# Free Backwatch tools

- [MCP Inspector](https://backwatch.dev/tools/mcp-inspector.md): See your MCP server the way an agent finds it from outside: discovery, server card, identity and the sign-in challenge.
- [MCP OAuth Discovery Tester](https://backwatch.dev/tools/oauth-discovery-tester.md): Follow the discovery half of MCP sign-in: the 401 challenge, protected-resource metadata and authorization-server metadata.
- [MCP Sign-In Checker](https://backwatch.dev/tools/mcp-sign-in-checker.md): Check the whole sign-in chain a host follows, and on your own server prove each host's callback can register.
- [llms.txt Checker](https://backwatch.dev/tools/llms-txt-checker.md): Check that your llms.txt exists, parses, and that every link in it resolves.
- [Markdown Negotiation Tester](https://backwatch.dev/tools/markdown-negotiation-tester.md): Check that agents get Markdown when they ask for it, by Accept header or .md URL, with the right Vary header.
- [Agent 404 Tester](https://backwatch.dev/tools/agent-404-tester.md): See what an agent gets on a page that doesn't exist: the status code and whether the body explains where to go.
- [MCP Server Card Validator](https://backwatch.dev/tools/mcp-server-card-validator.md): Check that your MCP server has a server card agents can find, and that the server introduces itself when a client connects.
- [AI Bot Access Checker](https://backwatch.dev/tools/ai-bot-access-checker.md): Check whether AI agents and crawlers can reach your site, what your robots.txt allows them, and whether bot protection turns them away.
- [OpenAPI Discoverability Checker](https://backwatch.dev/tools/openapi-discoverability-checker.md): Check that agents can find your API: an OpenAPI description, an API catalog, Link headers and docs linked from your homepage.
- [Structured Data Checker](https://backwatch.dev/tools/schema-checker.md): Check the JSON-LD on your homepage: what it says you are, how complete it is, and whether it links your official profiles.
- [Page Token Budget Checker](https://backwatch.dev/tools/page-token-budget-checker.md): Check that your pages fit an agent's reading budget and still show their content with JavaScript off.
- [Agent Readiness Report](https://backwatch.dev/tools/agent-readiness-report.md): The full report: all four pillars, every check that applies, and a fix prompt for each failure.