---
phase: 02-in-memory-backend-and-owner-security
verified: 2026-02-21T00:00:00Z
status: passed
score: 17/17 must-haves verified
gaps: []
human_verification: []
---

# Phase 2: In-Memory Backend and Owner Security Verification Report

**Phase Goal:** Developers can create, poll, update, and cancel tasks using an in-memory store with enforced owner isolation and security limits
**Verified:** 2026-02-21
**Status:** passed
**Re-verification:** No — initial verification

---

## Goal Achievement

### Observable Truths

| #  | Truth                                                                                              | Status     | Evidence                                                                                         |
|----|----------------------------------------------------------------------------------------------------|------------|--------------------------------------------------------------------------------------------------|
| 1  | InMemoryTaskStore implements all 11 TaskStore trait methods and compiles                           | VERIFIED   | `impl TaskStore for InMemoryTaskStore` at line 195 of memory.rs; `cargo clippy` clean            |
| 2  | Creating a task with owner A and retrieving with owner B returns NotFound (never OwnerMismatch)    | VERIFIED   | Lines 268-278 (get), 306-316 (update_status), 362-369 (set_variables), etc. in memory.rs        |
| 3  | Creating more tasks than max_tasks_per_owner returns ResourceExhausted error                      | VERIFIED   | Lines 213-219 in memory.rs; unit test `create_enforces_max_tasks_per_owner`; security_tests      |
| 4  | Requesting a TTL above max_ttl_ms returns an error (not silently clamped)                         | VERIFIED   | Lines 223-229 in memory.rs: hard reject with `TaskError::StoreError`; unit + store tests        |
| 5  | Anonymous access (empty/local owner) is rejected when allow_anonymous is false                    | VERIFIED   | Lines 170-176 in memory.rs (`check_anonymous_access`); 4 anonymous_access_tests pass            |
| 6  | State transitions are validated atomically within the DashMap entry                               | VERIFIED   | `get_mut` used in update_status/complete_with_result/set_variables; transition before commit     |
| 7  | Variable merge applies null-deletion semantics and checks size after merge                        | VERIFIED   | Lines 383-408 in memory.rs: clone-check-commit pattern; null removes key; size checked post-merge|
| 8  | resolve_owner_id returns OAuth subject > client_id > session_id > 'local' in priority order      | VERIFIED   | security.rs lines 174-198; 10 unit tests all pass                                               |
| 9  | TaskContext is Clone + Send + Sync and wraps Arc<dyn TaskStore>                                   | VERIFIED   | context.rs line 93: `#[derive(Clone)]`; field is `Arc<dyn TaskStore>` (requires Send+Sync)      |
| 10 | TaskContext provides typed variable accessors (get_string, get_i64, get_f64, get_bool, get_typed) | VERIFIED   | context.rs lines 217-309; 32 context_tests all pass including type-mismatch -> Ok(None) cases   |
| 11 | TaskContext provides status transition convenience methods (complete, fail, require_input)        | VERIFIED   | context.rs lines 432-552; transition_tests 10 tests all pass                                    |
| 12 | TaskContext complete() uses store's atomic complete_with_result                                   | VERIFIED   | context.rs line 434: delegates to `store.complete_with_result`; test_complete_is_atomic passes  |
| 13 | Store CRUD tests verify all 11 methods                                                            | VERIFIED   | store_tests.rs: 34 tests in crud_tests, pagination_tests, ttl_tests, concurrency_tests; all pass|
| 14 | Pagination tests verify cursor-based list with limits and multiple pages                          | VERIFIED   | pagination_tests in store_tests.rs: 6 tests; cursor flow verified end-to-end                    |
| 15 | Security tests verify owner isolation, anonymous rejection, max tasks, UUID entropy               | VERIFIED   | security_tests.rs: 19 tests in 4 modules; test_task_ids_unique_across_1000_creations passes     |
| 16 | Property tests verify state machine invariants, variable merge, task ID uniqueness, owner isolation | VERIFIED | property_tests.rs: 4 new Phase 2 property tests + 9 Phase 1 tests = 13 total; all pass          |
| 17 | Concurrent access tests verify no data corruption under parallel operations                       | VERIFIED   | concurrency_tests in store_tests.rs: 3 tests using tokio::spawn; all pass                       |

