@copass/mcp

@copass/mcp

Standalone MCP server for Copass. Exposes retrieval + Context Window as MCP tools for any client — Claude Code, Claude Desktop, Cursor, Claude Agent SDK, or your own.

Prerequisites

Install the Copass CLI and bootstrap your account:

npm install -g @copass/cli
copass login                             # email OTP
copass setup                             # creates a sandbox, writes .olane/refs.json
copass apikey create --name my-mcp       # prints an olk_... key — shown once, save it

Two values feed the MCP server config:

Output	Use as
olk_... key printed by copass apikey create	COPASS_API_KEY
sandbox_id in ./.olane/refs.json	COPASS_SANDBOX_ID

Ingest some content so the tools have something to return:

copass ingest path/to/file.md

Connect your MCP client

Drop this into your client's MCP config, pasting the two values from the previous step:

{
  "mcpServers": {
    "copass": {
      "command": "npx",
      "args": ["-y", "@copass/mcp"],
      "env": {
        "COPASS_API_KEY": "olk_your_api_key",
        "COPASS_SANDBOX_ID": "sb_your_sandbox_id"
      }
    }
  }
}

Config locations:

Client	Config file
Claude Code	~/.claude.json (per-user) or ./.mcp.json (per-project)
Claude Desktop	~/Library/Application Support/Claude/claude_desktop_config.json (macOS)
Cursor	~/.cursor/mcp.json
Claude Agent SDK	Whatever your SDK app loads

Restart the client after editing. If you see copass in the tool picker, you're live.

Verify

Ask Claude "what tools do you have from copass?" — it should list discover, interpret, search, context_window_create, context_window_add_turn, context_window_attach, context_window_close, ingest.

Then try: "Use context_window_create and then discover anything about checkout retry behavior." If retrieval returns something, you're end-to-end.

Tools

Retrieval:

• discover — ranked menu of relevant context
• interpret — brief pinned to picked items
• search — full synthesized answer

Context Window — persistent, window-aware memory across turns:

• context_window_create — open a new window (returns data_source_id)
• context_window_add_turn — log a user / assistant / system turn
• context_window_attach — resume an archived window by id
• context_window_close — close the active window

Writeback:

• ingest — push durable content into the graph

All retrieval tools are automatically window-aware when a window has been created in the session — no id threading needed from the LLM. The server holds one "active" window and uses it implicitly; multi-window callers pass data_source_id explicitly.

Why this, not the direct SDK adapters

• Zero code. Config-only integration with every MCP-speaking client.
• Works with Anthropic's managed stack. Claude Code, Desktop, Cursor, and Agent SDK all speak MCP natively.
• Persistent server process. Unlike the shell-out pattern, @copass/mcp holds windows, clients, and sessions in memory across tool calls.

Environment

Variable	Required	Default
COPASS_API_KEY	✅	—
COPASS_SANDBOX_ID	✅	—
COPASS_API_URL	—	https://ai.copass.id
COPASS_PROJECT_ID	—	(none)
COPASS_PRESET	—	auto
COPASS_INGEST_DATA_SOURCE_ID	—	(none — required for ingest unless passed per call)
COPASS_CONTEXT_WINDOW_ID	—	(none — if set, the server auto-attaches to this window on startup and makes it the active window)
COPASS_CONTEXT_WINDOW_INITIAL_TURNS	—	(none — JSON array of {role, content} used to seed the window's turn buffer on startup so retrieval is window-aware from the first tool call)

Pre-attaching a Context Window

If a parent process (HTTP server, agent runtime, orchestrator) has already created a Context Window via @copass/core and is launching @copass/mcp as a subprocess, pass the window's data_source_id as COPASS_CONTEXT_WINDOW_ID so retrieval is window-aware from the first tool call — no need for the LLM to call context_window_create / context_window_attach itself.

Since the MCP subprocess is ephemeral (often one per turn), the Context Window's local turn buffer resets on each spawn. To keep retrieval window-aware across turns, the parent process should track prior turns and serialize them as JSON into COPASS_CONTEXT_WINDOW_INITIAL_TURNS before each spawn:

{
  "mcpServers": {
    "copass": {
      "command": "npx",
      "args": ["-y", "@copass/mcp"],
      "env": {
        "COPASS_API_KEY": "...",
        "COPASS_SANDBOX_ID": "...",
        "COPASS_CONTEXT_WINDOW_ID": "ds_xxx",
        "COPASS_CONTEXT_WINDOW_INITIAL_TURNS": "[{\"role\":\"user\",\"content\":\"...\"},{\"role\":\"assistant\",\"content\":\"...\"}]"
      }
    }
  }
}

This is exactly how the create-copass-agent scaffold wires subprocess-per-turn: the Hono server maintains a Map<threadId, ChatMessage[]> and re-serializes on every spawn.

Programmatic use

Embedding in your own server? Use the building blocks directly:

import { buildServer, loadConfig } from '@copass/mcp';
import { CopassClient } from '@copass/core';
import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';

const config = loadConfig();
const client = new CopassClient({ auth: { type: 'bearer', token: config.api_key } });
const server = buildServer({ client, config });
await server.connect(new StdioServerTransport());

Related

• @copass/core — the client SDK powering this server
• @copass/ai-sdk, @copass/langchain, @copass/mastra, copass-pydantic-ai — direct-SDK adapters for non-MCP consumers

License

MIT