# Tasks: Project Schedule Tools

**Input**: Design documents from `/specs/001-schedule-tools/`
**Prerequisites**: plan.md, spec.md, research.md, data-model.md, contracts/

**Tests**: TDD is mandated by constitution - tests MUST be written and fail before implementation.

**Organization**: Tasks are grouped by user story to enable independent implementation and testing.

## Format: `[ID] [P?] [Story] Description`

- **[P]**: Can run in parallel (different files, no dependencies)
- **[Story]**: Which user story this task belongs to (US1, US2, US3, US4)
- Include exact file paths in descriptions

## Path Conventions

- **Source**: `src/xer_mcp/`
- **Tests**: `tests/`
- **Config**: `pyproject.toml`

---

## Phase 1: Setup (Shared Infrastructure)

**Purpose**: Project initialization and basic structure

- [ ] T001 Create project directory structure per plan.md in src/xer_mcp/
- [ ] T002 Initialize Python project with uv and create pyproject.toml with dependencies (mcp, pytest, pytest-asyncio, ruff)
- [ ] T003 [P] Configure ruff for linting and formatting in pyproject.toml
- [ ] T004 [P] Create src/xer_mcp/__init__.py with version 0.1.0
- [ ] T005 [P] Create tests/conftest.py with sample XER file fixtures

---

## Phase 2: Foundational (Blocking Prerequisites)

**Purpose**: Core infrastructure that MUST be complete before ANY user story can be implemented

**⚠️ CRITICAL**: No user story work can begin until this phase is complete

- [ ] T006 Create data models in src/xer_mcp/models/__init__.py (export all models)
- [ ] T007 [P] Create Project dataclass in src/xer_mcp/models/project.py
- [ ] T008 [P] Create Activity dataclass in src/xer_mcp/models/activity.py
- [ ] T009 [P] Create Relationship dataclass in src/xer_mcp/models/relationship.py
- [ ] T010 [P] Create PaginationMetadata dataclass in src/xer_mcp/models/pagination.py
- [ ] T011 Create SQLite schema in src/xer_mcp/db/schema.py with all tables and indexes
- [ ] T012 Create database connection manager in src/xer_mcp/db/__init__.py
- [ ] T013 Create MCP server skeleton in src/xer_mcp/server.py with stdio transport
- [ ] T014 Create base table handler abstract class in src/xer_mcp/parser/table_handlers/base.py
- [ ] T015 Create error types and NO_FILE_LOADED error in src/xer_mcp/errors.py

**Checkpoint**: Foundation ready - user story implementation can now begin

---

## Phase 3: User Story 1 - Load XER File (Priority: P1) 🎯 MVP

**Goal**: Parse XER files and load schedule data into SQLite database

**Independent Test**: Load a sample XER file and verify projects, activities, relationships are stored in SQLite

### Tests for User Story 1

> **NOTE: Write these tests FIRST, ensure they FAIL before implementation**

- [ ] T016 [P] [US1] Contract test for load_xer tool in tests/contract/test_load_xer.py
- [ ] T017 [P] [US1] Integration test for XER parsing in tests/integration/test_xer_parsing.py
- [ ] T018 [P] [US1] Integration test for multi-project handling in tests/integration/test_multi_project.py
- [ ] T019 [P] [US1] Unit test for XER parser in tests/unit/test_parser.py
- [ ] T020 [P] [US1] Unit test for table handlers in tests/unit/test_table_handlers.py

### Implementation for User Story 1

- [ ] T021 [US1] Create XER parser main class in src/xer_mcp/parser/xer_parser.py
- [ ] T022 [P] [US1] Create PROJECT table handler in src/xer_mcp/parser/table_handlers/project.py
- [ ] T023 [P] [US1] Create TASK table handler in src/xer_mcp/parser/table_handlers/task.py
- [ ] T024 [P] [US1] Create TASKPRED table handler in src/xer_mcp/parser/table_handlers/taskpred.py
- [ ] T025 [P] [US1] Create PROJWBS table handler in src/xer_mcp/parser/table_handlers/projwbs.py
- [ ] T026 [P] [US1] Create CALENDAR table handler in src/xer_mcp/parser/table_handlers/calendar.py
- [ ] T027 [US1] Create table handler registry in src/xer_mcp/parser/table_handlers/__init__.py
- [ ] T028 [US1] Create database loader in src/xer_mcp/db/loader.py to insert parsed data into SQLite
- [ ] T029 [US1] Implement load_xer MCP tool in src/xer_mcp/tools/load_xer.py
- [ ] T030 [US1] Register load_xer tool in src/xer_mcp/server.py
- [ ] T031 [US1] Add file-not-found and parse-error handling in src/xer_mcp/tools/load_xer.py
- [ ] T032 [US1] Add multi-project detection and selection logic in src/xer_mcp/tools/load_xer.py

