Borrowing it
Nothing to install: this file belongs to toastynerd/emacs-mcp-server. 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/toastynerd/emacs-mcp-server/main/CLAUDE.mdgit clone --depth 1 https://github.com/toastynerd/emacs-mcp-serverWrote 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/toastynerd/emacs-mcp-server/claude-md)<a href="https://agentmods.dev/instructions/toastynerd/emacs-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/toastynerd/emacs-mcp-server/claude-md.svg" alt="Measured on agentmods" 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 | $0.00630 | $0.00630 |
| Opus 5 | $0.00315 | $0.00315 |
| Sonnet 5 | $0.00126 | $0.00126 |
| Haiku 4.5 | $0.00063 | $0.00063 |
Grade A, and why
emacs-mcp-server 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 8d 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 — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Scope
Direct MCP tools that allow Claude Code to communicate with and control a running Emacs instance.
Prerequisites
- Emacs with server mode enabled (
M-x server-start) - emacsclient available in PATH
- Node.js and npm (v14+)
MCP Tools
-
emacs-mcp-open - Opens the specified file in a new buffer in Emacs
- Required parameter:
file_path(absolute path to file) - Usage: For opening files directly in Emacs
- Required parameter:
-
emacs-mcp-magit - Opens Magit to show Git changes
- Optional parameter:
repo_path(defaults to current directory) - Usage: For viewing Git changes in the Magit interface
- Optional parameter:
-
emacs-mcp-check - Checks if the Emacs server is running
- No parameters
- Usage: For verifying Emacs server status
-
emacs-mcp-list - Lists all available tools in this MCP server
- No parameters
- Usage: For discovering available tools and their parameters
Complementary Tools
- git-mcp - For repository access and documentation exploration
- Usage: Allows Claude to read repository files and documentation
- Setup:
claude mcp add --transport sse git-mcp https://gitmcp.io/idosal/git-mcp
Setup
To configure these MCP tools with Claude Code:
# Install dependencies
npm install
# Add the direct tools to Claude Code
claude mcp add emacs-mcp-open /Users/toasty/programming/emacs-mcp-server/src/direct-tool.js
claude mcp add emacs-mcp-magit /Users/toasty/programming/emacs-mcp-server/src/direct-tool.js
claude mcp add emacs-mcp-check /Users/toasty/programming/emacs-mcp-server/src/direct-tool.js
claude mcp add emacs-mcp-list /Users/toasty/programming/emacs-mcp-server/src/direct-tool.js
Replace the paths with the absolute path to your repository.
Usage in Claude Code
/mcp emacs-mcp-open file_path="/path/to/your/file.txt"
/mcp emacs-mcp-magit repo_path="/path/to/your/repo"
/mcp emacs-mcp-check
/mcp emacs-mcp-list
Logs and Debugging
- Tool logs stored at:
/tmp/emacs-mcp-direct.log - Claude MCP status:
claude mcp list - Detailed MCP tool info:
claude mcp get emacs-mcp-open
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.
- 8d ago First seen · 65 lines · 630 tokens per session scan A 989040659c44
emacs-mcp-server CLAUDE.md is an instructions file published in the GitHub repository toastynerd/emacs-mcp-server (4 stars, last pushed 1y ago), licensed MIT. It adds 630 tokens to every session, about $0.0032 per session on Opus 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.
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