Negotiate

PyPI

Model Context Protocol (MCP) server for the negotiate.v1 protocol. Once installed in Claude Desktop, Cowork, Claude Code, or any other MCP-aware client, your Claude gains five native tools for negotiating with any negotiate.v1-compliant store.

What you get

Tool	Purpose
discover_store(domain)	Probe a domain to check if it's negotiable. Returns the protocol descriptor.
list_products(domain)	Enumerate negotiable products at the store.
start_negotiation(domain, product_id)	Open a chat session with the merchant agent.
send_message(next_url, message)	Send one shopper turn.
read_history(history_url)	Read the running history of a session.

The agent uses these like a human would use a browser: discover the store, pick a product, start a chat, send turns until the deal closes.

mcp-name: io.github.sanjana-pier39/negotiate-mcp

Install

The recommended path uses uv — no virtualenv plumbing, picks the right Python automatically.

# install uv if you don't have it (macOS):
brew install uv

# then point Claude Desktop / Cowork / Claude Code at it (see below).
# uvx will install the package the first time it's invoked.

If you'd rather use plain pip:

pip install negotiate-mcp

Wire it into Claude Desktop

1. Open your Claude Desktop config:

   • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
   • Windows: %APPDATA%\Claude\claude_desktop_config.json

2. Add this entry under mcpServers (creating the file if it doesn't exist):

   {
     "mcpServers": {
       "negotiate-agent": {
         "command": "uvx",
         "args": ["negotiate-mcp"]
       }
     }
   }
   

   See claude_desktop_config.example.json.

3. Quit and re-open Claude Desktop. The five tools should appear in any new conversation.

If you installed with plain pip instead of uv, replace the command/args block with:

"command": "negotiate-mcp",
"args": []

Wire it into Cowork or Claude Code

Same negotiate-mcp command. Add it to the corresponding MCP config in those clients (consult their docs for exact paths). The tool surface is identical.

Try it

Once installed, in a fresh chat:

Negotiate for a Dyson HP07 at negotiate.pier39.ai. Try to get it under $500. Bonus points for the engraved gift box.

Claude will call discover_store("negotiate.pier39.ai"), find the HP07 in the product list, call start_negotiation, then drive the conversation through send_message until closed: true. No prompt acrobatics needed.

Test standalone (no Claude required)

# Run the server on stdio:
uvx negotiate-mcp

# Or, if you've used pip:
python -m negotiate_mcp

Most useful when paired with the mcp CLI to inspect tool definitions and exercise them by hand.

Adding more stores

The connector works against any negotiate.v1-compliant store, not just the Atlas reference (negotiate.pier39.ai). As stores adopt the protocol, just point your shopper agent at their domain — the same five tools work everywhere.

See PROTOCOL.md for the full spec.

Develop locally

git clone https://github.com/sanjana-pier39/negotiate-mcp
cd negotiate-mcp
pip install -e .
python -m negotiate_mcp     # runs on stdio

To publish a new version, see PUBLISH.md.

License

MIT.