LangBot Space MCP Operations

LangBot Space (space.langbot.app) exposes an MCP server so user-facing AI agents can browse and search the marketplaces (plugins, MCP servers, skills) and rank live models for automated setup.

Endpoint

https://space.langbot.app/mcp

Transport: streamable HTTP (stateless, JSON responses). For a self-hosted Space instance: http://<host>:8383/mcp.

Authentication

Reuses the existing Personal Access Token (PAT) — the same token the lbp CLI uses. Create one in your Space account (Profile → Personal Access Tokens), then send it as a Bearer token:

Authorization: Bearer lbpat_...uests without a valid PAT get `401 Unauthorized`.

## Client configuration

```json
{
  "mcpServers": {
    "langbot-space": {
      "url": "https://space.langbot.app/mcp",
      "headers": { "Authorization": "Bearer <your-pat>" }
    }
  }
}

Tool surface

list_* and search_* are paged (page, page_size). get_* takes author + name. The tool surface mirrors the REST endpoints under /api/v1/marketplace/*; select_models mirrors /api/v1/models/selection. All tools are read-only.

How to use

1. Create a PAT in your Space account settings.
2. Point your MCP client at https://space.langbot.app/mcp with the Bearer PAT.
3. Use search_plugins / search_mcp_servers / search_skills to find items, then get_* for details (e.g. to obtain author/name for installation in LangBot itself).
4. For automatic local-agent setup, call select_models (optionally with category) and choose the first compatible item. Ordering is latest probe state (available, unprobed, unavailable), then Space recommendation. Each item includes availability.up, last_probed_at, latency, and HTTP status.

Implementation & maintenance (for Space developers)

• Server: internal/controller/mcp/server.go (official Go MCP SDK github.com/modelcontextprotocol/go-sdk). Tools call the service layer (PluginService, MCPService, SkillService, ModelStatusService) directly.
• Mount: internal/controller/api.go at /mcp and /mcp/*any.
• Auth: PAT via AccountService.ValidatePersonalAccessToken.
• Docs: docs/MCP_SERVER.md.

When you add, remove, or change a marketplace API endpoint that should be agent-accessible, update the corresponding MCP tool and this skill. The MCP tool surface and the API must stay aligned (see AGENTS.md).

Pitfalls

• The PAT prefix is lbpat_ (Space), distinct from LangBot's lbk_ API keys.
• This server is read/browse only; it does not publish or modify marketplace items. Use the web UI or REST API (with appropriate auth) for that.