What is bullet-mcp CLAUDE.md?

Repository instructions for an AI coding agent working on an MCP server that wraps Bullet, a task, note, event, collection, and tag manager.

Generating API types from the OpenAPI specification, running tests, checking types, linting, and maintaining the Bullet integration.

They explain the project commands and its spec-first, TDD workflow. TDD means writing tests to define behavior before or alongside the implementation.

How davebream/bullet-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to davebream/bullet-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/davebream/bullet-mcp/main/CLAUDE.md

Clone the repo

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

Your own site

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

Per session 944 This file is loaded in full into every session.

When invoked 944 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	$0.00944	$0.00944
Opus 5.5	$0.00378	$0.00378
Sonnet 5.5	$0.00189	$0.00189
Haiku 4.5	$0.00094	$0.00094

Measured 2mo ago against content hash 493a032c251b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

bullet-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 · 83 lines

How it starts

The opening of the file, as written. The whole thing — 83 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.

What This Is

An MCP (Model Context Protocol) server wrapping the Bullet API — a task/note/event manager with collections and tags. The MCP server version is kept 1:1 with the API version defined in spec/openapi.json.

Commands

bun install              # Install dependencies
bun run build            # Compile TypeScript → dist/
bun run test             # Run all tests (vitest)
bun run test:watch       # Run tests in watch mode
bun run typecheck        # Type-check without emitting
bun run lint             # Biome lint + format check
bun run lint:fix         # Auto-fix lint/format issues
bun run generate         # Regenerate types from OpenAPI spec

Run a single test file: bunx vitest run tests/client/api.test.ts Run tests matching a name: bunx vitest run -t "listEntries"

Architecture

Spec-First, TDD Workflow

spec/openapi.json — single source of truth for the Bullet API contract
bun run generate → src/client/types.generated.ts (auto-generated, never hand-edit)
src/client/types.ts — ergonomic re-exports from the generated types
Tests are written before implementation; tests in tests/server/registration.test.ts verify that MCP tool definitions stay aligned with the OpenAPI spec (enums, required fields, parameter names)

Functional Core / Imperative Shell

Pure tool handlers (src/tools/entries.ts, collections.ts, tags.ts): (client, params) → string. No MCP awareness, no I/O beyond the injected client. Trivially testable with stub clients.
Formatting (src/tools/format.ts): Pure functions that render domain objects to text.
Zod schemas (src/tools/definitions.ts): Define MCP tool input schemas with Zod, mirroring the OpenAPI spec. Also exports TOOL_DEFINITIONS (JSON Schema form) used by registration tests.
Server shell (src/index.ts): Wires Zod schemas + handlers into McpServer.registerTool(). Reads BULLET_API_TOKEN from env. This is the only file with side effects.

Read the full file on GitHub · 83 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 · 83 lines · 944 tokens per session scan A 493a032c251b

Subscribe to this mod's changes

bullet-mcp CLAUDE.md is an instructions file published in the GitHub repository davebream/bullet-mcp (0 stars, last pushed 5mo ago), licensed MIT. It adds 944 tokens to every session, about $0.0038 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.

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bullet-mcp: Instructions file for Claude Code