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code-mode-mcp: Instructions file for Codex

AGENTS.md

code-mode-mcp AGENTS.md is an instructions file for Codex, OpenCode from tmustier/code-mode-mcp. It costs 214 tokens per session, scanned A, original, MIT.

Repository instructions for working on tmustier/code-mode-mcp, including its commands, limits, and handling of MCP tools.

In plain words
What is it for?
Use them when installing dependencies, checking types, running tests, preparing a release, or changing this repository.
Why use it?
They give an agent project-specific rules for testing, output, cancellation, secrets, generated code, and execution boundaries.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions Codex.

This is tmustier/code-mode-mcp's own configuration. It tells Codex and OpenCode how to work on code-mode-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything code-mode-mcp configures →

not rated 1repo 3mo ago A scan 214 tokens original MIT archived
View source ↗ tmustier/code-mode-mcp
Reuse

Borrowing it

Nothing to install: this file belongs to tmustier/code-mode-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/tmustier/code-mode-mcp/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/tmustier/code-mode-mcp

Made for: Codex, OpenCode.

Wrote 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.

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README.md
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Your own site
<a href="https://agentmods.dev/instructions/tmustier/code-mode-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/tmustier/code-mode-mcp/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.

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<a href="https://agentmods.dev/instructions/tmustier/code-mode-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/tmustier/code-mode-mcp/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 214 This file is loaded in full into every session.
When invoked 214 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00214 $0.00214
Opus 5.5 $0.00086 $0.00086
Sonnet 5.5 $0.00043 $0.00043
Haiku 4.5 $0.00021 $0.00021

Measured 2mo ago against content hash 7a91e529a92a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

code-mode-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 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.

AGENTS.md · 19 lines

What it actually says

Agent guide

Commands

  • Install: npm ci
  • Type-check: npm run check
  • Test: npm test
  • Full release check: npm run prepublishOnly

Boundaries

  • Keep the public surface compact: Code Mode is one exec MCP tool with in-code discovery.
  • Do not modify Pi or codex-computer-use-mcp from this repository.
  • Generated code intentionally has the same host authority as this Node process. node:vm is used for execution control, not as a security boundary.
  • The standalone stdio process is the fault-containment boundary. Do not add a child or isolate per execution without evidence that this boundary is insufficient.
  • Standard output is reserved for MCP. Diagnostics belong on standard error and must not include secrets or tool payloads.
  • Preserve nested MCP cancellation, progress, rich content, sampling, roots, and elicitation decisions. Never fabricate elicitation acceptance or rejection.
  • Keep tool outputs in memory. Do not persist intermediate tool results or screenshots.
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. 2mo ago First seen · 19 lines · 214 tokens per session scan A 7a91e529a92a

Subscribe to this mod's changes

code-mode-mcp AGENTS.md is an instructions file published in the GitHub repository tmustier/code-mode-mcp (1 stars, last pushed 3mo ago), licensed MIT. It adds 214 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.

Related

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