What is mcp-signal CLAUDE.md?

A project instruction file for mcp-signal, a local tool that reads and searches Signal Desktop data and sends Signal messages.

Use it when developing or maintaining the mcp-signal server, including its tests, commands, and message features.

It gives the agent the project’s structure, commands, language rules, and limits so changes follow the repository’s expectations.

How Sealjay/mcp-signal configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Sealjay/mcp-signal. 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/Sealjay/mcp-signal/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/Sealjay/mcp-signal

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/sealjay/mcp-signal/claude-md/github.svg)](https://agentmods.dev/instructions/sealjay/mcp-signal/claude-md)

Your own site

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

Per session 233 This file is loaded in full into every session.

When invoked 233 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	$0.00233	$0.00233
Opus 5.5	$0.00093	$0.00093
Sonnet 5.5	$0.00047	$0.00047
Haiku 4.5	$0.00023	$0.00023

Measured 20d ago against content hash b124dae853f0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcp-signal 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 20d 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 · 34 lines

What it actually says

mcp-signal

Minimal Signal MCP server: read and search Signal Desktop data locally via signal-export, then send outbound messages via signal-cli JSON-RPC. stdio by default; serve --http is stateless streamable HTTP (MCP 2026-07-28 and older).

Commands

uv sync
uv run signal-mcp smoke
uv run pytest
uv run ruff check .

Structure

src/mcp_signal/
  config.py       Environment parsing and defaults
  reader.py       Signal Desktop read/search via sigexport
  signal_cli.py   signal-cli JSON-RPC wrapper for send + group resolution
  link_manager.py signal-cli device-linking + QR URI capture
  server.py       FastMCP tool registration
  main.py         CLI entry point (serve / smoke), HTTP auth + /health
tests/

Constraints

British English for prose, American English in code.
Pin Python dependencies exactly.
Keep the tool surface small: read/search/send plus the setup helpers.
Prefer clear tool errors over silent fallbacks.

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.

20d ago Changed · +37 tokens per session b124dae853f0
2mo ago First seen · 34 lines · 196 tokens per session scan A c48719b1ac12

Subscribe to this mod's changes

mcp-signal CLAUDE.md is an instructions file published in the GitHub repository Sealjay/mcp-signal (0 stars, last pushed 2d ago), licensed MIT. It adds 233 tokens to every session, about $0.0009 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.

mcp-signal CLAUDE.md next to 6 instructions from other repositories
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mcp-signal: Instructions file for Claude Code