A sidecar is dasLLAMA's per-box tune manifest: which JIT kernel variant won in each of ~40 families, 23 tuned runtime scalars, and the provenance to prove where it came from. Producing one costs about 12 minutes of quiet machine. dasllama-server picks a matching sidecar up automatically at startup — this page is the manual browse.
Entries render client-side from /api/sidecars; expanding one fetches the sidecar document itself — kernel winners, race margins and runtime knobs all come from that file, never from this page.
The first start asks once whether to use the exchange — Accept and every later start matches your box automatically, one code path; Decline and the box tunes itself locally. Setting the exchange policy yourself - exchange_* keys in a hand-written config, or the DASLLAMA_EXCHANGE_* environment - skips the question: it IS the answer. Manual download is for air-gapped boxes and for people who want to read the manifest before trusting it.
The process exits with code 3; the watchdog relaunches it, and the fresh compile stamps the downloaded winners. The @sidecar lines are structured events the watchdog folds into its tray.