What is nvim-mcp CLAUDE.md?

Project instructions for a Rust server that connects AI assistants to Neovim, a programmable text editor, through a standard tool interface.

They are for developing the server, connecting it to Neovim over a network address or socket, running HTTP mode, and executing targeted or complete tests.

They explain the project structure and the commands needed to build, run, test, and measure code coverage, including tests that require Neovim.

How linw1995/nvim-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to linw1995/nvim-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/linw1995/nvim-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/linw1995/nvim-mcp

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/linw1995/nvim-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/linw1995/nvim-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/linw1995/nvim-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/linw1995/nvim-mcp/claude-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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/linw1995/nvim-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/linw1995/nvim-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 787 This file is loaded in full into every session.

When invoked 787 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.

Model	Per session	Once invoked
Fable 5.1	$0.00787	$0.00787
Opus 5.5	$0.00315	$0.00315
Sonnet 5.5	$0.00157	$0.00157
Haiku 4.5	$0.00079	$0.00079

Measured 2mo ago against content hash 2684491c8d6a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

nvim-mcp CLAUDE.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.

CLAUDE.md · 108 lines

How it starts

The opening of the file, as written. The whole thing — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

This is a Rust-based MCP (Model Context Protocol) server that provides seamless integration with Neovim instances. The server acts as a bridge between AI assistants and Neovim editors, enabling operations like LSP integration, diagnostic analysis, and file manipulation through structured MCP tools and resources.

Development Commands

More details in @./docs/development.md .

Building and Running

# Development build and run
cargo build
cargo run -- --connect auto

# Connect to specific targets
cargo run -- --connect 127.0.0.1:6666
cargo run -- --connect /tmp/nvim.sock

# HTTP server mode with auto-connection
cargo run -- --http-port 8080 --connect auto

# Production build
cargo build --release

Testing

# Run all tests with output
./scripts/run-test.sh -- --show-output

# Run specific test modules
./scripts/run-test.sh -- --show-output neovim::integration_tests

# Skip integration tests (which require Neovim)
./scripts/run-test.sh -- --skip=integration_tests --show-output

# Run tests with coverage
./scripts/run-cov.sh -- --show-output

Linting and Formatting

pre-commit run --all-files

Architecture Overview

Core Components

MCP Server Core (src/server/core.rs): Main server implementation with connection management using DashMap for thread-safe concurrent access
Neovim Client (src/neovim/client.rs): Handles communication with Neovim instances via nvim-rs msgpack-rpc
Tool System (src/server/tools.rs): 26+ MCP tools for LSP operations, file navigation, and diagnostics
Resource System (src/server/resources.rs): Connection-scoped diagnostic resources with URI schemes
Transport Layer: Supports both stdio and HTTP server transports via rmcp

Testing Architecture

Integration Tests: Full MCP client-server communication tests in src/server/integration_tests.rs and src/neovim/integration_tests.rs
LSP Testing: Comprehensive Go/gopls integration with test data in src/testdata/
Global Test Mutex: Prevents port conflicts during concurrent execution
Automated Setup: Tests spawn and manage Neovim instances automatically
Code Coverage: LLVM-based coverage using grcov with HTML/Cobertura/Markdown reports

Read the full file on GitHub · 108 lines

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.

2mo ago First seen · 108 lines · 787 tokens per session scan A 2684491c8d6a

Subscribe to this mod's changes

nvim-mcp CLAUDE.md is an instructions file published in the GitHub repository linw1995/nvim-mcp (76 stars, last pushed 5d ago), licensed Apache-2.0. It adds 787 tokens to every session, about $0.0031 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.

lsp mcp-server nvim nvim-plugin

nvim-mcp CLAUDE.md next to 6 instructions from other repositories
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vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
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nvim-mcp: Instructions file for Claude Code