--- title: "Glossary — Salterwick Property" description: "What this site's agent-discovery terms mean." last_updated: 2026-09-19 --- # Glossary Source: https://hubspot.demo.busymate.ai/glossary ### MCP (Model Context Protocol) The open protocol an AI assistant uses to call a site's own tools and read its own data over a standard JSON-RPC interface, instead of scraping HTML. This site's MCP server answers at `/mcp`; its card is at `/.well-known/mcp.json`. ### WebMCP The in-page twin of MCP: the page itself registers tools on `document.modelContext`, so a browser-based agent can act on exactly what a visitor sees, without leaving the page. See `/webmcp-catalog.json`. ### llms.txt A short, curated Markdown index of a site's key pages and what an assistant can do with it — the first file an agent should read. See `/llms.txt`. ### agents.json This site's bespoke discovery card (name, description, MCP/WebMCP endpoints, tools, identity, human hand-off) — see `/agents.json`. The DIFFERENT `/.well-known/agents.json` document below follows a separate community schema. ### agents.json (v0.1.0 tool-actions schema) A community schema (agentsjson.org) describing a site's callable operations as "flows" over an OpenAPI source, referenced by `operationId`. Served at `/.well-known/agents.json` — a different document from the bare `/agents.json` card above. ### AGENTS.md The agents.md convention's free-form contextual guide for a coding/AI agent working with this project — what it is, how to read it, what it may do. See `/AGENTS.md`. ### OpenAPI A machine-readable, industry-standard description of an HTTP API's operations and schemas. See `/openapi.json`. ### A2A (Agent-to-Agent protocol) A protocol for one AI agent to discover and call another agent as a peer, via an Agent Card. This demo does not implement A2A: `/.well-known/agent-card.json` answers an honest 404 rather than a fabricated card. ### MCP Server Card A small, standard document describing an MCP server's identity and how to reach it (never its live tool list, which stays behind the protocol itself). See `/.well-known/mcp.json`. ### Content negotiation Asking the SAME URL for a different representation via the `Accept` header — `Accept: text/markdown` on any page here returns its Markdown twin at the same address, no redirect. ### Structured data (JSON-LD) Machine-readable facts embedded in a page's own HTML (`