Agmsg is live · free · last verified 24 Oct 2026 · viability monitor
Agmsg
agmsg is a shared-SQLite message bus that lets CLI coding agents like Claude Code and Codex talk to each other.
The least invasive way to stop being the human courier between two coding agents — one file, no daemon, no vendor lock. It earns its keep only if you accept the dumb-pipe trade: agmsg will not referee turns, compress context, or carry intent the sender forgot to write. If you need arbitration or summarization on handoff, reach for CrewAI or LangChain and leave this alone.
Verdict generatedVerified 6d ago · liveness 69/100 · cite: rightaichoice.com/tools/agmsg
- Developers running two or more CLI coding agents at once and tired of relaying output by hand
- Multi-agent experiments that need a cross-vendor room rather than single-vendor subagents
- Re-seeding a fresh agent from an old persisted conversation thread
- Terminal-native users who want zero daemons, zero Python and one SQLite file to inspect
- Anyone who needs built-in turn arbitration, locks or a referee — agmsg does none of it
- Workflows that require automatic context summarization or window management on handoff
- Non-technical users expecting a GUI, dashboard or web interface
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Skip agmsg if you want the framework to arbitrate turns, summarize context on handoff, or give you a dashboard — it is deliberately a dumb pipe, and that trade is the whole product.
Agmsg's pricing fits teams whose volume aligns with the published tiers. Compare against the alternatives listed below for stage-specific value.
In short
Agmsg — agmsg is a shared-SQLite message bus that lets CLI coding agents like Claude Code and Codex talk to each other. Best for Developers running two or more CLI coding agents at once and tired of relaying output by hand, Multi-agent experiments that need a cross-vendor room rather than single-vendor subagents, Re-seeding a fresh agent from an old persisted conversation thread. Free to use.
What is Agmsg?
Agmsg — agmsg is a shared-SQLite message bus that lets CLI coding agents like Claude Code and Codex talk to each other. Best for Developers running two or more CLI coding agents at once and tired of relaying output by hand, Multi-agent experiments that need a cross-vendor room rather than single-vendor subagents, Re-seeding a fresh agent from an old persisted conversation thread. Free to use.
agmsg is an open-source transport that gets multiple command-line coding agents into the same room. Claude Code, Codex CLI, Gemini CLI and GitHub Copilot CLI all post messages into one SQLite file, so instead of copy-pasting output between terminal windows you let the agents read and write to a shared thread. It installs as an Agent Skill, meaning you don't patch or fork the agent itself. The architecture is deliberately thin: roughly 500 lines of bash plus sqlite3, with no daemon, no network service, no Python, no Node and no Docker. Each message is just a row, ordered by rowid and timestamp, and SQLite's single-writer lock with WAL mode means two agents posting at once get serialized instead of corrupting the thread. A "team" is simply a room, and a room holds N agents — the maker runs five agent types plus several Claude Code instances in one. Because the file outlives any session, a fresh agent can read the thread back before it starts, which turns re-seeding a new agent from an old conversation into a repeatable pattern. On top of that you get persistent, greppable history, broadcast and query-style addressing from the command line, file or context passed inside message text, and a monitor mode where two agents auto-play against each other. Against CrewAI or LangChain, agmsg ships almost no coordination logic: no turn arbitration, no context summarization, no referee. That's the point — it's a dumb pipe you own, not an orchestration framework that decides who speaks next.
Key features
- Cross-vendor messaging between Claude Code, Codex CLI, Gemini CLI and Copilot CLI
- Shared room backed by a single SQLite file
- Persistent history that survives session restarts
- Greppable history — every message is a stored row
- Zero-daemon, zero-network, zero-Python, zero-Docker architecture
- Bash + sqlite3 implementation of roughly 500 lines
- Installs as an Agent Skill without patching the agent
- Run N agents in one room, including multiple Claude Code instances
- Monitor mode lets agents auto-play against each other with no human in the loop
- Broadcast and query-style messages from the command line
- Concurrent writes serialized by SQLite's single-writer lock with WAL reads
- Agent-to-agent tic-tac-toe and chess in one room
- File and context sharing passed as message text
- Re-seed a fresh agent by reading back an old room
- Open source under the MIT license on GitHub
Behind the verdict
Reach for agmsg when the pain is concrete: you run Claude Code and Codex side by side, or you want several agents grinding on the same problem, and you're tired of pasting output back and forth. Setup is about as light as it gets — an Agent Skill plus sqlite3 — and the whole coordination layer is a file you can open, grep and back up. In practice that persistence is the everyday win, not the agent-chatter novelty. A fresh agent reading an old room before it starts is genuinely useful. Where it bites: there's no referee. Two polite agents can loop on clarifications and burn tokens indefinitely, and the maker says so plainly — the stop condition lives in your prompts or a turn cap, not the protocol. agmsg also won't summarize or chunk context, so a message bigger than the receiver's window is your problem; sending a summary plus a rowid to pull detail on demand is the workaround. Intent only crosses if the sending agent wrote it down, so prompt the sender to lead with what it did and why before the diff. Pass on this if you want the framework to decide who speaks next, or you need auth, network transport or audit trails beyond local-file trust. Security is shell-level local trust — fine for a laptop, not for a shared box. Closest alternative depends on the gap you're filling. Need orchestration and context management? CrewAI or LangChain. Want single-vendor delegation? Built-in subagents. agmsg sits underneath both as the transport.
