# Concordia Protocol

> Structured negotiation protocol for autonomous agents. Gives your agent binding commitments, multi-attribute offers (basic, partial, conditional, bundle), session receipts, portable reputation, and agent discovery — all as MCP tools. Supports a six-state session lifecycle with Ed25519-signed, hash-chained message transcripts.

## Facts
- Page: https://tashan.sh/capability/plugin-eriknewton-concordia-protocol-concordia-protocol
- tashan id: plugin:eriknewton/concordia-protocol/concordia-protocol
- Source: https://github.com/eriknewton/concordia-protocol
- Type: plugin
- Category: other
- tashan score: 46.0 / 100
- Adoption: 15.0
- Upkeep: 92.0
- Freshness: 83.0
- Evidence coverage: 84% of the inputs this score can use
- Health: active
- Instruction depth: solid
- GitHub stars: 3
- License: Apache-2.0
- Official: no

## Install

```sh
/plugin marketplace add anthropics/claude-plugins-community
/plugin install concordia-protocol@claude-community
```

## Security audit
Not scanned. We audit npm-published capabilities; this one has no npm package we can resolve, or has not reached the queue. This is not a clean bill of health.

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Measured 2026-09-13 by tashan (https://tashan.sh) from public evidence. Scorer s5.