bm25-code-search

bm25-code-search is an MCP server for Claude Code, Codex, Cursor, Gemini CLI, OpenCode from toaruR/mcp-server-bm25-code-search. Its token cost is not measured, scanned A, original, MIT.

A local MCP server for BM25 code search, started with Python. BM25 is a search method that ranks results by how closely they match the words in a query.

In plain words
What is it for?
Searching a codebase through the bm25_search MCP server.
Why use it?
It helps an agent find relevant code without searching every file manually, but it requires the PYTHONUTF8 environment setting.

MCP server for Claude CodeCodexCursorGemini CLIOpenCode

Written for no agent in particular: it speaks MCP, so any client can run it. Also seen: listed in a Claude config.

One of 2 entries in .mcp.json upstream. Installing this one merges just its entry into your config; the other 1 are separate, each on its own page.

Good fit Searching a codebase through the bm25_search MCP server.

Compare 6 mcp servers from other repositories ↓
Install with agentmods
npx agentmods add mcp/toarur/mcp-server-bm25-code-search/bm25-code-search

Installing this writes the configuration, not the program: `python` runs a file from the repository, so clone it first and make the path in the command match where you put it.

Install

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.

Clone the repo
git clone --depth 1 https://github.com/toaruR/mcp-server-bm25-code-search

Installing this writes the configuration, not the program: `python` runs a file from the repository, so clone it first and make the path in the command match where you put it.

Made for: Claude Code, Codex, Cursor, Gemini CLI, 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.

agentmods badge for bm25-code-search

README.md
[![agentmods](https://agentmods.dev/badge/mcp/toarur/mcp-server-bm25-code-search/bm25-code-search/github.svg)](https://agentmods.dev/mcp/toarur/mcp-server-bm25-code-search/bm25-code-search)
Your own site
<a href="https://agentmods.dev/mcp/toarur/mcp-server-bm25-code-search/bm25-code-search"><img src="https://agentmods.dev/badge/mcp/toarur/mcp-server-bm25-code-search/bm25-code-search/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.

agentmods 80×15 button for bm25-code-search

Your own site · 80×15
<a href="https://agentmods.dev/mcp/toarur/mcp-server-bm25-code-search/bm25-code-search"><img src="https://agentmods.dev/badge/mcp/toarur/mcp-server-bm25-code-search/bm25-code-search.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
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.
Security

Grade A, and why

bm25-code-search 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.

.mcp.json · 19 lines

What it actually says

{
  "bm25-code-search": {
    "type": "stdio",
    "command": "python",
    "args": [
      "D:/vagrant/harnesses/mcp-server-bm25-code-search/bm25_search/mcp_server.py",
      "--stdio",
      "--db",
      "D:/vagrant/harnesses/mcp-server-bm25-code-search/.bm25_index.db",
      "--sessions",
      "--client-agent",
      "claude_code"
    ],
    "env": {
      "PYTHONUTF8": "1",
      "PYTHONPATH": "D:/vagrant/harnesses/mcp-server-bm25-code-search"
    }
  }
}
Same file

What else .mcp.json configures

This page is one entry in a file that holds 2. Installing the file brings all of them; each is measured and scanned on its own page.

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. 3d ago Changed · +6 lines 4315021058f2
  2. 1mo ago First seen · 13 lines scan A 8ebedd973fa2

Subscribe to this mod's changes

bm25-code-search is an MCP server published in the GitHub repository toaruR/mcp-server-bm25-code-search (0 stars, last pushed 3d ago), licensed MIT. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. 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.