Borrowing it
Nothing to install: this file belongs to nvlang/verso-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/nvlang/verso-mcp/main/AGENTS.mdgit clone --depth 1 https://github.com/nvlang/verso-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/nvlang/verso-mcp/agents-md)<a href="https://agentmods.dev/instructions/nvlang/verso-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/nvlang/verso-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/nvlang/verso-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/nvlang/verso-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 | $0.02795 | $0.02795 |
| Opus 5.5 | $0.01118 | $0.01118 |
| Sonnet 5.5 | $0.00559 | $0.00559 |
| Haiku 4.5 | $0.00280 | $0.00280 |
Grade A, and why
verso-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.
How it starts
The opening of the file, as written. The whole thing — 204 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
Guidance for AI agents (and humans) asked to maintain or modify this repository.
This file follows the AGENTS.md convention — a plain
Markdown file of instructions that agentic coding tools read before working in a
repo. It is the canonical maintenance guide for verso-mcp; if anything
here conflicts with a guess or a habit, this file wins.
The owner wants this repository to need near-zero ongoing maintenance. Most "maintenance" (dependency bumps) is automated and should require no human or agent action. Read the relevant section below before changing anything, keep changes small, and do not invent work.
What this project is
verso-mcp is a small, single-purpose MCP
server: it lets an AI agent search and read documentation built with
Verso, Lean's documentation tool. It
exposes exactly four read-only tools — list_sites, list_kinds, search,
fetch_page — over stdio.
It is deliberately small. Resist scope creep. New tools, new dependencies, new config surface, and "frameworks" are almost always the wrong call. A change that makes the server bigger needs a strong, specific justification.
Repository layout
| Path | Purpose |
|---|---|
src/verso_mcp/server.py |
The entire server. One file on purpose. |
src/verso_mcp/__init__.py, __main__.py |
Thin entry-point shims. |
tests/ |
pytest suite — offline (test_core.py, test_fetch.py) plus the live canary (test_xref_contract.py). |
pyproject.toml |
Packaging, dependencies, tool config (ruff, pytest, commitizen). |
server.json |
MCP registry manifest. |
evaluation.xml |
10-question eval suite (mcp-builder format). |
.github/workflows/ |
CI, CodeQL, release, Scorecard, Dependabot auto-merge, xref-drift canary. |
The version number lives in one place — __version__ in server.py — and
is surfaced everywhere else dynamically (hatchling) or by cz bump. Never edit a
version string by hand.
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 · 204 lines · 2,795 tokens per session scan A e7ba246283f2
verso-mcp AGENTS.md is an instructions file published in the GitHub repository nvlang/verso-mcp (1 stars, last pushed 6d ago), licensed Apache-2.0. It adds 2,795 tokens to every session, about $0.0112 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.
verso-mcp AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| verso-mcp AGENTS.mdnvlang/verso-mcp | Instructions file | 1 | 6d ago | Apache-2.0 | A | 2,795 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 275k | 3d ago | MIT | A | 4,313 | Codex, OpenCode |