co-mono/packages/mom/CHANGELOG.md

Changelog

[Unreleased]

Added

• Working memory system with MEMORY.md files
  • Global workspace memory (workspace/MEMORY.md) shared across all channels
  • Channel-specific memory (workspace/<channel>/MEMORY.md) for per-channel context
  • Automatic memory loading into system prompt on each request
  • Mom can update memory files to remember project details, preferences, and context
• ISO 8601 date field in log.jsonl for easy date-based grepping
  • Format: "date":"2025-11-26T10:44:00.123Z"
  • Enables queries like: grep '"date":"2025-11-26' log.jsonl
• Centralized logging system (src/log.ts)
  • Structured, colored console output (green for user messages, yellow for mom activity, dim for details)
  • Consistent format: [HH:MM:SS] [context] message
  • Type-safe logging functions for all event types
• Usage tracking and cost reporting
  • Tracks tokens (input, output, cache read, cache write) and costs per run
  • Displays summary at end of each agent run in console and Slack thread
  • Example: 💰 Usage: 12,543 in + 847 out (5,234 cache read, 127 cache write) = $0.0234
• Working indicator in Slack messages
  • Channel messages show "..." while mom is processing
  • Automatically removed when work completes
• Improved stop command behavior
  • Separate "Stopping..." message that updates to "Stopped" when abort completes
  • Original working message continues to show tool results (including abort errors)
  • Clean separation between status and results

Changed

• Enhanced system prompt with clearer directory structure and path examples
• Improved memory file path documentation to prevent confusion
• Message history format now includes ISO 8601 date for better searchability
• System prompt now includes log.jsonl format documentation with grep examples
• System prompt now includes current date and time for date-aware operations
• Added efficient log query patterns using jq to prevent context overflow
• System prompt emphasizes limiting NUMBER of messages (10-50), not truncating message text
• Log queries now show full message text and attachments for better context
• Fixed jq patterns to handle null/empty attachments with (.attachments // [])
• Recent messages in system prompt now formatted as TSV (43% token savings vs raw JSONL)
• Enhanced security documentation with prompt injection risk warnings and mitigations
• Moved recent messages from system prompt to user message for better prompt caching
  • System prompt is now mostly static (only changes when memory files change)
  • Enables Anthropic's prompt caching to work effectively
  • Significantly reduces costs on subsequent requests
• Switched from Claude Opus 4.5 to Claude Sonnet 4.5 (~40% cost reduction)
• Tool result display now extracts actual text instead of showing JSON wrapper
• Slack thread messages now show cleaner tool call formatting with duration and label
• All console logging centralized and removed from scattered locations
• Agent run now returns { stopReason } instead of throwing exceptions
  • Clean handling of "aborted", "error", "stop", "length", "toolUse" cases
  • No more error-based control flow

Fixed

• jq query patterns now properly handle messages without attachments (no more errors on empty arrays)

[0.9.4] - 2025-11-26

Added

• Initial release of Mom Slack bot
• Slack integration with @mentions and DMs
• Docker sandbox mode for isolated execution
• Bash tool with full shell access
• Read, write, edit file tools
• Attach tool for sharing files in Slack
• Thread-based tool details (clean main messages, verbose details in threads)
• Single accumulated message per agent run
• Stop command (@mom stop) to abort running tasks
• Persistent workspace per channel with scratchpad directory
• Streaming console output for monitoring