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.
npx agentmods add instructions/happenmass/codex-claude-code-mcp/agents-mdgit clone --depth 1 https://github.com/Happenmass/codex-claude-code-mcpWrote 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/happenmass/codex-claude-code-mcp/agents-md)<a href="https://agentmods.dev/instructions/happenmass/codex-claude-code-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/happenmass/codex-claude-code-mcp/agents-md.svg" alt="Measured on agentmods" 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 | $0.00205 | $0.00205 |
| Opus 5 | $0.00102 | $0.00102 |
| Sonnet 5 | $0.00041 | $0.00041 |
| Haiku 4.5 | $0.00020 | $0.00020 |
Grade A, and why
codex-claude-code-mcp 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 3d 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
Project Instructions
This project is a TypeScript ESM MCP server that exposes blocking Claude Code calls and read-only model discovery for Codex.
Design constraints:
- Do not add a poll/check tool. A run or resume call remains open until Claude Code finishes, fails, requests unsupported interaction, is cancelled, or reaches the configured runtime limit.
- Keep
claude_code_modelsread-only and free of model inference turns; it may initialize Claude Code only long enough to read the authenticated model catalog. - Keep stdout reserved for MCP stdio. Diagnostics go to stderr.
- Forward MCP request cancellation to the Claude Agent SDK query.
- Treat allowed tools as an explicit strict allowlist. Do not silently grant broader Claude Code permissions.
- Throttle progress notifications and keep final tool results compact.
- Preserve session IDs so callers can resume Claude Code context.
Before handoff, run:
npm run typechecknpm testnpm run buildnpm run smoke
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.
- 3d ago First seen · 21 lines · 205 tokens per session scan A fb6b12baef15
codex-claude-code-mcp AGENTS.md is an instructions file published in the GitHub repository Happenmass/codex-claude-code-mcp (0 stars, last pushed 1mo ago), licensed MIT. It adds 205 tokens to every session, about $0.0010 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 2026-08-31.
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