What is backlog_mcp CLAUDE.md?

A Claude Code instruction file for the Backlog MCP project, covering its design, coding rules, file layout, and tests.

Use it when developing the TypeScript server that provides read access to Backlog through MCP.

It gives agents the project-specific rules needed to change the code without breaking its architecture.

How cuongph-dev-work/backlog_mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to cuongph-dev-work/backlog_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/cuongph-dev-work/backlog_mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/cuongph-dev-work/backlog_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/cuongph-dev-work/backlog_mcp/claude-md/github.svg)](https://agentmods.dev/instructions/cuongph-dev-work/backlog_mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/cuongph-dev-work/backlog_mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/cuongph-dev-work/backlog_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/cuongph-dev-work/backlog_mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/cuongph-dev-work/backlog_mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 3,037 This file is loaded in full into every session.

When invoked 3,037 The same file — it is already loaded in full.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin 72% copy Near-identical to another mod 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	$0.03037	$0.03037
Opus 5.5	$0.01215	$0.01215
Sonnet 5.5	$0.00607	$0.00607
Haiku 4.5	$0.00304	$0.00304

Measured 2mo ago against content hash 1b72c41dba19, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

backlog_mcp CLAUDE.md scanned grade A 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

3. **HTTP via `BacklogHttpClient`.** All Backlog REST API calls go through `src/backlog/http-client.ts` (Axios). API Key auto-appended via `axios.create({ params: { apiKey } })`.

Origin

This is a copy

72% identical to claude-code-trace AGENTS.md — 238 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CLAUDE.md · 231 lines

How it starts

The opening of the file, as written. The whole thing — 231 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md — Instructions for Claude Code

Read this file in full before working on this project. This is the canonical instruction set for Claude when working on backlog-mcp.

Project Overview

backlog-mcp is a TypeScript MCP (Model Context Protocol) server providing AI agents with read access to a Backlog (Nulab) space. Authentication uses a static API Key in .env — no browser or OAuth required.

Stack: TypeScript (strict, ESM/NodeNext), Express, @modelcontextprotocol/sdk, Axios, Zod, Vitest.

Architecture Rules

Factory pattern per request. Each MCP request creates a new McpServer + StreamableHTTPServerTransport. Never reuse across requests.
Auth is a config concern. BacklogHttpClient receives apiKey from config at construction. Tool handlers never handle auth directly.
HTTP via BacklogHttpClient. All Backlog REST API calls go through src/backlog/http-client.ts (Axios). API Key auto-appended via axios.create({ params: { apiKey } }).
Zod validates everything. Env vars (src/config.ts) and tool inputs (schema in each tool file) are Zod-validated before use.
Two-layer type system.
- src/types/backlog-api.ts — raw Backlog REST response shapes (used only in http-client.ts and mappers.ts)
- src/types.ts — normalized domain interfaces (used everywhere else)
- src/backlog/mappers.ts — bridges raw → domain

Coding Standards

No any. TypeScript strict mode. All types must be explicit.
ESM .js extensions. Every import: import "./foo.js" not "./foo".
McpError for all errors. Use factory helpers from src/errors.ts. Never throw new Error(...) for business logic.
isError: true on error responses. MCP clients depend on this flag — never return errors as normal content.
401/403 = invalid API key. assertOk() in the HTTP client handles this; tool handlers just catch (McpError).
Shared helpers → src/utils.ts. Date formatting, string manipulation, etc. go there — not inline in handlers.
Prefer npm packages over hand-rolled code. Use established libraries for common tasks.
Raw types stay in backlog-api.ts. Never leak raw Backlog API shapes into tool handlers.

Read the full file on GitHub · 231 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 · 231 lines · 3,037 tokens per session scan A 1b72c41dba19

Subscribe to this mod's changes

backlog_mcp CLAUDE.md is an instructions file published in the GitHub repository cuongph-dev-work/backlog_mcp (0 stars, last pushed 6mo ago), licensed MIT. It adds 3,037 tokens to every session, about $0.0121 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). It is 72% identical to claude-code-trace AGENTS.md, differing in 238 lines, and is treated as a copy.

backlog_mcp CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
backlog_mcp CLAUDE.mdcuongph-dev-work/backlog_mcp	Instructions file	0	6mo ago	MIT	A	3,037	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

backlog_mcp: Instructions file for Claude Code