**Score:** 17/17 truths verified

---

### Required Artifacts

| Artifact                                         | Expected                                              | Status     | Details                                                         |
|--------------------------------------------------|-------------------------------------------------------|------------|-----------------------------------------------------------------|
| `crates/pmcp-tasks/src/store/memory.rs`          | InMemoryTaskStore with DashMap + full TaskStore impl  | VERIFIED   | 1387 lines; 11 trait methods + builders + unit tests            |
| `crates/pmcp-tasks/src/security.rs`              | TaskSecurityConfig + resolve_owner_id                 | VERIFIED   | 315 lines; struct, defaults, builders, function, 11 unit tests  |
| `crates/pmcp-tasks/src/store/mod.rs`             | Module organization with `pub mod memory`             | VERIFIED   | Line 21: `pub mod memory;` present; trait intact from Phase 1   |
| `crates/pmcp-tasks/src/context.rs`               | TaskContext ergonomic wrapper                         | VERIFIED   | 563 lines; Clone derive; Arc<dyn TaskStore> field; all methods  |
| `crates/pmcp-tasks/tests/context_tests.rs`       | TEST-03 integration tests (32 tests)                  | VERIFIED   | 32 tests in variable_tests, transition_tests, identity_tests    |
| `crates/pmcp-tasks/tests/store_tests.rs`         | TEST-04 store CRUD/pagination/TTL/concurrency tests   | VERIFIED   | 34 tests in 4 modules; all pass                                 |
| `crates/pmcp-tasks/tests/security_tests.rs`      | TEST-06 security enforcement tests                    | VERIFIED   | 19 tests in 4 modules; all pass                                 |
| `crates/pmcp-tasks/tests/property_tests.rs`      | TEST-07 Phase 2 property tests appended               | VERIFIED   | 4 new tests added after Phase 1 tests; section comment present  |

---

### Key Link Verification

| From                              | To                         | Via                                              | Status     | Details                                                     |
|-----------------------------------|----------------------------|--------------------------------------------------|------------|-------------------------------------------------------------|
| `store/memory.rs`                 | `store/mod.rs`             | `impl TaskStore for InMemoryTaskStore`           | WIRED      | Line 195: `impl TaskStore for InMemoryTaskStore`            |
| `store/memory.rs`                 | `security.rs`              | `self.security` in create()                      | WIRED      | Lines 210, 213, 214: security checked in create()          |
| `store/memory.rs`                 | `error.rs`                 | `TaskError::NotFound` on owner mismatch          | WIRED      | Lines 275, 313, 368, 432, 480, 529: NotFound returned      |
| `context.rs`                      | `store/mod.rs`             | `Arc<dyn TaskStore>` field                       | WIRED      | Line 95: `store: Arc<dyn TaskStore>`                       |
| `context.rs`                      | `store/memory.rs`          | tests use InMemoryTaskStore as backing store     | WIRED      | context_tests.rs line 24: `Arc::new(InMemoryTaskStore::new())` |
| `tests/context_tests.rs`          | `context.rs`               | `TaskContext::new` exercised in all tests        | WIRED      | Line 33: `TaskContext::new(store.clone(), ...)` in helper  |
| `tests/store_tests.rs`            | `store/memory.rs`          | `InMemoryTaskStore::new` in all tests            | WIRED      | Line 17: `test_store()` helper uses `InMemoryTaskStore::new()` |
| `tests/security_tests.rs`         | `security.rs`              | `TaskSecurityConfig` used directly               | WIRED      | Lines 25-30: `TaskSecurityConfig` in `store_with_max_tasks` |
| `tests/property_tests.rs`         | `store/memory.rs`          | `proptest!` closures use InMemoryTaskStore       | WIRED      | Lines 264, 294, 327, 353: store operations in proptest     |

