Repo Docs MCP (Bun)

Generic MCP stdio server that exposes a local repository checkout (docs + code) to any MCP host.

Designed for the “one codebase, many instances” workflow:

you run the same server binary multiple times,
each instance points at a different repo via env,
each instance gets its own tool prefix + URI scheme.

What it provides

Tools (names are prefixed)

Given MCP_TOOL_PREFIX=telegraph, tools are:

telegraph_read_repo_file — read any text file from the repo checkout
telegraph_list_docs — list doc pages as slug -> docs/... (slug is inferred from the docs file path)
telegraph_get_doc — read a doc page by slug
telegraph_search_docs — search inside the docs directory
telegraph_search_code — search inside common code directories
telegraph_refresh_index — rebuild the docs index
telegraph_git_fetch — git fetch --prune --tags for the repo (optional helper)
telegraph_info — print server settings (paths, prefixes, etc.)

Resources (names are prefixed by URI scheme)

Given MCP_URI_SCHEME=telegraph, resources are:

telegraph://readme
telegraph://contributing
telegraph://doc/{slug}

Prompts

{prefix}_doc_writer — starter workflow for “write a guide / answer about this repo”.

Install

bun install
bun run build

Run (stdio)

MCP_REPO_ROOT=/ABS/PATH/to/repo \
MCP_TOOL_PREFIX=myrepo \
MCP_URI_SCHEME=myrepo \
bun run start

In stdio mode, logs go to stderr on purpose (stdout is reserved for MCP JSON-RPC).

Environment variables

Required:

MCP_REPO_ROOT — absolute path to the local repo checkout

Optional:

MCP_TOOL_PREFIX — tool name prefix (default: repo)
MCP_URI_SCHEME — resource URI scheme (default: derived from tool prefix)
MCP_REPO_LABEL — text label used in the prompt (default: basename of repo root)
MCP_DOCS_DIR — docs directory relative to repo root (default: docs)
MCP_DOCS_EXTS — comma-separated docs extensions (default: .md,.mdx)
MCP_CODE_DIRS — comma-separated dirs to search for code (default: src,config,routes,database,resources,tests)
MCP_CODE_EXTS — comma-separated extensions for code search (default: .php,.md,.json,.yml,.yaml,.xml,.ts,.js)

Limits:

MCP_MAX_FILE_BYTES (default: 512KB)
MCP_DEFAULT_MAX_CHARS (default: 50k chars)

Git helper:

MCP_GIT_AUTO_FETCH=1 — run git fetch --prune --tags once at server start (default: off)
MCP_GIT_FETCH_TIMEOUT_MS — timeout for the fetch command (default: 30000)

Compatibility:

If MCP_REPO_ROOT is not set, the server will fall back to MCP_TELEGRAPH_ROOT (legacy name).

Codex config (two instances; one codebase)

Add this to ~/.codex/config.toml:

[mcp_servers.telegraph_docs]
command = "/ABS/PATH/TO/bun"
cwd = "/ABS/PATH/TO/mcp"
args = ["run", "build/index.js"]

[mcp_servers.telegraph_docs.env]
MCP_REPO_ROOT = "/ABS/PATH/TO/telegraph"
MCP_TOOL_PREFIX = "telegraph"
MCP_URI_SCHEME = "telegraph"
MCP_REPO_LABEL = "defstudio/telegraph"


[mcp_servers.laravel_data_docs]
command = "/ABS/PATH/TO/bun"
cwd = "/ABS/PATH/TO/mcp"
args = ["run", "build/index.js"]

[mcp_servers.laravel_data_docs.env]
MCP_REPO_ROOT = "/ABS/PATH/TO/laravel-data"
MCP_TOOL_PREFIX = "laravel_data"
MCP_URI_SCHEME = "laravel-data"
MCP_REPO_LABEL = "spatie/laravel-data"

Claude Desktop config (two instances)

See claude_desktop_config.example.json.

Notes

Docs slugs are inferred from file paths (ordering prefixes like 01., 01-, 01_ are stripped).
If a doc file is index.md inside a folder, the slug is the folder name (e.g. guide/index.md → guide).

Repo Docs MCP