**Checkpoint**: User Story 1 complete - XER files can be loaded and parsed

---

## Phase 4: User Story 2 - Query Project Activities (Priority: P1)

**Goal**: List and filter activities, get activity details with pagination

**Independent Test**: Load XER file, query activities with filters, verify pagination metadata

### Tests for User Story 2

> **NOTE: Write these tests FIRST, ensure they FAIL before implementation**

- [ ] T033 [P] [US2] Contract test for list_activities tool in tests/contract/test_list_activities.py
- [ ] T034 [P] [US2] Contract test for get_activity tool in tests/contract/test_get_activity.py
- [ ] T035 [P] [US2] Unit test for activity queries in tests/unit/test_db_queries.py

### Implementation for User Story 2

- [ ] T036 [US2] Create activity query functions with pagination in src/xer_mcp/db/queries.py
- [ ] T037 [US2] Implement list_activities MCP tool in src/xer_mcp/tools/list_activities.py
- [ ] T038 [US2] Implement get_activity MCP tool in src/xer_mcp/tools/get_activity.py
- [ ] T039 [US2] Register list_activities and get_activity tools in src/xer_mcp/server.py
- [ ] T040 [US2] Add NO_FILE_LOADED error check to activity tools in src/xer_mcp/tools/list_activities.py
- [ ] T041 [US2] Add date range filtering to list_activities in src/xer_mcp/tools/list_activities.py
- [ ] T042 [US2] Add WBS and activity_type filtering to list_activities in src/xer_mcp/tools/list_activities.py

**Checkpoint**: User Stories 1 AND 2 complete - activities are queryable

---

## Phase 5: User Story 3 - Query Activity Relationships (Priority: P2)

**Goal**: Query predecessors, successors, and full relationship network

**Independent Test**: Load XER file, query relationships for an activity, verify types and lags

### Tests for User Story 3

> **NOTE: Write these tests FIRST, ensure they FAIL before implementation**

- [ ] T043 [P] [US3] Contract test for list_relationships tool in tests/contract/test_list_relationships.py
- [ ] T044 [P] [US3] Contract test for get_predecessors tool in tests/contract/test_get_predecessors.py
- [ ] T045 [P] [US3] Contract test for get_successors tool in tests/contract/test_get_successors.py

### Implementation for User Story 3

- [ ] T046 [US3] Create relationship query functions in src/xer_mcp/db/queries.py
- [ ] T047 [US3] Implement list_relationships MCP tool in src/xer_mcp/tools/list_relationships.py
- [ ] T048 [US3] Implement get_predecessors MCP tool in src/xer_mcp/tools/get_predecessors.py
- [ ] T049 [US3] Implement get_successors MCP tool in src/xer_mcp/tools/get_successors.py
- [ ] T050 [US3] Register relationship tools in src/xer_mcp/server.py
- [ ] T051 [US3] Add NO_FILE_LOADED error check to relationship tools

**Checkpoint**: User Stories 1, 2, AND 3 complete - relationships are queryable

---

## Phase 6: User Story 4 - Query Project Summary (Priority: P3)

**Goal**: Get project overview, milestones, and critical path activities

**Independent Test**: Load XER file, get summary, list milestones, get critical path

### Tests for User Story 4

> **NOTE: Write these tests FIRST, ensure they FAIL before implementation**

- [ ] T052 [P] [US4] Contract test for get_project_summary tool in tests/contract/test_get_project_summary.py
- [ ] T053 [P] [US4] Contract test for list_milestones tool in tests/contract/test_list_milestones.py
- [ ] T054 [P] [US4] Contract test for get_critical_path tool in tests/contract/test_get_critical_path.py