---

### Requirements Coverage

| Requirement | Source Plan | Description                                                                          | Status    | Evidence                                                                          |
|-------------|-------------|--------------------------------------------------------------------------------------|-----------|-----------------------------------------------------------------------------------|
| STOR-05     | 02-01       | In-memory backend implements TaskStore with HashMap + synchronization                | SATISFIED | `impl TaskStore for InMemoryTaskStore` with DashMap; all 11 methods implemented  |
| STOR-06     | 02-01       | In-memory backend validates state machine transitions atomically                     | SATISFIED | `get_mut` + `validate_transition` within DashMap entry lock in update_status     |
| STOR-07     | 02-01       | In-memory backend supports configurable poll interval and max TTL                   | SATISFIED | `with_poll_interval()` builder; max_ttl_ms enforced in create(); default applied |
| HNDL-02     | 02-01       | Task variables surfaced to client via `_meta` in task responses                      | SATISFIED | `to_wire_task_with_variables()` in record.rs injects into `_meta`; from Phase 1  |
| HNDL-03     | 02-01       | Variable merge semantics: new keys added, existing overwritten, null deletes         | SATISFIED | memory.rs lines 383-404: null removes, non-null upserts; size checked            |
| HNDL-04     | 02-02       | TaskContext provides get_variable, set_variable, set_variables, variables methods    | SATISFIED | context.rs lines 185-399: all 4 variable methods implemented                     |
| HNDL-05     | 02-02       | TaskContext provides require_input, fail, complete convenience methods               | SATISFIED | context.rs lines 432-552: complete, fail, require_input, resume, cancel          |
| HNDL-06     | 02-02       | TaskContext is Clone and wraps Arc<dyn TaskStore>                                    | SATISFIED | `#[derive(Clone)]`; field `store: Arc<dyn TaskStore>`; Send+Sync implicit        |
| SEC-01      | 02-01       | Owner ID resolved from OAuth sub claim, client ID, or session ID (priority order)   | SATISFIED | resolve_owner_id() in security.rs: subject > client_id > session_id > "local"   |
| SEC-02      | 02-01       | Every task operation enforces owner matching                                         | SATISFIED | All 7 owner-touching methods check `record.owner_id != owner_id`; return NotFound|
| SEC-03      | 02-01       | tasks/list scoped to requesting owner only                                           | SATISFIED | list() filters by `options.owner_id` before returning; security_tests verify    |
| SEC-04      | 02-01       | TaskSecurityConfig with configurable max_tasks_per_owner (default: 100)              | SATISFIED | TaskSecurityConfig: max_tasks_per_owner=100 default; builder to change           |
| SEC-05      | 02-01       | TaskSecurityConfig with configurable max_ttl_ms (default: 24 hours)                 | SATISFIED | StoreConfig.max_ttl_ms=86_400_000ms; enforced in create(); no silent clamping   |
| SEC-06      | 02-01       | TaskSecurityConfig with configurable default_ttl_ms (default: 1 hour)               | SATISFIED | StoreConfig.default_ttl_ms=3_600_000ms applied when ttl=None in create()        |
| SEC-07      | 02-01       | TaskSecurityConfig with allow_anonymous toggle (default: false)                     | SATISFIED | TaskSecurityConfig.allow_anonymous=false default; check_anonymous_access()       |
| SEC-08      | 02-01       | Task IDs use UUIDv4 (122 bits of entropy) to prevent guessing                       | SATISFIED | TaskRecord::new uses uuid::Uuid::new_v4(); UUID entropy tests pass (1000 unique) |
| TEST-03     | 02-02       | TaskContext behavior tests (variable CRUD, status transitions, complete with result) | SATISFIED | 32 tests in context_tests.rs; all pass                                           |
| TEST-04     | 02-03       | In-memory store tests (CRUD, pagination, TTL, concurrent access)                    | SATISFIED | 34 tests in store_tests.rs; all pass                                             |
| TEST-06     | 02-03       | Security tests (owner isolation, anonymous rejection, max tasks, UUID entropy)       | SATISFIED | 19 tests in security_tests.rs; all pass                                          |
| TEST-07     | 02-03       | Property tests (status transitions, variable merge, task ID uniqueness, owner iso.) | SATISFIED | 4 new Phase 2 + 9 Phase 1 = 13 proptest tests; all pass                         |

