Borrowing it
Nothing to install: this file belongs to Semeton/agent-contract. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Semeton/agent-contract/master/AGENTS.mdgit clone --depth 1 https://github.com/Semeton/agent-contractWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/semeton/agent-contract/agents-md)<a href="https://agentmods.dev/instructions/semeton/agent-contract/agents-md"><img src="https://agentmods.dev/badge/instructions/semeton/agent-contract/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/semeton/agent-contract/agents-md"><img src="https://agentmods.dev/badge/instructions/semeton/agent-contract/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00371 | $0.00371 |
| Opus 5.5 | $0.00148 | $0.00148 |
| Sonnet 5.5 | $0.00074 | $0.00074 |
| Haiku 4.5 | $0.00037 | $0.00037 |
Grade A, and why
agent-contract 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 4d 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.
What it actually says
Agent Contract — ALWAYS ACTIVE
Enforcement here is mechanical, not advisory: PreToolUse hooks read .agent/ and exit
non-zero to block a write. These rules hold whether or not the prompt mentions them.
- Declare a role before writing source. Run
.agent/checks/pre-generate.sh <spec.json> <role>— it validates the spec and sets the active role. Roles: generator integrator tester reviewer debugger documenter security. No role declared → source writes are blocked. - Stay in your role's scope.
.agent/roles/<role>.yamllists the writable globs; an empty list means read-only. - Contract files are off-limits in-session —
.agent/roles/**,.agent/checks/**,.agent/session/active-role.txt,.claude/settings*. Change those out-of-band: a human edit oragent-contract update. - Fix only what was asked (
refactor_policy: forbidden_unless_explicitly_approved). - Ask when inputs are ambiguous — do not fill in defaults.
- Decisions go in
docs/decisions/, where a human reviews them, not in a log. Add an ADR asdocs/decisions/NNNN-<title>.md;agent-contract checkrequires one for sensitive changes.
Available context — read what the task needs, there is no required reading order:
.agent/manifest.yaml (contract index), .agent/memory/codebase-map.md (file index),
.agent/conventions.yaml (style policy), .agent/memory/handoff-*.md (prior sessions).
Handoff notes are written for you by the Stop hook.
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.
- 4d ago Changed · +35 tokens per session 8ec3ae3764ba
- 2mo ago First seen · 21 lines · 336 tokens per session scan A d94b16feff58
agent-contract AGENTS.md is an instructions file published in the GitHub repository Semeton/agent-contract (21 stars, last pushed 4d ago), licensed MIT. It adds 371 tokens to every session, about $0.0015 per session on Opus 5.5. 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.
agent-contract AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| agent-contract AGENTS.mdSemeton/agent-contract | Instructions file | 21 | 4d ago | MIT | A | 371 | Claude Code, Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |