What is twilio-mcp CLAUDE.md?

A set of project instructions for Claude Code, an AI coding assistant, in a Twilio SMS server project. It describes the project, its commands, and its two-server design.

Guiding development of the Twilio MCP server, including TypeScript builds, tests, linting, local development, and webhook handling.

It gives the coding assistant the project context needed to install, build, test, and work on the code consistently.

How griffinwork40/twilio-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to griffinwork40/twilio-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/griffinwork40/twilio-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/griffinwork40/twilio-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/griffinwork40/twilio-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/griffinwork40/twilio-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/griffinwork40/twilio-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/griffinwork40/twilio-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/griffinwork40/twilio-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/griffinwork40/twilio-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,770 This file is loaded in full into every session.

When invoked 1,770 The same file — it is already loaded in full.

Security scan C 1 finding. 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	$0.01770	$0.01770
Opus 5.5	$0.00708	$0.00708
Sonnet 5.5	$0.00354	$0.00354
Haiku 4.5	$0.00177	$0.00177

Measured 2mo ago against content hash 16f59c0710bc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

twilio-mcp CLAUDE.md scanned grade C with 1 finding 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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

2. Delete existing database: `rm -rf data/twilio.db`

CLAUDE.md · 213 lines

How it starts

The opening of the file, as written. The whole thing — 213 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

Twilio MCP Server - A Model Context Protocol (MCP) server that enables AI-powered SMS messaging with intelligent conversation management through Twilio's API. Provides tools for sending SMS, receiving webhooks, and managing conversation threads with SQLite persistence.

Build & Development Commands

# Install dependencies
npm install

# Build TypeScript to dist/
npm run build

# Development mode with auto-reload
npm run dev

# Type checking (no emit)
npm run lint

# Run tests
npm test
npm run test:watch
npm run test:coverage

Architecture Overview

Dual Server Design

This project runs TWO separate servers simultaneously:

MCP Server (stdio transport) - Communicates with Claude Code via stdio, exposes tools
Express Webhook Server (HTTP) - Receives inbound SMS and status callbacks from Twilio

Entry Points

src/index.ts - Starts MCP server on stdio (used by Claude Code)
src/webhook-server.ts - Can be run standalone for webhook testing
When running via npm run dev, only the MCP server starts. The webhook server must be started separately or within the MCP server startup logic.

Core Components

MCP Layer (src/server.ts)

Registers 5 MCP tools: send_sms, get_inbound_messages, create_conversation, get_conversation_thread, get_message_status
All tool handlers return JSON responses via MCP's content protocol
Uses @modelcontextprotocol/sdk for stdio transport

Webhook Layer (src/webhook-server.ts)

Express server on configurable port (default 3000)
Two endpoints: /webhooks/twilio/sms (inbound messages), /webhooks/twilio/status (delivery updates)
Validates all webhooks using Twilio signature verification
Auto-creates conversations when AUTO_CREATE_CONVERSATIONS=true

Storage Layer (src/storage/)

conversation-store.ts - SQLite persistence for conversation threads
message-store.ts - SQLite persistence for SMS/MMS messages
Both use better-sqlite3 with synchronous API
Participant matching uses normalized key ([+1111, +2222] → +1111|+2222)

Read the full file on GitHub · 213 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 · 213 lines · 1,770 tokens per session scan C 16f59c0710bc

Subscribe to this mod's changes

twilio-mcp CLAUDE.md is an instructions file published in the GitHub repository griffinwork40/twilio-mcp (1 stars, last pushed 10mo ago), licensed MIT. It adds 1,770 tokens to every session, about $0.0071 per session on Opus 5.5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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