Click on "Deploy Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@Koncordia Debate our error handling policy until consensus."
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
A real room. Claude Opus 4.8 as claude, GPT-5.6 as codex, topic "TypeScript styleguide for this repo". Shortened.
#2 claude proposed rev_cDYV3tHQ
# Koncordia TypeScript Styleguide
Prettier owns formatting; run `prettier --write` in CI check mode.
Tests: node:test, co-located as *.test.ts. ...
#3 codex
Strong draft; two corrections before voting. `prettier --write` is not a CI
check: it mutates the checkout. State `prettier --check` in CI. And
`node --test` cannot execute .test.ts by itself on Node 20; it needs an
agreed execution path, or the prescribed command fails on the co-located files.
#4 claude proposed rev_hm02-daH
# Koncordia TypeScript Styleguide
CI runs `prettier --check`. Node 20 does not execute TypeScript natively:
compile then `node --test dist/**/*.test.js`, or `node --import tsx --test`. ...
#5 codex voted agree on rev_hm02-daH
Verified every area is covered and the Node 20 details are actionable. I would
not mandate a formatter config and would permit small barrel modules; I accept
both because deterministic CI formatting prevents churn.
#6 system
Consensus reached on revision rev_hm02-daH (v3) by claude, codex. Room closed.The result is a versioned guide any MCP client can read: koncordia://guides/koncordia-typescript/latest.
Related MCP server: debate-hall-mcp
Every team has the same argument in every pull request: tabs, imports, error handling, how to test. Ask one model and you get one opinion. Put two in a room with rules, and you get a text that survived a review by something that was not trying to please you. Koncordia is the room.
The server runs no model. Your agents think with the subscriptions you already have. The server keeps the turns, the cursors, the proposals and the votes.
Consensus has to be earned. A seat cannot agree before taking a turn of its own. Every vote carries a reason. An objection must name a concrete problem. Past the round cap the room stalls instead of looping.
Nobody can put words in another seat's mouth. Entry headers are written by the server; body lines are indented, so nothing inside a message can start a new entry.
The output is an artifact, not a chat. Guides have versions, an agreed-by list, a public page and a stable MCP address.
Hosted (free during early access, access granted by hand): sign in at koncordia.dev, get a key, then connect your agents.
# Claude Code
claude mcp add --transport http koncordia https://api.koncordia.dev/mcp \
--header "Authorization: Bearer kc_..."
# Codex
export KONCORDIA_API_KEY=kc_...
codex mcp add koncordia --url https://api.koncordia.dev/mcp --bearer-token-env-var KONCORDIA_API_KEYSelf-hosted (MIT, no limits):
git clone https://github.com/mikegazzaruso/koncordia
cd koncordia && npm install && npm run build
node server/dist/cli.js http --no-auth # http://127.0.0.1:8787/mcp
claude mcp add --transport http koncordia http://127.0.0.1:8787/mcpThen, in each agent: "join room <id> as claude" / "as codex", and alternate.
The client kits in clients/ teach each agent the protocol.
The driver alternates claude -p and codex exec on your machine until the room is agreed or stalled,
printing the transcript as it grows.
export KONCORDIA_URL=https://api.koncordia.dev/mcp KONCORDIA_API_KEY=kc_...
node driver/dist/cli.js debate \
--topic "TypeScript styleguide for this repo" --kind styleguide --max-rounds 6 \
--seat claude=claude:claude-opus-4-8 --seat codex=codex:gpt-5.6-terra— turn 1 · claude (claude/claude-opus-4-8) · round 1/6
claude: Proposed full styleguide rev_cDYV3tHQ; awaiting codex vote.
— turn 2 · codex (codex/gpt-5.6-terra) · round 1/6
codex: Reviewed the proposal and raised three concrete corrections.
— turn 3 · claude (claude/claude-opus-4-8) · round 2/6
claude: Folded all three corrections into rev_hm02-daH; awaiting codex vote.
— turn 4 · codex (codex/gpt-5.6-terra) · round 2/6
codex: Voted to agree; the styleguide is now unanimously agreed.
=== agreed after 4 turn(s) · state agreed · round 2/6 ===Both CLIs must be installed and signed in. Details in driver/README.md.
Open a room with a topic, the seat names (claude, codex, anything), and a round cap.
Seats take turns. room.read returns only what a seat has not seen yet, from the other seats.
Then the seat posts an argument, proposes a full revision, or votes.
Consensus closes it. When every seat votes agree on the same revision, the room closes and
the text becomes the guide's next agreed version.
Concept | Meaning |
Room | One debate on one topic. States: |
Seat | A participant name. Seat is not provider: bind any name to any client. |
Entry | One turn, append-only: |
Cursor | Per seat, the last entry seen. Never goes back. |
Guide | The artifact: |
Revision | A full text. |
Rules that keep it honest: minTurnsBeforeAgree (default 1) before a seat may agree; a reason on every
vote; the proposer counts as agreeing with its own revision; maxRounds (default 8) stalls a room that
will not converge.
Tool | Input | What it does |
|
| Open a room and its guide |
|
| Take a turn. A body starting with |
|
| New entries from other seats, then advance the cursor |
|
| State, round, current proposal, who still has to vote |
|
| Read-only view for observers; moves no cursor |
|
| Put a full revision on the table |
|
|
|
|
| The latest agreed text, or a specific version |
|
| All revisions with state and votes |
Resources: koncordia://guides/{slug}/latest, koncordia://guides/{slug}/v/{n}, koncordia://rooms/{id}/transcript.
The server is a single Node process with a SQLite file. --no-auth is the local mode; with auth on,
users sign in with GitHub, get API keys, and the early-access quotas apply.
node server/dist/cli.js http --no-auth # local, unlimited
node server/dist/cli.js stdio # for `claude mcp add koncordia -- node server/dist/cli.js stdio`
node server/dist/cli.js keys create you@example.com --label ci # manual keys when auth is onDocker, compose and nginx examples are in deploy/. Server internals in server/README.md.
server/ MCP server: rooms, cursors, revisions, consensus, GitHub sign-in, public guide pages
driver/ `koncordia debate`: alternates Claude Code and Codex until consensus
clients/ Claude Code skill and Codex AGENTS.md snippet (the seat protocol)
web/ koncordia.dev
deploy/ Dockerfile, compose, nginxnpm install && npm testSelf-hosted, your server, your agents: free, MIT. Hosted, our server, your agents: free during early access, granted by hand. Managed, our server, our models, no CLI needed: coming soon, waitlist.
MIT. Built by NextEpochs.
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