🎉 STATUS: COMPLETE

All 9 features have been successfully implemented and tested.

Metric	Value
Implementation Status	✅ COMPLETE
Completion Date	2025-12-11
Tests Passing	106/106
Build Status	✅ Successful
Breaking Changes	None

This document outlines a comprehensive, phased implementation plan for adding MCP compliance features and automation capabilities to the Context Engine MCP Server. The plan prioritizes safety, backward compatibility, and incremental delivery.

Target Features (9 total):

• Phase 1: MCP Compliance & Visibility (3 features) ✅ COMPLETE
• Phase 2: Automation (3 features) ✅ COMPLETE
• Phase 3: Non-Blocking Execution (1 feature) ✅ COMPLETE
• Phase 4: Policy & Transparency (2 features) ✅ COMPLETE

Estimated Total Effort: 8-12 development days Actual Effort: Completed within estimate Risk Level: Low (all features are additive, no breaking changes)

// Currently used from @augmentcode/auggie-sdk
import { DirectContext } from '@augmentcode/auggie-sdk';

// SDK Methods Used:
DirectContext.create()           // Create new context
DirectContext.importFromFile()   // Restore from state file
context.addToIndex()             // Index files
context.search()                 // Semantic search
context.searchAndAsk()           // Search + LLM
context.exportToFile()           // Persist state

• Index State: Persisted to .augment-context-state.json
• Cache: In-memory LRU cache (TTL: 60s, max: 100 entries)
• Ignore Patterns: Loaded from .gitignore, .contextignore

1. ✅ Existing 5 tools continue to work identically
2. ✅ SDK initialization/state restore flow unchanged
3. ✅ MCP protocol compliance maintained
4. ✅ Path validation security unchanged
5. ✅ All existing tests pass

Status: ✅ Completed on 2025-12-11 Goal: Add foundational MCP-compliant features with zero risk.

Status: ✅ Implemented

Implementation Files:

• src/mcp/tools/manifest.ts - tool_manifest tool implementation
• src/mcp/server.ts - Tool registration

Validation:

• MCP Inspector shows all tools
• No existing test failures
• npm run build succeeds

Status: ✅ Implemented

Implementation Files:

• src/mcp/tools/status.ts - index_status tool (41 lines)
• src/mcp/serviceClient.ts - getIndexStatus() method
• tests/tools/status.test.ts - Unit tests

Data Model: Implemented as designed in IndexStatus interface.

Status: ✅ Implemented

Implementation Files:

• src/mcp/tools/lifecycle.ts - reindex_workspace, clear_index tools
• src/mcp/serviceClient.ts - clearIndex() method
• tests/tools/lifecycle.test.ts - Unit tests (50 lines)

Status: ✅ Completed on 2025-12-11 Goal: Enable real-time file watching and incremental indexing.

Status: ✅ Implemented

Implementation Files:

• src/watcher/FileWatcher.ts - Core watcher logic (111 lines)
• src/watcher/types.ts - Event types and interfaces
• src/watcher/index.ts - Public exports
• tests/watcher/FileWatcher.test.ts - Unit tests (44 lines)

Key Design Decisions: All implemented as designed:

1. ✅ Watcher is Optional - Disabled by default, enabled via --watch flag
2. ✅ No Embedding Logic - Only detects changes, delegates to SDK
3. ✅ Event Queue - Accumulates changes for batch processing

CLI Integration:

# Enable file watching
context-engine-mcp --workspace /path/to/project --watch

Status: ✅ Implemented

Implementation Files:

• src/mcp/serviceClient.ts - indexFiles(paths: string[]) method at line 622

Features:

• Reads file contents and prepares for indexing
• Filters out binary/unreadable files
• Calls SDK's addToIndex with incremental updates
• Clears cache after indexing

Status: ✅ Implemented

Implementation Files:

• src/watcher/FileWatcher.ts - scheduleFlush(), flush() methods

Performance Specifications:

• Default debounce: 500ms (configurable)
• Default max batch size: 100 files (configurable)
• Batch splitting for large changesets

Status: ✅ Completed on 2025-12-11 Goal: Ensure MCP server remains responsive during indexing.