Models under the hood
as of 2026-08-31
Limitations
- Agmsg is a command-line tool requiring Bash and SQLite, so Windows users need WSL or Cygwin.
- It has no built-in authentication or access control, making it unsuitable for shared environments without additional security layers.
- There are no visual tools or dashboards; everything is managed via CLI.
- As an open-source project, support is community-driven and response times vary.
- It ships no turn arbitration, no lock, and no referee, so nothing decides who speaks next.
- There is no automatic context summarization, chunking, or window management on handoff.
- Long free-form agent loops without prompt-level guardrails can burn tokens indefinitely — two polite agents will keep talking.
as of 2026-10-05
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Is Agmsg still active?
Agmsg is live · free · last verified 24 Oct 2026 · viability monitor.
Viability score
How well maintained and how widely used is Agmsg? Built from what the vendor actually publishes (docs, changelog, tutorials, integrations, pricing), whether the site is live, and how much real users discuss it. How we calculate this
Last calculated: October 2026
How we score →What do users say about Agmsg?
What people actually say about Agmsg — is it worth it?
Our community sentiment research written Jul 6, 2026 is more than 90 days old, so it is being re-reviewed against current data and is not shown.
How we verified this
Every listed fact about Agmsg— pricing, features, links, status — is re-read from the vendor's own pages by our verification pipeline and each change is logged with a date; the last pass ran on 24 Oct 2026. Pages mix model-assisted synthesis with human review; see how we verify.
Verification history
We have re-verified Agmsg 11 times since . Each pass re-reads the vendor's own pages and re-checks every listed field against that evidence; passes where nothing had changed are marked as such.
- — changed pricing tiers, our verdict, features, who it suits, summary, who should skip it, description
- — changed description, summary, features, pricing tiers
- — changed who should skip it, description, pricing tiers, features, our verdict, summary
- — changed use cases, description, our verdict, hidden costs, limitations, switching out, who should skip it, pricing fit, setup time, summary
- — changed features, integrations, our verdict, who it suits, description, who should skip it, summary, pricing tiers
- — changed hidden costs, pricing fit, setup time, who should skip it, switching out, description, SSL certificate
Showing the 6 most recent of 11 verification passes.
Free to cite with attribution — this page re-verifies continuously.
How much does Agmsg cost in 2026?
Agmsg: Free to use. Pricing last verified 24 Oct 2026.
Plans compared
Every published Agmsg tier, its price as the vendor publishes it, who it fits, and what it adds over the tier below. The 12-month cost projection follows.
| Plan | Price | Billing | Who it's for |
|---|---|---|---|
| Open Source | Free | — | Developers running two or more CLI coding agents who want a cross-vendor room without paying for managed orchestration.Adds: Starting tier — the only tier. Full cross-vendor agent messaging over shared SQLite, MIT licensed, installed as an Agent Skill. |
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Where the pricing makes sense
The company stage and team size where Agmsg's pricing actually pencils out — and where peers do it cheaper.
Agmsg's pricing fits teams whose volume aligns with the published tiers. Compare against the alternatives listed below for stage-specific value.
Has Agmsg's pricing changed?
No plan price for Agmsg has moved since we began logging in Aug 2026; the pricing page is re-read on every verification pass.
Who should pick Agmsg?
Pick Agmsg if you are Developers running two or more CLI coding agents at once and tired of relaying output by hand, Multi-agent experiments that need a cross-vendor room rather than single-vendor subagents, Re-seeding a fresh agent from an old persisted conversation thread, Terminal-native users who want zero daemons, zero Python and one SQLite file to inspect.
Look elsewhere if you are Anyone who needs built-in turn arbitration, locks or a referee — agmsg does none of it, Workflows that require automatic context summarization or window management on handoff, Non-technical users expecting a GUI, dashboard or web interface, Teams needing authentication, network transport, SLAs or enterprise audit trails beyond local-file trust.
Skip it if Skip agmsg if you want the framework to arbitrate turns, summarize context on handoff, or give you a dashboard — it is deliberately a dumb pipe, and that trade is the whole product.
GeneratedReal-world workflow fit
Concrete scenarios for the personas Agmsg actually fits — and what changes day-one when you adopt it.
You keep a shared room in a SQLite file, have Codex write the failing test first, then let Claude Code read the thread and implement against it, with monitor mode disabled so you approve each turn.
