Basecamp MCP Server

An MCP server for Basecamp 3. It lets MCP-capable clients such as Codex, Cursor, and Claude Desktop read and manage Basecamp projects through OAuth-authenticated Basecamp API calls.

The main server is basecamp_fastmcp.py. It uses the official mcp.server.fastmcp Python SDK and exposes 79 tools covering projects, todos, message boards, campfires, card tables, inbox forwards, documents, uploads, comments, events, webhooks, and search.

What It Can Do

- Browse Basecamp projects and project details.
- Search across projects, todos, messages, campfire lines, comments, uploads, and schedules.
- Read and manage todolists, todos, todo groups, and completion state.
- Read and create message board messages, including drafts and categories.
- Read campfire lines.
- Read and create comments.
- Work with card tables, columns, cards, and card steps.
- Read inbox forwards and replies.
- Read daily check-ins and answers.
- Upload attachments and inspect uploads.
- Read and manage documents, including drafts.
- List events and manage webhooks.
- Generate local MCP configuration for Codex, Cursor, and Claude Desktop.

Requirements

- Python 3.10 or newer.
- A Basecamp 3 account.
- A Basecamp OAuth application from <https://launchpad.37signals.com/integrations>.
- A client that can run local MCP servers, such as Codex, Cursor, or Claude Desktop.

If your system Python is older, use uv; it can create a virtual environment with a newer Python version.

Quick Start

Clone the repository and install dependencies:

git clone https://github.com/georgeantonopoulos/Basecamp-MCP-Server.git
cd Basecamp-MCP-Server
uv venv --python 3.12 venv

source venv/bin/activate

uv pip install -r requirements.txt

Or, if python already points to Python 3.10 or newer:

python setup.py

Create a .env file from the example and fill in your Basecamp OAuth details:

cp .env.example .env

Required values:

BASECAMP_CLIENT_ID=your-client-id
BASECAMP_CLIENT_SECRET=your-client-secret
BASECAMP_ACCOUNT_ID=your-account-id
USER_AGENT="Your App Name (your@email.com)"

Authenticate with Basecamp:

python oauth_app.py

Open <http://localhost:8000> and complete the OAuth flow. The token is stored locally in oauth_tokens.json by default.

Configure Your MCP Client

Codex

python generate_codex_config.py
codex mcp get basecamp

Useful options:

python generate_codex_config.py --dry-run
python generate_codex_config.py --legacy

The script writes a basecamp server entry to ~/.codex/config.toml and points it at this checkout's virtual environment and basecamp_fastmcp.py.

Cursor

python generate_cursor_config.py

Then restart Cursor and check Settings -> MCP. The server should appear as basecamp.

Claude Desktop

python generate_claude_desktop_config.py

Then fully quit and reopen Claude Desktop. The generated config is written to:

- macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
- Windows: ~/AppData/Roaming/Claude/claude_desktop_config.json
- Linux: ~/.config/claude-desktop/claude_desktop_config.json

Verify The Server

Run the FastMCP server through stdio and ask for its tool list:

printf '%s\n%s\n%s\n' \
  '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"test","version":"1.0"}}}' \
  '{"jsonrpc":"2.0","method":"notifications/initialized","params":{}}' \
  '{"jsonrpc":"2.0","id":2,"method":"tools/list","params":{}}' \
  | python basecamp_fastmcp.py

Run the automated tests:

python -m pytest tests/ -v

Available Tools

The FastMCP server exposes 79 tools.

Projects And Search

- get_projects
- get_project
- search_basecamp
- global_search

Todos

- get_todolists
- get_todolist
- create_todolist
- update_todolist
- trash_todolist
- get_todos
- get_todo
- create_todo
- update_todo
- delete_todo
- archive_todo
- complete_todo
- uncomplete_todo
- reposition_todo
- get_todolist_groups
- create_todolist_group
- reposition_todolist_group

Messages, Campfires, And Check-Ins

- get_message_board
- get_messages
- get_message
- get_message_categories
- create_message
- create_draft_message

Pass publish: false to create_message to create a draft message instead
of posting it immediately. Agents can also call create_draft_message directly
when the intended operation is specifically to create a draft.

