What is mcp-devkit-server CLAUDE.md?

A project guide for a Node.js and TypeScript server that lets AI agents use Mapbox services for maps, locations, and geographic data.

Use it when adding or changing server tools, prompts, map-related workflows, configuration, tests, or Mapbox authentication.

It gives coding agents the project’s structure, design rules, tools, and required setup so they can make informed changes without first piecing everything together.

How mapbox/mcp-devkit-server configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to mapbox/mcp-devkit-server. 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/mapbox/mcp-devkit-server/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/mapbox/mcp-devkit-server

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/mapbox/mcp-devkit-server/claude-md/github.svg)](https://agentmods.dev/instructions/mapbox/mcp-devkit-server/claude-md)

Your own site

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

Per session 1,641 This file is loaded in full into every session.

When invoked 1,641 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	$0.01641	$0.01641
Opus 5.5	$0.00656	$0.00656
Sonnet 5.5	$0.00328	$0.00328
Haiku 4.5	$0.00164	$0.00164

Measured 10d ago against content hash c233ce1e7f98, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcp-devkit-server 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 10d 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 · 137 lines

How it starts

The opening of the file, as written. The whole thing — 137 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md — Mapbox MCP DevKit Server

Overview

This is an MCP (Model Context Protocol) server providing "geospatial intelligence capabilities through Mapbox APIs" for AI agents, enabling map styling, GeoJSON visualization, token management, and geocoding.

Tech Stack

Runtime: Node.js 22+ LTS
Language: TypeScript (strict mode)
Testing: Vitest
Package Manager: npm

Project Structure

The codebase organizes into:

src/index.ts - Main entry point with .env loading and server initialization
src/config/toolConfig.ts - Configuration parser for tool filtering and MCP-UI toggles
src/tools/ - MCP tool implementations with BaseTool abstract class and registry
src/prompts/ - MCP prompt implementations with BasePrompt abstract class and registry
src/resources/ - Static reference data (style specs, token scopes, Streets v8 fields)
src/utils/ - HTTP pipeline, JWT parsing, tracing, and version utilities
skills/ - Agent Skills providing domain expertise (cartography, security, style patterns)

Key Architectural Patterns

Tool Architecture: All tools extend BaseTool<InputSchema, OutputSchema> or MapboxApiBasedTool<InputSchema, OutputSchema>. Tools auto-validate inputs and outputs using Zod schemas. Each tool lives in src/tools/tool-name-tool/ with separate *.input.schema.ts, *.output.schema.ts, and *.ts files.

Prompt Architecture: All prompts extend BasePrompt abstract class. Prompts orchestrate multi-step workflows, guiding AI assistants through complex tasks with best practices built-in. Each prompt lives in src/prompts/ with separate files per prompt (e.g., CreateAndPreviewStylePrompt.ts). Prompts use kebab-case naming (e.g., create-and-preview-style).

HTTP Pipeline System: "Never patch global.fetch—use HttpPipeline with dependency injection instead." The HttpPipeline class applies policies (User-Agent, retry logic) via a chain-of-responsibility pattern. See src/utils/httpPipeline.ts:20.

Read the full file on GitHub · 137 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.

10d ago Changed · +9 tokens per session c233ce1e7f98
2mo ago First seen · 137 lines · 1,632 tokens per session scan A f542f9d7e28e

Subscribe to this mod's changes

mcp-devkit-server CLAUDE.md is an instructions file published in the GitHub repository mapbox/mcp-devkit-server (62 stars, last pushed yesterday), licensed MIT. It adds 1,641 tokens to every session, about $0.0066 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 2026-08-30.

Backend and APIs

mcp-devkit-server CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
mcp-devkit-server CLAUDE.mdmapbox/mcp-devkit-server	Instructions file	62	yesterday	MIT	A	1,641	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	today	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

mcp-devkit-server: Instructions file for Claude Code