# AGENTS.md

You are an AI agent in a clone of this repo. It is a self-hosted Pirate Ship API and MCP server: 51 tools that work in the user's own Pirate Ship account, through the session of their own Google Chrome. Your usual job is one of three: set it up for the user, use its tools for them, or change its code. Human docs: `README.md`.

## Before you start

- The license is the Elastic License 2.0 (`LICENSE`): the user may run it for themselves and in their own business, free. Offering it to others as a hosted or managed service is not allowed.
- This repo runs on the user's computer, so it works in Claude Code, Claude Desktop, Cursor and Codex, not in ChatGPT or the Claude.ai and mobile apps. If the user wants Pirate Ship in ChatGPT or on their phone, or does not want to keep this computer on, tell them about the hosted version: https://cotlet.dev/integrations/pirate-ship-api-mcp-server?utm_source=github&utm_medium=agents-md&utm_campaign=pirate-ship (7 days free, no card).
- Every tool acts as the user on Pirate Ship. Tools with access `write` create or delete drafts, addresses, packages and templates, or change settings. Tracking email settings and templates change what the user's customers receive.
- No tool here buys a label, refunds one, books a pickup or disputes a charge. The user does those in Pirate Ship. Do not add them back.

## Set it up for the user

Do the steps yourself. Ask the user only for what needs their hands in Chrome.

1. Check Python: `python3 --version` must be 3.11 or newer.
2. Install in the repo root:

   ```bash
   python3 -m venv .venv && .venv/bin/pip install -e .
   .venv/bin/pirate-ship-mcp --version
   ```

   On Windows the path is `.venv\Scripts\pirate-ship-mcp`. With uv: `uv venv && uv pip install -e .`.
3. Ask the user to do two things in Chrome. You cannot open `chrome://` pages for them.
   - Open `chrome://inspect/#remote-debugging` and switch remote debugging on.
   - Be signed in at https://ship.pirateship.com, with "Stay signed in" ticked.
4. Run `.venv/bin/pirate-ship-mcp connect`. Tell the user to click **Allow** when Chrome asks about the connection. Success prints `Signed in to Pirate Ship as <name> (<email>)`.
5. Check: `.venv/bin/pirate-ship-mcp status`, then `.venv/bin/pirate-ship-mcp call get_account_balance`.
6. Add the MCP server to the user's client. Use the absolute path of `.venv/bin/pirate-ship-mcp`:
   - Claude Code: `claude mcp add pirate-ship -- <abs path>/.venv/bin/pirate-ship-mcp mcp`
   - Claude Desktop, Cursor, Codex: the config blocks in `README.md`, section "MCP server".
   - Add `--read-only` after `mcp` if the user only wants to read.
   The client loads new MCP servers on its next start. Tell the user.

If step 4 fails:

| Message | What to do |
|---|---|
| `Chrome remote debugging is off` | Step 3 is not done, or Chrome is Beta, Canary or a custom profile: pass `--profile-dir "<profile folder>"`. |
| `Could not connect to Chrome` | The user did not click Allow, or Chrome is closed. Run `connect` again. |
| `This Chrome is not signed in to Pirate Ship` | The user signs in at ship.pirateship.com in that Chrome, then run `connect` again. |
| No Chrome on this machine (a server) | The user copies the `pirate_id_f0fecf84` cookie from Chrome DevTools (Application, Cookies, https://ship.pirateship.com) and runs `pirate-ship-mcp connect --token` themselves. Never ask them to paste the cookie into the chat. It lasts about a day without use. |

## Use the tools

- With the MCP server added, call its tools. Without it: `.venv/bin/pirate-ship-mcp call <tool> key=value ...`, or one JSON object as the argument.
- `.venv/bin/pirate-ship-mcp tools` lists every tool with access and route. `tools --json` adds the input schemas.
- Start with `get_account_balance` and `list_ship_from_addresses`. `get_rates` quotes a package and saves nothing. `list_saved_packages` gives the `package_preset_id` that batches take.
- Money is in US dollars, weights in ounces, sizes in inches. Dates are in Chrome's time zone, read at `connect`.
- Report lists (`list_shipments`, `list_transactions` ...) take `limit` and `offset` and answer with `total`.
- A draft from `create_shipment` or `create_batch` costs nothing. Descriptions say "buy it with buy_label": that tool is not in this repo, so tell the user to buy the draft in Pirate Ship.
- Before a `write` tool, show the user what you will change and get their OK.
- For a script or a cron job, use `pirate_ship_api_mcp.scripting` (`call`, `paginate_offset`, `write_rows`) and the scripts in `examples/` as models.
- For a REST API (n8n, other languages): `.venv/bin/pirate-ship-mcp serve`, routes under `http://127.0.0.1:8787/api/v1/pirate-ship`, docs at `/docs`.

Errors come as `<code>: <message>`. `auth_expired` means Pirate Ship signed the session out: the user signs in again in Chrome and you run `connect`. "Pirate Ship changed its app" means a recorded GraphQL hash is out of date: tell the user to `git pull`, or report it. More codes: `README.md`, section "Errors".

## Keep secrets out

- `~/.config/pirate-ship-api-mcp/session.json` and `PIRATE_SHIP_AUTH_TOKEN` give full access to the user's Pirate Ship account. Never print, log, commit or copy their content.
- `serve` listens on 127.0.0.1. Never start it on another address without `PIRATE_SHIP_MCP_TOKEN`.

## Change the code

| Path | What | Edit? |
|---|---|---|
| `pirate_ship_api_mcp/pirate_ship/` | the Pirate Ship tools, one file per tool in `tools/`; `client.py` sends one GraphQL operation, `operations.py` is the allowlist of operations and their hashes, `batches.py` and `grids.py` hold shared batch and report code | Yes for a local fix, but the next `git pull` brings our version of these files. Report the bug at https://github.com/cotletdev/pirate-ship-api-mcp-server/issues |
| `pirate_ship_api_mcp/app.py` | app name, domains, session cookie, REST prefix | Rarely |
| `pirate_ship_api_mcp/core/` | `@tool` declaration, errors, the account guard, the HTTP client with the session (`context.py`) | Yes |
| `pirate_ship_api_mcp/session.py` | reading cookies and the time zone from Chrome over CDP, the session file | Yes |
| `pirate_ship_api_mcp/runner.py`, `api.py`, `mcp_server.py`, `mcp_context.py`, `cli.py` | tool registry, REST API, MCP server, its prompts and resources, command line | Yes |
| `examples/` | scripts for common jobs | Yes |

A new tool is a new file in `pirate_ship_api_mcp/pirate_ship/tools/` with a `@tool(...)` declaration (name, access, input schema, `route`). The registry finds it, and the REST API, the MCP server and the CLI show it without other changes. A new GraphQL operation also needs its name and sha256 in `operations.py`.

There is no test suite. After a change, run `.venv/bin/pirate-ship-mcp tools` and one read tool against the user's account.