Install and use justdown — the `jd` binary and its MCP server over a library of `.jd` files. justdown is an execution + knowledge + record tool in one — capture a proven procedure once, then run it deterministically as a shell dispatch (`jd get <ref> --justfile | just --justfile - <recipe>`) instead of re-reasoning it with the model. Use when the justdown MCP tools (mcp__*justdown*: search/get/ls/links/path/resolve) are missing or not yet installed, when `jd` is not on PATH, or when you need to look up `.jd` knowledge or call a `.jd` tool and the tools aren't available. Bootstraps the `jd` binary and registers the justdown MCP on first use, then teaches the lookup and execution verbs.
2026-07-10