- get_campfire_lines
- get_daily_check_ins
- get_question_answers

Comments

- get_comments
- create_comment

Card Tables

- get_card_tables
- get_card_table
- get_columns
- get_column
- create_column
- update_column
- move_column
- update_column_color
- put_column_on_hold
- remove_column_hold
- watch_column
- unwatch_column
- get_cards
- get_card
- create_card
- update_card
- move_card
- complete_card
- uncomplete_card
- get_card_steps
- create_card_step
- get_card_step
- update_card_step
- delete_card_step
- complete_card_step
- uncomplete_card_step

Inbox Forwards

- get_inbox
- get_forwards
- get_forward
- get_inbox_replies
- get_inbox_reply
- trash_forward

Documents, Uploads, Attachments, Events, And Webhooks

- create_attachment
- get_uploads
- get_upload
- download_upload — download a vault Upload recording (Docs & Files) and
return its bytes as MCP content (`ImageContent for image MIME types,
EmbeddedResource / BlobResourceContents otherwise). The MCP host
forwards the blob to the model, so PDFs, images, and documents are read
natively without an out-of-band fetch.
- download_attachment — download an inline comment/message attachment by its
content_attachments[].download_url and return it as MCP content. Use this
for files embedded into a comment or message body. Inline attachments are
Attachment objects with their own IDs and cannot be resolved through
/uploads/{id} — that endpoint returns 404. For files that are their own
Upload recording in a vault, use download_upload instead.

> Host compatibility for download_upload and download_attachment.
> Both tools return MCP content blocks. The file is only readable by the
> model if the MCP host forwards ImageContent / EmbeddedResource
> (BlobResourceContents) on. Status as of June 2026:
>
> - Claude Code (CLI) — fully supported, including application/pdf
> and other binary blob resources.
> - Claude Desktop / claude.ai web — image content blocks work, but
> non-image EmbeddedResource blocks are rejected with "Resources of
> type 'application/pdf' are not currently supported". The bytes reach
> the host but never the model. Once the client adds support, these
> tools become useful in those frontends without server changes.
- get_documents
- get_document
- create_document
- create_draft_document

Pass publish: false to create_document to create a draft document instead
of publishing it immediately. Agents can also call create_draft_document
directly when the intended operation is specifically to create a draft.

- update_document
- trash_document
- get_events
- get_webhooks
- create_webhook
- delete_webhook

- basecamp_fastmcp.py: FastMCP stdio server used by MCP clients.
- basecamp_client.py: Synchronous Basecamp 3 API client.
- search_utils.py: Higher-level search helpers across Basecamp resources.
- oauth_app.py: Local Flask OAuth flow for Basecamp authentication.
- auth_manager.py: OAuth refresh helper used before API calls.
- token_storage.py: Local OAuth token storage.
- generate_codex_config.py: Codex MCP configuration generator.
- generate_cursor_config.py: Cursor MCP configuration generator.
- generate_claude_desktop_config.py: Claude Desktop configuration generator.
- mcp_server_cli.py: Legacy JSON-RPC server kept for compatibility and tests.

1. Create a Basecamp OAuth app.
2. Put the client ID, client secret, account ID, redirect URI, and user agent in .env.
3. Run python oauth_app.py.
4. Complete the browser flow at <http://localhost:8000>.

By default, OAuth tokens are stored in <project>/oauth_tokens.json. For containers, read-only checkouts, or mounted token volumes, set BASECAMP_MCP_TOKEN_FILE:

export BASECAMP_MCP_TOKEN_FILE=/var/lib/basecamp-mcp/oauth_tokens.json

Both the OAuth app and the MCP server read the same variable. token_storage.py expands ~ and environment variables in this path, creates the parent directory if needed, and attempts to set the token file permissions to 0o600 when writing. Parent directory permissions are still your responsibility.

   ./venv/bin/python -c "import mcp; print('MCP available')"
   

2. Confirm .env contains BASECAMP_ACCOUNT_ID.
3. Re-run the relevant config generator.
4. Fully quit and restart your MCP client.

python oauth_app.py

~/Library/Logs/Claude/

- Do not commit .env or oauth_tokens.json.
- Use a descriptive USER_AGENT that includes contact information, as Basecamp expects API clients to identify themselves.
- Keep token files on local or appropriately permissioned storage.
- This server is designed for local MCP client use. Review the code and deployment model before exposing it on a network.

MIT. See LICENSE`.

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