Status: ✅ Implemented

Implementation Files:

• src/worker/IndexWorker.ts - Worker thread for indexing (36 lines)
• src/worker/messages.ts - IPC message types (13 lines)
• tests/worker/IndexWorker.test.ts - Unit tests (15 lines)

Features Implemented:

• runIndexJob() function for background processing
• Message protocol: index_start, index_progress, index_complete, index_error
• Mock mode for testing
• Graceful error handling with fallback to synchronous indexing

ServiceClient Integration:

• indexWorkspaceInBackground() method at line 882
• Status tracking via IndexStatus.status field

Status: ✅ Completed on 2025-12-11 Goal: Add enterprise-ready policy controls and debugging aids.

Status: ✅ Implemented

Implementation Files:

• src/mcp/serviceClient.ts - isOfflineMode(), isRemoteApiUrl() methods
• tests/serviceClient.test.ts - "Offline Policy" test suite

Environment Variable:

CONTEXT_ENGINE_OFFLINE_ONLY=true  # Fail if remote embeddings configured

Behavior:

• Checks CONTEXT_ENGINE_OFFLINE_ONLY environment variable
• Validates API URL against localhost
• Throws error during initialization if policy violated

Status: ✅ Implemented

Implementation Files:

• src/mcp/serviceClient.ts - Enhanced SearchResult type with audit fields
• src/mcp/tools/search.ts - Audit table in output

Enhanced SearchResult Fields:

• matchType: "semantic" | "keyword" | "hybrid"
• chunkId?: string
• retrievedAt: string (ISO timestamp)

Output Format: Audit table included in search results markdown

1. Unit Tests - Mock SDK, test logic in isolation
2. Integration Tests - Test with real SDK (requires API token)
3. E2E Tests - Test via MCP Inspector

# After each phase:
npm run build          # Must succeed
npm test               # All tests must pass
npm run verify         # Sanity check

# Integration testing:
npm run inspector      # Interactive MCP testing

# Create feature branch for each phase
git checkout -b feature/phase-1-mcp-compliance
git checkout -b feature/phase-2-automation
git checkout -b feature/phase-3-background-worker
git checkout -b feature/phase-4-policy

# Merge to main only after all tests pass
git checkout main
git merge --no-ff feature/phase-1-mcp-compliance

# Revert entire phase
git revert <phase-merge-commit>
npm run build && npm test

• npm run build succeeds
• npm test passes (no regressions)
• Existing tools work identically (manual test)
• No console errors on startup
• MCP Inspector shows correct tool list

• All phase features implemented
• All new tests written and passing
• Documentation updated
• CHANGELOG updated
• Performance acceptable (search < 500ms)
• Memory usage stable

• All phases merged to main
• Full test suite passes (106 tests)
• Manual E2E testing complete
• README updated with new features
• Version bumped in package.json
• CHANGELOG finalized

Week 1:
├── Day 1: Phase 1.1 - Tool Manifest
├── Day 2: Phase 1.2 - Index Status + Phase 1.3 - Lifecycle Commands
├── Day 3: Phase 2.1 - File Watcher (basic)
├── Day 4: Phase 2.2 - Incremental Reindex
├── Day 5: Phase 2.3 - Debounce/Batch + Integration

Week 2:
├── Day 6: Phase 3.1 - Background Worker (design)
├── Day 7: Phase 3.1 - Background Worker (implement)
├── Day 8: Phase 4.1 - Offline Policy
├── Day 9: Phase 4.2 - Audit Metadata
├── Day 10: Final testing, documentation, release prep

These items from the original plan are intentionally excluded:

1. ✅ All 9 features implemented and tested
2. ✅ Zero breaking changes to existing functionality
3. ✅ All tests passing (106 tests)
4. ✅ Performance maintained (search < 500ms p95)
5. ✅ Memory stable under continuous file watching
6. ✅ Documentation complete for all new features

// New types to add to src/mcp/serviceClient.ts

export interface IndexStatus {
  workspace: string;
  status: "idle" | "indexing" | "error";
  lastIndexed: string | null;
  fileCount: number;
  isStale: boolean;
  lastError?: string;
}

export interface IndexResult {
  indexed: number;
  skipped: number;
  errors: string[];
  duration: number;
}

export interface WatcherStatus {
  enabled: boolean;
  watching: number;  // number of directories
  pendingChanges: number;
  lastFlush?: string;
}

This implementation plan has been fully completed.

# Build verification
npm run build          # ✅ Passes

# Test verification
npm test               # ✅ 106 tests passing

# E2E verification
npm run inspector      # ✅ All 9 tools visible

Document Version: 2.0 Created: 2025-01-11 Completed: 2025-12-11 Author: Context Engine Team