FernWX Agent API reference

84 documented GET operations over the FernWX Weather Ledger, described by the OpenAPI 3.1 document at /api/openapi.json. The same operations are tools on the FernWX MCP server at https://fernwx.com/api/mcp. Setup, authentication and OAuth are covered in Developers & AI agents. Every documented operation and MCP tool is a read. Some reads update last-seen timestamps or stale report state, and saved-insight runs append query activity logs; MCP tools declare these side effects. A key or OAuth token is not read-only. It can also call account routes outside the documented contract that write: generate and save AI explanations of soundings and NWS text products and sounding comparison syntheses (these count against the account’s AI usage limits), generate speech audio, import radiosonde soundings into the account (overwrite mode replaces the account’s own earlier imports), and request or release temporary restores of archived days. Each is limited to the owning account and bounded. It cannot change locations, settings or keys, trigger collectors, create or edit saved reports, Run Books, dashboards or insights, or delete the cold archive.