 14 requirement IDs satisfied with direct code evidence, zero anti-patterns detected, and 11/11 integration tests pass through the real ServerCore request path.

---

_Verified: 2026-02-21_
_Verifier: Claude (gsd-verifier)_
