peac AGENTS.md

Project instructions for PEAC Protocol, a system for proving who made an agent interaction and verifying signed records of what happened.

In plain words
What is it for?
Use them when working on signed interaction receipts, agent identity, HTTP proof methods, policy metadata, or MCP tool responses.
Why use it?
They explain the project's identity, proof, policy-discovery, and tool-integration rules so changes follow the protocol.

Instructions file for CodexOpenCode

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add instructions/peacprotocol/peac/agents-md
Clone the repo
git clone --depth 1 https://github.com/peacprotocol/peac

Made for: Codex, OpenCode.

Per session 1,155 This file is loaded in full into every session.
When invoked 1,155 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.01155 $0.01155
Opus 5 $0.00577 $0.00577
Sonnet 5 $0.00231 $0.00231
Haiku 4.5 $0.00115 $0.00115

Measured 2d ago against content hash ca67f636a52b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

peac AGENTS.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

AGENTS.md · 129 lines

How it starts

The opening of the file, as written. The whole thing — 129 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Agent-readable metadata for PEAC Protocol. Last reviewed: 2026-06-24

Identity

  • Protocol: PEAC (wire formats: interaction-record+jwt (current), peac-receipt/0.1 (frozen legacy))
  • Specification: https://www.peacprotocol.org
  • Key Discovery: iss -> /.well-known/peac-issuer.json -> jwks_uri -> JWKS
  • Algorithm: EdDSA (Ed25519)

Capabilities

  • Receipt Issuance and Verification: Signed receipts (interaction-record+jwt JWS) for verifiable interaction evidence
  • Purpose Declaration: Structured intent via PEAC-Purpose header
  • Agent Identity: Proof-of-control binding (see AGENT-IDENTITY.md)
  • Policy Discovery: Machine-readable terms at /.well-known/peac.txt

Proof Methods

Method Standard Description
http-message-signature RFC 9421 HTTP Message Signatures
dpop RFC 9449 DPoP token binding
mtls RFC 8705 Mutual TLS client certificate
jwk-thumbprint RFC 7638 JWK Thumbprint confirmation

MCP Integration

PEAC receipts attach to MCP tool responses via the Evidence Carrier Contract.

JSON-RPC Response (_meta carrier):

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "content": [...],
    "_meta": {
      "org.peacprotocol/receipt_ref": "sha256:abc123...",
      "org.peacprotocol/receipt_jws": "eyJhbGciOiJFZERTQSIsInR5cCI6ImludGVyYWN0aW9uLXJlY29yZCtqd3QiLC..."
    }
  }
}

HTTP Transport:

PEAC-Receipt: eyJhbGciOiJFZERTQSIsInR5cCI6ImludGVyYWN0aW9uLXJlY29yZCtqd3QiLC...

The PEAC-Receipt header carries a compact JWS (never a bare receipt_ref).

A2A Agent Card Extension

For A2A (Agent-to-Agent Protocol, Linux Foundation) discovery via /.well-known/agent-card.json:

Agent Card (capabilities.extensions[] array, A2A v1.0.0):

Read the full file on GitHub · 129 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 129 lines · 1,155 tokens per session scan A ca67f636a52b

Subscribe to this mod's changes

peac AGENTS.md is an instructions file published in the GitHub repository peacprotocol/peac (14 stars, last pushed 10d ago), licensed Apache-2.0. It adds 1,155 tokens to every session, about $0.0058 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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