Hoist AI
Start building

What is MCP?

An open protocol for connecting AI assistants to external tools and data sources via OAuth-scoped tool calls.

Model Context ProtocolLast updated 2026-05-15

The Model Context Protocol (MCP) is an open, JSON-RPC-based protocol that lets AI hosts (Claude Desktop, ChatGPT, Cursor, Cline, Gemini CLI, etc.) call external tools in a consistent way. Anthropic published the protocol; the broader community has adopted it.

What it means for Hoist

We expose Hoist at https://mcp.hoistai.com/mcp over Streamable HTTP only. A host is compatible only after it completes OAuth, discovers Hoist tools, and returns a visible Hoist tool result; a config snippet alone is not proof. Tool availability depends on account and source readiness. Paid PPSR searches and pricing are not currently available through Hoist.

Components

  • Tools - documented actions the agent can call. abn_lookup is live with approved access; snapshot-backed source tools return source_unavailable until their complete, trusted source loads. PPSR schemas are future contracts and current preview or paid-search calls fail closed.
  • Tool descriptions - natural-language strings the LLM reads to decide whether to call a tool.
  • OAuth 2.1 + Resource Indicators - scoped, auditable authorisation.
  • Cost hints - annotations that let hosts surface a price confirmation natively.

Install

See /docs/mcp for per-host install snippets.

How Hoist uses this

We run an MCP server at https://mcp.hoistai.com/mcp. See /docs/mcp for install instructions per host.

Sources