Borrowing it
Nothing to install: this file belongs to tmux-python/libtmux-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.
curl -O https://raw.githubusercontent.com/tmux-python/libtmux-mcp/main/AGENTS.mdgit clone --depth 1 https://github.com/tmux-python/libtmux-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/tmux-python/libtmux-mcp/agents-md)<a href="https://agentmods.dev/instructions/tmux-python/libtmux-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/tmux-python/libtmux-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.
<a href="https://agentmods.dev/instructions/tmux-python/libtmux-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/tmux-python/libtmux-mcp/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 | $0.00862 | $0.00862 |
| Opus 5.5 | $0.00345 | $0.00345 |
| Sonnet 5.5 | $0.00172 | $0.00172 |
| Haiku 4.5 | $0.00086 | $0.00086 |
Grade A, and why
libtmux-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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 69 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
libtmux-mcp is a Model Context Protocol server that gives an AI agent programmatic control over tmux — sessions, windows, panes — built on libtmux.
Follow the conventions already in the tree, and keep a change scoped to what was asked for.
What is here
| Path | What it is |
|---|---|
src/libtmux_mcp/server.py |
FastMCP instance: construction, instructions, lifespan |
src/libtmux_mcp/middleware.py |
Toolset gating, response limiting, error mapping |
src/libtmux_mcp/_utils.py |
Server cache, object resolvers/serializers, handle_tool_errors |
src/libtmux_mcp/models.py |
Pydantic models for tool outputs |
src/libtmux_mcp/tools/ |
MCP tool implementations: one module per tmux object, plus batch/buffer/hook/wait_for |
src/libtmux_mcp/resources/ |
tmux:// URI resources for browsing the hierarchy |
src/libtmux_mcp/prompts/ |
MCP prompt templates |
scripts/mcp_swap.py |
Dev script: point agent CLI configs at a local checkout |
tests/ |
pytest suite; tests/docs/ covers doc-widget and topic contracts |
docs/ |
Sphinx source; docs/tools/ mirrors tools/, one page per tool |
CHANGES |
Changelog, included into the built docs/history.md page |
conftest.py |
Root doctest fixtures — see .github/WRITING.md |
Which policy applies
- Documentation, user-facing text,
CHANGES, release notes, commit messages, docstrings, and source comments: .github/WRITING.md - Environment, the gates, tests, documentation builds, releases, and pull requests: .github/CONTRIBUTING.md
Each of those is the single home for its subject. Where a rule seems to be stated twice, the file listed above is the one that governs.
Change discipline
- Make the smallest coherent change that solves the verified problem; keep unrelated cleanup out of it.
- Reuse an existing file, helper, API, or test before adding a new one.
- Add a file only for a durable boundary — a distinct responsibility, independent reuse, or splitting an oversized module — not for a single-use helper or a one-line re-export.
- Add a test for every user-visible behaviour change, and a
CHANGESentry for every change to a tool, resource, prompt, or configuration variable. - A passing gate is evidence only once it has been shown capable of failing. Pair a new test with a deliberate break that proves it bites.
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.
- 1mo ago First seen · 69 lines · 862 tokens per session scan A 21784c5fd269
libtmux-mcp AGENTS.md is an instructions file published in the GitHub repository tmux-python/libtmux-mcp (14 stars, last pushed 3d ago), licensed MIT. It adds 862 tokens to every session, about $0.0034 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.
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