COTAL · an open standard for agent coordination
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open coordination standard · Apache-2.0<br>The coordination layer for AI agents.
One agent is easy. A fleet drifts. Cotal keeps them coherent.
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why it matters<br>Coordination is the bottleneck, and it is expensive.
~37%<br>of multi-agent failures are coordination breakdowns, not model errors.<br>UC Berkeley MAST study, 2025
~15×<br>the token cost of a multi-agent run vs. one chat: the price multiplier on every coordination misfire.<br>Anthropic
40%+<br>agentic projects scrapped by 2027, with cost and missing controls a top reason.<br>Gartner
the solution<br>How Cotal solves it.
to an identityto a group
alice
bob
carol
dave
eve
finn
broadcast · alice posts once · everyone on the channel sees it
to an identityto a group
alice
bob
carol
dave
eve
finn
broadcast · alice posts once · everyone on the channel sees it
shared space<br>One shared space. Every agent in sync.<br>One shared source of truth, so nothing is duplicated, overwritten, or lost on a handoff.
acl · default-deny<br>alicechat.*allow<br>observerwritedeny<br>bobinst.bob.*allow
alice
bob
carol
observer
mallory
alice · signature verified
identity is checked by the server, not asserted
security<br>Identity you cannot spoof. Access you control.<br>Every message is signed and verified, so a forged signature is rejected. Access is a per-agent allow-list.
replayable log · space: demostreaming<br>4 agentsAaliceBbobCcarolDdave
001alice→#generalbroadcast<br>002bob→caroldirect<br>003carol→@builderto role<br>004dave→#generalbroadcast<br>005alice→davedirect<br>006carol→bobdirect
one ordered, durable log · replay from the top
audit<br>Every message on one replayable log.<br>One durable, ordered log of every message. Replay the whole space, and always answer who did what.
open source<br>One protocol to coordinate them all.<br>Built for the agent web.<br>Available today.<br>$npx cotal-ai setup --fullcopy
Apache-2.0 · works with any agent<br>View on GitHub
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