### Implementation for User Story 4

- [ ] T055 [US4] Create summary query functions in src/xer_mcp/db/queries.py
- [ ] T056 [US4] Implement get_project_summary MCP tool in src/xer_mcp/tools/get_project_summary.py
- [ ] T057 [US4] Implement list_milestones MCP tool in src/xer_mcp/tools/list_milestones.py
- [ ] T058 [US4] Implement get_critical_path MCP tool in src/xer_mcp/tools/get_critical_path.py
- [ ] T059 [US4] Register summary tools in src/xer_mcp/server.py
- [ ] T060 [US4] Add NO_FILE_LOADED error check to summary tools

**Checkpoint**: All user stories complete - full MCP server functional

---

## Phase 7: Polish & Cross-Cutting Concerns

**Purpose**: Improvements that affect multiple user stories

- [ ] T061 [P] Integration test for edge cases in tests/integration/test_edge_cases.py
- [ ] T062 [P] Unit test for models in tests/unit/test_models.py
- [ ] T063 Add logging throughout src/xer_mcp/ modules
- [ ] T064 Run quickstart.md validation - test all documented examples
- [ ] T065 Add __main__.py entry point in src/xer_mcp/__main__.py
- [ ] T066 Final type checking with mypy and fix any issues
- [ ] T067 Run ruff format and fix any linting issues

---

## Dependencies & Execution Order

### Phase Dependencies

- **Setup (Phase 1)**: No dependencies - can start immediately
- **Foundational (Phase 2)**: Depends on Setup completion - BLOCKS all user stories
- **User Story 1 (Phase 3)**: Depends on Foundational - BLOCKS US2, US3, US4 (they need load_xer)
- **User Story 2 (Phase 4)**: Depends on US1 (needs loaded data to query)
- **User Story 3 (Phase 5)**: Depends on US1 (needs loaded data to query)
- **User Story 4 (Phase 6)**: Depends on US1 (needs loaded data to query)
- **Polish (Phase 7)**: Depends on all user stories being complete

### User Story Dependencies

- **US1 (Load XER)**: Foundation for all others - MUST complete first
- **US2 (Activities)**: Can start after US1 - independent of US3, US4
- **US3 (Relationships)**: Can start after US1 - independent of US2, US4
- **US4 (Summary)**: Can start after US1 - independent of US2, US3

### Within Each User Story

- Tests MUST be written and FAIL before implementation
- Models before services/queries
- Queries before MCP tools
- Core implementation before error handling
- Register tools in server.py after implementation

### Parallel Opportunities

**Phase 2 (Foundational)**:
```bash
# These can run in parallel:
Task T007: "Create Project dataclass"
Task T008: "Create Activity dataclass"
Task T009: "Create Relationship dataclass"
Task T010: "Create PaginationMetadata dataclass"
```

**Phase 3 (US1 - Table Handlers)**:
```bash
# These can run in parallel:
Task T022: "Create PROJECT table handler"
Task T023: "Create TASK table handler"
Task T024: "Create TASKPRED table handler"
Task T025: "Create PROJWBS table handler"
Task T026: "Create CALENDAR table handler"
```

**After US1 Complete (US2, US3, US4 can start in parallel)**:
```bash
# Developer A: User Story 2 (Activities)
# Developer B: User Story 3 (Relationships)
# Developer C: User Story 4 (Summary)
```

---

## Implementation Strategy

### MVP First (User Story 1 + 2)

1. Complete Phase 1: Setup
2. Complete Phase 2: Foundational
3. Complete Phase 3: User Story 1 (Load XER)
4. **STOP and VALIDATE**: Can load XER files successfully
5. Complete Phase 4: User Story 2 (Activities)
6. **MVP COMPLETE**: Can load XER and query activities

### Incremental Delivery

1. Setup + Foundational → Project ready
2. User Story 1 → XER files load → Demo loading
3. User Story 2 → Activities queryable → Demo activity queries
4. User Story 3 → Relationships queryable → Demo dependency analysis
5. User Story 4 → Summary available → Demo project overview
6. Polish → Production ready

### Parallel Team Strategy

With multiple developers after US1:
- Developer A: User Story 2 (list_activities, get_activity)
- Developer B: User Story 3 (relationships, predecessors, successors)
- Developer C: User Story 4 (summary, milestones, critical_path)

---

## Notes

- [P] tasks = different files, no dependencies on incomplete tasks
- [Story] label maps task to specific user story for traceability
- Constitution mandates TDD: write tests first, verify they fail, then implement
- Commit after each task or logical group
- Stop at any checkpoint to validate story independently
- All query tools must check for NO_FILE_LOADED condition