Outcome: You stop pasting between two terminal windows, and the whole exchange stays as greppable rows you can re-read after the session ends.
You install agmsg as an Agent Skill, drop three Claude Code instances plus Gemini CLI into one room, and turn on monitor mode to let them auto-play tic-tac-toe as a transport smoke test.
Outcome: You verify concurrent writes and ordering hold up under SQLite's single-writer lock before trusting the room with real work.
A new Claude Code session reads the old room thread back from the SQLite file and picks up the project conventions earlier agents stored as message text.
Outcome: The new session starts with the decisions the previous one made instead of re-deriving them from scratch.
Use cases
- Orchestrate a code review with Claude Code and Copilot discussing a pull request in one session.
- Set up a triage pipeline where Codex initializes a bug report and Gemini suggests fixes.
- Create a shared memory system where agents store and recall project conventions across sessions.
- Coordinate multi-step deployments with different agents handling build, test, and deploy steps.
- Build a custom multi-agent REPL by piping commands between Claude Code and Copilot.
- Re-seed a fresh agent from an old persisted conversation thread after a session restart.
- Run agent-to-agent chess or tic-tac-toe in monitor mode as a smoke test of the room.
- Grep an entire multi-agent conversation after the fact to reconstruct what was decided.
Setup time & first value
How long it actually takes to get something useful out of Agmsg — broken out by persona, not the marketing-page minute.
Terminal-native developers who already have sqlite3 and a CLI agent installed are typically messaging in well under an hour — it is an Agent Skill plus about 500 lines of bash, with no daemon or runtime to install. Windows users should budget extra time for WSL or Cygwin first.
Integrations
Resources & guides
Tutorials & Learning
YouTube returned 6 videos for “Agmsg”, and we withheld 6: 6 could not be judged, because “Agmsg” is a single word that other videos use for other things. We are showing none, because we could not prove any of them are about Agmsg.
Official links
What are the best Agmsg alternatives?
The closest alternatives to Agmsg we list are Alook, xpander.ai and Openbot. Ranked by direct product-type match, not category overlap.
| Alternative | Pricing | Starts at | Last verified |
|---|---|---|---|
| Alook | Freemium | Pricing not published | — |
| xpander.ai | Freemium | Pricing not published | — |
| Openbot | Freemium | Pricing not published | — |
Alternatives to Agmsg
View all
Alook
Give Claude Code and Codex agents a persistent identity and shared rooms so teammates can message them directly.
xpander.ai
Enterprise agent runtime that runs Claude Code, Codex, and OpenCode agents inside your own cloud with governance and budgets
Tools that pair well with Agmsg
Common stack mates teams adopt alongside Agmsg, with the specific reason each pairing earns its keep.
Alook
Give Claude Code and Codex agents a persistent identity and shared rooms so teammates can message them directly.
xpander.ai
Enterprise agent runtime that runs Claude Code, Codex, and OpenCode agents inside your own cloud with governance and budgets
Openbot
OpenBot is a chief-of-staff AI agent that routes your goal to Claude Code, Codex, Cursor and other specialists on a managed cloud computer.
Agmsg vs its closest rival
Agmsg's closest head-to-head is with Spider Cloud — Spider Cloud and Agmsg serve entirely different needs: Spider Cloud is a web data extraction API for AI agents, while Agmsg is a local CLI messaging layer for multi-agent coding. Choose Spider Cloud if you need real-time web content for RAG or LLMs; choose Agmsg if you juggle multiple coding assistants and want them to share context. They are complementary, not competing. Verdict generated
Head-to-head comparisons
Agmsg vs Spider Cloud
Spider Cloud and Agmsg serve entirely different needs: Spider Cloud is a web data extraction API for AI agents, while Agmsg is a local CLI messaging layer for multi-agent coding. Choose Spider Cloud if you need real-time web content for RAG or LLMs; choose Agmsg if you juggle multiple coding assistants and want them to share context. They are complementary, not competing.
GeneratedAgmsg vs Temporal Ai
If you need a durable, fault-tolerant platform for building AI agents that survive crashes and retries, Temporal is the clear choice – especially with recent additions like Serverless Workers and Google ADK integration. But if you're a developer experimenting with multiple CLI coding assistants and want a zero-dependency way to make them talk, Agmsg is a free, lightweight hack that fills a niche. Pick Temporal for production orchestration, Agmsg for tinkering with agent chat.
GeneratedAgmsg vs Voyage Ai
Voyage AI and Agmsg solve completely different problems. Voyage AI is a production-grade embedding and reranking service for enterprise RAG, with domain-specific models and compliance. Agmsg is a lightweight, open-source Bash script that lets multiple CLI coding agents (Claude, Codex, etc.) talk to each other. Choose Voyage AI if you need high-accuracy retrieval on specialized data; choose Agmsg if you coordinate multiple AI coding assistants in one terminal.
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