feat: Implement comprehensive agent command interface for Slack

[StuartF303]

Summary

Implements a complete natural language command interface for managing the agent pool through Slack, covering 7 user stories with 30+ commands.

This PR delivers a production-ready command interface with comprehensive test coverage (217 tests), security features, performance monitoring, and complete documentation.

User Stories Implemented

✅ US1: Agent Discovery

• list agents - List all connected agents with metadata
• status [agent-id] - Pool overview or specific agent status
• ping all - Ping all connected agents

✅ US2: Direct Messaging

• @<agent-id> <message> - Send direct message to agent
• broadcast <message> - Broadcast to all agents
• ask <agent-id> <question> - Ask question to agent

✅ US3: Work Queue Inspection

• queue <agent-id> - Display task queue for agent
• tasks - Display all tasks grouped by agent
• cancel <task-id> - Cancel specific task

✅ US4: Task Assignment

• assign <agent-id> <description> - Create and assign task with UUID
• priority <task-id> <level> - Update task priority (high/medium/low or 1-5)

✅ US5: Agent Configuration

• config <agent-id> model <model> - Change agent model
• config <agent-id> role <role> - Change agent role
• config <agent-id> queue-limit <n> - Change queue capacity (1-1000)
• config <agent-id> show - Display all settings
• pause <agent-id> - Pause agent (stops accepting tasks)
• resume <agent-id> - Resume agent

✅ US6: Monitoring & Debugging

• logs <agent-id> [n] - Retrieve log entries (default 50)
• metrics <agent-id> - Display task counts and metrics
• errors - Show recent errors across all agents
• history <agent-id> - Display completed tasks with durations

✅ US7: System Management

• help - Display all available commands
• version - Show version information
• restart <agent-id> - Restart specific agent
• shutdown <agent-id> - Shutdown specific agent

Architecture

Command Infrastructure

• CommandRegistry: Central command dispatcher with fuzzy matching and Levenshtein distance for typo suggestions
• CommandParser: Natural language parsing with input sanitization and performance monitoring
• SlackFormatter: Consistent message formatting (tables, sections, code blocks, lists)
• ResponseBuilder: Message truncation and formatting utilities

Command Handlers (7 modules)

• DiscoveryCommands: Agent discovery and status
• CommunicationCommands: Direct messaging and broadcast
• QueueCommands: Task queue inspection
• AssignmentCommands: Task assignment and priority management
• ConfigCommands: Agent configuration and lifecycle
• MonitoringCommands: Logs, metrics, errors, history
• SystemCommands: Help, version, system management

Supporting Components

• TaskManager: Multi-agent task queue management with per-agent capacity limits
• Enhanced Agent.ts: Added PAUSED status for pause/resume functionality
• Extended Message protocol: Added DIRECT_MESSAGE and BROADCAST types

Features

🔒 Security & Validation

• Input sanitization (removes control characters, enforces length limits)
• Command logging with userId and timestamp (audit trail)
• Agent existence validation for all commands
• Argument count validation (min/max enforcement)
• Paused agent checks prevent task assignment

🎯 User Experience

• Fuzzy command matching with Levenshtein distance
• Typo suggestions for unknown commands (e.g., "lst" → "Did you mean: list?")
• Helpful error messages with actionable suggestions
• Consistent emoji indicators (✅ success, ❌ error, 💡 suggestion)
• Slack markdown formatting for readability

⚡ Performance

• Parse time monitoring (warns if >50ms)
• Efficient command lookup (O(1) hash map)
• Response truncation for large outputs (40,000 char Slack limit)
• Optimized table rendering for large agent lists

Test Coverage

Integration Tests: 61 tests ✅

• Agent Discovery: 10 tests
• Direct Messaging: 6 tests
• Queue Inspection: 8 tests
• Task Assignment: 9 tests
• Agent Configuration: 12 tests
• Monitoring & Debugging: 10 tests
• System Management: 7 tests

Unit Tests: 156 tests ✅

• CommandParser: 8 tests
• CommandRegistry: 12 tests
• DiscoveryCommands: 25 tests
• CommunicationCommands: 21 tests
• QueueCommands: 17 tests
• AssignmentCommands: 15 tests
• ConfigCommands: 22 tests
• MonitoringCommands: 19 tests
• SystemCommands: 13 tests
• Additional: 4 tests

Total: 217 tests passing ✅

Files Changed

New Files (27)

• 7 command handler files (src/commands/handlers/)
• 8 unit test files (tests/unit/commands/)
• 1 integration test suite (tests/integration/command-interface.test.ts)
• 4 command infrastructure files (Registry, Parser, types, formatters)
• 1 TaskManager component
• 6 specification documents (specs/001-agent-command-interface/)

Modified Files (4)

• Agent.ts: Added PAUSED status
• Message.ts: Added DIRECT_MESSAGE and BROADCAST types
• index.ts: Integration points
• CLAUDE.md: Complete command reference documentation

Statistics

• 36 files changed
• 10,397 lines added
• ~4,000 lines of production code
• ~2,500 lines of test code

Documentation

✅ Updated CLAUDE.md with complete command reference organized by category
✅ Added comprehensive specification in specs/001-agent-command-interface/:

• spec.md - Feature requirements and user stories
• plan.md - Technical architecture and implementation approach
• data-model.md - Entity definitions (Command, Agent, Task, etc.)
• contracts/ - JSON schema for command validation
• quickstart.md - Quick start guide with example usage
• research.md - Technical decisions and rationale
• tasks.md - Complete task breakdown (all 117 tasks completed ✅)

Breaking Changes

None. This is a new feature addition with no impact on existing functionality.

Testing Instructions

1. Run all tests:

   cd packages/mcp-server
   npm test

2. Run integration tests only:

   npm test -- tests/integration/command-interface.test.ts

3. Run unit tests for specific handler:

   npm test -- tests/unit/commands/DiscoveryCommands.test.ts

4. Manual testing (after Slack integration):

   • Connect to Slack workspace
   • Try each command category
   • Verify error handling with invalid inputs
   • Test fuzzy matching with typos

Future Enhancements

These are intentionally left for future work:

• Persistence for agent configuration changes
• Actual protocol messaging for restart/shutdown commands
• Performance benchmarks with 100+ mock agents
• Rate limiting for command execution
• Command history and autocomplete
• Rich UI components (buttons, dropdowns) for Slack

Checklist

• All tests passing (217/217)
• Code follows project conventions
• Documentation updated (CLAUDE.md)
• No breaking changes
• Security considerations addressed
• Performance monitoring in place
• Error handling comprehensive
• Specification complete

Related Issues

Closes #[issue-number] (if applicable)

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Ready for review! This PR represents a complete, production-ready implementation of the agent command interface. All 7 user stories are implemented, tested, and documented.

🚀 Generated with Claude Code