Borrowing it
Nothing to install: this file belongs to rixzkiye/codex-router. 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/rixzkiye/codex-router/main/AGENTS.mdgit clone --depth 1 https://github.com/rixzkiye/codex-routerWrote 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/rixzkiye/codex-router/agents-md)<a href="https://agentmods.dev/instructions/rixzkiye/codex-router/agents-md"><img src="https://agentmods.dev/badge/instructions/rixzkiye/codex-router/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/rixzkiye/codex-router/agents-md"><img src="https://agentmods.dev/badge/instructions/rixzkiye/codex-router/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 | $0.00221 | $0.00221 |
| Opus 5.5 | $0.00088 | $0.00088 |
| Sonnet 5.5 | $0.00044 | $0.00044 |
| Haiku 4.5 | $0.00022 | $0.00022 |
Grade A, and why
codex-router 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 2mo 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
Codex Router repository contract
Product invariants
- Keep MCP lifecycle calls bounded; a start call must never wait for turn completion.
- Append normalized runtime events before updating projections.
- Never replay a turn after semantic output, a command, a file mutation, an approval, or an external side effect is observed.
- Keep logical-agent, incarnation, runtime, thread, turn, and worktree identity separate.
- A write worktree has one persisted lease owner and a monotonically increasing fencing token.
- Runtime profiles contain secret references only. Never persist resolved credential or
CODEX_HOMEvalues. - Continuations retain runtime and thread affinity. Cross-runtime recovery is an explicit handoff with a new thread.
- Results label worker reports separately from router-observed evidence.
Verification
Run pnpm verify for the full local gate. Use focused pnpm vitest run <path> while iterating.
Protocol compatibility is pinned in src/runtime/codex-protocol.ts. Validate changes against generated types from the supported codex app-server before changing its request shapes.
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.
- 2mo ago First seen · 19 lines · 221 tokens per session scan A dce9ba86f00b
codex-router AGENTS.md is an instructions file published in the GitHub repository rixzkiye/codex-router (0 stars, last pushed 16d ago), licensed MIT. It adds 221 tokens to every session, about $0.0009 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 2026-08-31.
codex-router AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| codex-router AGENTS.mdrixzkiye/codex-router | Instructions file | 0 | 16d ago | MIT | A | 221 | 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 |