hcom — realtime messaging + context sharing for AI coding agents

What is hcom?

Local message bus + event log. Agents message each other, share transcripts, get notified on events, and spawn new agents. Messages arive when agents are active and idle.

pip install hcom
hcom claude                     #launch
hcom codex
hcom gemini
hcom                            # TUI dashboard

Features

Messaging – send to all or @mention specific agents hcom send --help

Transcripts – read other agent’s conversation history hcom transcript --help

Subscriptions – get notified when events match (real-time file collisions, agent idle, shell commands) hcom events --help

Spawn – launch agents into new terminals hcom 3 claude | HCOM_TAG=team hcom 2 gemini (group) | hcom claude -p "task" (headless)

Workflow Scripts – pre-built workflows (background reviewer, debate, clone, ensemble) hcom run --help

Cross-device – connect agents across machines via HuggingFace relay hcom relay --help

Config – terminal, tags, hints, timeouts hcom config | hcom config terminal --info (set any terminal)

Quick Setup

Check current state:

hcom status

After hcom hooks add: You MUST restart your AI tool for hooks to activate.

Verify participation:

hcom list

Same pattern for [GEMINI]/[gemini]/[gemini*] and [CODEX]/[codex]/[codex*].

The asterisk * means hooks aren’t active for this session. Close and reopen the AI tool.

Starting hcom

Option A – Launch with hcom (recommended):

hcom claude       # or: hcom gemini, hcom codex

Option B – Connect existing session:

Run hcom start

Using hcom

Send messages: Talk to agents naturally – “send a message to gemini saying check the tests”

TUI dashboard: hcom (no args) – event stream, broadcast, status, launch

Troubleshooting

“hcom not working”

hcom status          # Check installation
hcom hooks status    # Check hooks specifically

Hooks missing? hcom hooks add then restart tool.

Still broken?

hcom reset all && hcom hooks add
# Close all claude/codex/gemini/hcom windows
hcom claude          # Fresh start

“messages not arriving”

1. Check recipient: hcom list – are they listening or active?
2. Check message sent: hcom events --sql "type='message'" --last 5
3. Check TUI – shows delivery blockers:
   • Agent processing (not listening)
   • User typing (delivery pauses)
   • Uncommitted text in prompt
   • Tool in submenu/not at prompt
4. Recipient shows [claude*]? They need to restart their AI tool

“identity not found”

Run hcom start first, or use hcom claude to launch with automatic identity.

Sandbox / Permission Issues

export HCOM_DIR="$PWD/.hcom"     # Project-local mode
hcom hooks add                   # Installs to project dir

Fresh Start

hcom reset all # arhive db, reset config, remove hooks, stop all agents
pip uninstall hcom && pip install hcom
# Restart AI tool

Tool Support

Files

With HCOM_DIR set, uses that path instead of ~/.hcom.

Archives & Reset

hcom reset archives the database and starts fresh. Similar to /clear in AI tools.

• Interactive agents get “stopped” but terminal stays open – can reclaim with hcom start --as NAME
• Headless agents get killed

Query archives:

hcom archive            # List (lowest = most recent)
hcom archive 1          # Query most recent

Remove hcom

hcom hooks remove # Safely remove only hcom hooks/config from all tool settings files

More Info

hcom --help              # All commands
hcom <command> --help    # Command details
hcom run docs            # Full CLI + config + API reference

GitHub: https://github.com/aannoo/hcom