**All 20 requirements satisfied.**

Note on HNDL-02 and HNDL-03: These are listed in the Plan 02-01 `requirements` frontmatter and the REQUIREMENTS.md traceability table marks them as Phase 2 and "Pending" (pre-verification). Implementation evidence confirms:
- HNDL-02: `to_wire_task_with_variables()` in `domain/record.rs` injects variables into Task `_meta`. The method existed from Phase 1 but the store integration in Phase 2 makes it functional.
- HNDL-03: Null-deletion merge semantics implemented in `InMemoryTaskStore::set_variables()` (memory.rs lines 383-404), verified by unit tests and property tests.

---

### Anti-Patterns Found

No anti-patterns detected.

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

Scan covered:
- `crates/pmcp-tasks/src/**/*.rs`: zero TODO/FIXME/HACK/PLACEHOLDER comments
- `crates/pmcp-tasks/src/**/*.rs`: zero `unimplemented!()` calls
- `crates/pmcp-tasks/src/**/*.rs`: zero empty `return null` / `return {}` stub returns

---

### Human Verification Required

None. All behaviors verified programmatically:
- Owner isolation: code paths and test assertions checked
- Security limits: unit tests + integration tests pass with exact error types
- Atomicity: DashMap entry-lock pattern confirmed in source; tests verify no partial state
- Clippy: zero warnings (both production and test code)

---

### Commits Verified

All commits from summaries confirmed in git log:

| Commit  | Description                                                |
|---------|------------------------------------------------------------|
| `6da3ab7` | feat(02-01): add TaskSecurityConfig and owner resolution  |
| `be34791` | feat(02-01): implement InMemoryTaskStore with full TaskStore trait |
| `3b0513c` | feat(02-02): implement TaskContext ergonomic wrapper       |
| `087d41f` | test(02-02): add TEST-03 integration tests for TaskContext |
| `df4ecbc` | test(02-03): add store CRUD, pagination, TTL, concurrency tests |
| `089a6d0` | test(02-03): add security tests and extend property tests  |

---

### Test Suite Summary

| Test File              | Count | Result |
|------------------------|-------|--------|
| Unit tests (src/)      | 136   | all pass |
| context_tests.rs       | 32    | all pass |
| store_tests.rs         | 34    | all pass |
| security_tests.rs      | 19    | all pass |
| property_tests.rs      | 13    | all pass |
| **Total**              | **234**   | **all pass** |

Clippy: zero warnings (with `-D warnings` flag, including `--tests`)

---

### Gaps Summary

None. All phase goal aspects achieved:

- **Create**: `InMemoryTaskStore::create()` enforces anonymous check, max tasks, TTL limits, applies default TTL, returns Working task with UUID v4 ID.
- **Poll (get)**: `get()` returns task even if expired; owner isolation enforced; expired mutations rejected.
- **Update**: `update_status()` validates state machine transitions atomically within DashMap entry lock.
- **Cancel**: `cancel()` delegates to `update_status(Cancelled)` with owner check.
- **Owner isolation**: NotFound (never OwnerMismatch) for all 7 owner-sensitive operations.
- **Security limits**: max_tasks_per_owner (ResourceExhausted), max_ttl_ms (hard reject), allow_anonymous (StoreError).
- **TaskContext**: ergonomic wrapper with typed accessors and atomic complete.
- **Tests**: 234 tests passing across unit, integration, and property test suites.

---

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