| name | hcom-agent-messaging |
| description | Multi-agent communication for AI coding tools. Agents message, watch, and spawn each other across terminals. Use when setting up hcom, troubleshooting delivery, or writing multi-agent scripts.
|
hcom — multi-agent communication for AI coding tools
AI agents running in separate terminals are isolated. hcom connects them via hooks and a shared database so they can message, watch, and spawn each other in real-time.
curl -fsSL https://github.com/aannoo/hcom/releases/latest/download/hcom-installer.sh | sh
hcom claude
hcom
what humans can do
tell any agent:
send a message to claude
when codex goes idle send it the next task
watch gemini's file edits, review each and send feedback if any bugs
fork yourself to investigate the bug and report back
find which agent worked on terminal_id code, resume them and ask why it sucks
what agents can do
Message each other in real-time, bundle context for handoffs.
Observe each other: transcripts, file edits, terminal screens, command history.
Subscribe to each other: notify on status changes, file edits, specific events. React automatically.
Spawn, fork, resume, kill each other, in any terminal emulator.
run hcom --help for full command syntax and flags.
tool support
| tool | delivery | connect |
|---|
| claude code (incl. subagents) | automatic | hcom claude |
| gemini cli (>= 0.26.0) | automatic | hcom gemini |
| codex | automatic | hcom codex |
| opencode | automatic | hcom opencode |
| kilo code | automatic | hcom kilo |
| antigravity | automatic | hcom agy |
| cursor | automatic | hcom cursor-agent |
| any other ai tool | manual via hcom listen | hcom start (run inside tool) |
session binding (hcom transcript, hcom r/f by session id) happens on first message or first prompt for all hcom-launched tools.
setup
if the user invokes this skill without arguments:
- run
hcom status — if "command not found", install first:
curl -fsSL https://github.com/aannoo/hcom/releases/latest/download/hcom-installer.sh | sh
- run
hcom hooks add to install hooks for all detected tools
- restart the AI tool for hooks to activate
| status output | meaning | action |
|---|
| command not found | not installed | install via brew install aannoo/hcom/hcom, the curl installer above, or pip install hcom |
[~] claude | tool exists, hooks not installed | hcom hooks add then restart |
[✓] claude | hooks installed | ready |
[✗] claude | tool not found | install the AI tool first |
troubleshooting
"hcom not working"
hcom status
hcom hooks status
hcom relay status
hooks missing? hcom hooks add then restart tool.
still broken?
hcom reset all && hcom hooks add
hcom claude
"messages not arriving"
| symptom | diagnosis | fix |
|---|
agent not in hcom list | agent stopped or never bound | relaunch or wait for binding |
| message sent but not delivered | check hcom events --last 5 | verify @mention matches agent name/tag |
| message reaches more than one agent | duplicate base name across tags | target the full @tag-name to hit exactly one |
| messages leaking between workflows | no thread isolation | always use --thread |
intent system
agents follow these rules from their bootstrap:
--intent request -> agent always responds--intent inform -> agent responds only if useful--intent ack -> agent does not respond
sandbox / permission issues
export HCOM_DIR="$PWD/.hcom"
hcom hooks add
workflow scripting
place scripts in ~/.hcom/scripts/ as .sh or .py. run with hcom run <name> "task". see references/script-template.md for the full annotated template, or run hcom run docs --scripts inside an agent.
key rules
- never use
sleep — use hcom events --wait or hcom listen
- never hardcode agent names — parse from
grep '^Names: ' in launch output
- always use
--thread — without it, messages leak across workflows
- always use
trap cleanup ERR INT TERM — orphan headless agents run indefinitely
- always use
hcom kill for cleanup (not stop) — kill also closes the terminal pane
- always forward
--name — hcom injects it, scripts must propagate it
- always use
--go on launch/kill — without it, scripts hang on confirmation prompt
agent topologies
| topology | agents | pattern |
|---|
| worker-reviewer | 2 | worker sends result, reviewer reads transcript, sends APPROVED/FIX |
| pipeline | N sequential | each stage reads previous via hcom transcript, signals via thread |
| ensemble | N+1 (judge) | N agents answer independently, judge reads all via hcom events --sql |
| hub-spoke | 1+N | coordinator broadcasts to @tag-, workers report back |
| reactive | N | hcom events sub triggers agent actions on file edits/status changes |
files
| what | location |
|---|
| database | ~/.hcom/hcom.db |
| config | ~/.hcom/config.toml |
| logs | ~/.hcom/.tmp/logs/ |
| user scripts | ~/.hcom/scripts/ |
with HCOM_DIR set, uses that path instead of ~/.hcom.
reference files
| file | when to read |
|---|
references/patterns.md | writing multi-agent scripts — 6 tested patterns with full code and real event JSON |
references/cross-tool.md | claude + codex + gemini + opencode collaboration details and per-tool quirks |
references/gotchas.md | debugging scripts — timing, message delivery, intent system, cleanup |
references/script-template.md | writing a new script from scratch — full template with commentary |
references/scripts/ | 6 tested, working example scripts |
more info
hcom --help
hcom <command> --help
github: https://github.com/aannoo/hcom
