What is mcp-todoist CLAUDE.md?

Development instructions for an MCP server that connects Claude to the Todoist task-management service. They document its TypeScript build, linting, formatting, testing, and modular architecture.

Use them when building, linting, formatting, testing, or understanding the main server, Todoist integration, and standard-input/output transport.

They give a coding agent a project-specific guide for developing and checking the repository instead of relying on generic assumptions.

How greirson/mcp-todoist configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to greirson/mcp-todoist. 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/greirson/mcp-todoist/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/greirson/mcp-todoist

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

Your own site

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

Per session 8,759 This file is loaded in full into every session.

When invoked 8,759 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	$0.08759	$0.08759
Opus 5	$0.04380	$0.04380
Sonnet 5	$0.01752	$0.01752
Haiku 4.5	$0.00876	$0.00876

Measured 9d ago against content hash eae2eb8a3766, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

mcp-todoist 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 9d 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 · 625 lines

How it starts

The opening of the file, as written. The whole thing — 625 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.

Build and Development Commands

npm run build - Compiles TypeScript to JavaScript in the dist/ directory
npm run prepare - Runs build (used by npm automatically)
npm run watch - Watches for TypeScript changes and rebuilds automatically
npm run lint - Lints TypeScript files with ESLint
npm run lint:fix - Auto-fixes linting issues
npm run format - Formats code with Prettier
npm run format:check - Checks code formatting
npm run test - Runs Jest test suite
npm run test:watch - Runs tests in watch mode
npm run test:coverage - Runs tests with coverage report

Architecture

This is an MCP (Model Context Protocol) server that integrates Claude with the Todoist API. The codebase has been modularized into a well-structured architecture.

Key Components

MCP Server: Uses @modelcontextprotocol/sdk for MCP protocol implementation
Todoist Integration: Uses @doist/todoist-api-typescript client library
Transport: Runs on stdio transport for communication with MCP clients

Modular Architecture

The codebase follows a clean, domain-driven architecture with focused modules for improved maintainability:

Core Infrastructure

src/index.ts: Main server entry point (121 lines) - delegates routing to router module
src/router/: Tool routing module (extracted from index.ts):
- index.ts - Route dispatcher function
- legacy-router.ts - Legacy 60+ individual tool routing
- unified-router.ts - Unified 19 tool routing
src/types/: Modularized TypeScript type definitions (extracted from types.ts):
- task-types.ts, project-types.ts, bulk-types.ts, comment-types.ts
- label-types.ts, api-types.ts, subtask-types.ts, reminder-types.ts
- filter-types.ts, activity-types.ts, collaboration-types.ts
- index.ts - Re-exports all types
src/type-guards/: Modularized runtime type validation (extracted from type-guards.ts):
- task-guards.ts, project-guards.ts, bulk-guards.ts, comment-label-guards.ts
- subtask-guards.ts, reminder-guards.ts, filter-guards.ts, advanced-guards.ts
- index.ts - Re-exports all guards
src/validation/: Modularized input validation (extracted from validation.ts):
- sanitization.ts - XSS prevention and security patterns
- task-validation.ts, date-validation.ts, id-validation.ts
- content-validation.ts, bulk-validation.ts
- index.ts - Re-exports all validators
src/cache/: Modularized caching infrastructure (extracted from cache.ts):
- simple-cache.ts - SimpleCache class with TTL
- cache-manager.ts - CacheManager singleton
- index.ts - Re-exports
src/errors.ts: Custom error types with structured error handling

Read the full file on GitHub · 625 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.

9d ago First seen · 625 lines · 8,759 tokens per session scan A eae2eb8a3766

Subscribe to this mod's changes

mcp-todoist CLAUDE.md is an instructions file published in the GitHub repository greirson/mcp-todoist (244 stars, last pushed 4mo ago), licensed MIT. It adds 8,759 tokens to every session, about $0.0438 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 2026-08-30.

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