ottyl/tickets/058-declared-params-not-refreshed-live-in-ui.md

058 — Newly auto-declared params don't appear in the UI until a manual refresh

Summary

auto_declare_params / auto_declare_log_stream_params (src/engine.rs:383, :451) can add new param declarations on any ingested line, but the frontend only ever fetches the param list once, on mount (webapp/src/App.tsx:278-284, fetchParamDeclarations().then(setParams)). The main poll loop (App.tsx:300-350, interval from webapp/src/lib/polling.ts) refetches timeline entries and logs every tick but never re-fetches param declarations — the only other place setParams is called is the onDeclared callback fired by a user's own manual edit in Params.tsx. So a param that gets auto-declared mid-run from freshly ingested lines is invisible in the Params panel until the page is reloaded.

There is no push infrastructure (SSE/websocket) anywhere in the codebase; all live-refresh today is plain polling.

Scope

• Add a periodic (or piggybacked on the existing poll loop) refetch of param declarations in App.tsx, e.g. call fetchParamDeclarations() alongside the existing timeline/log poll in the loop at App.tsx:300-350, or on its own lighter-weight interval if refetching every tick is wasteful.
• Only update state when the declaration list actually changed, to avoid needlessly re-rendering Params.tsx on every poll tick.
• Out of scope: introducing SSE/websocket push infrastructure — polling is consistent with how the rest of the app already refreshes.

Acceptance criteria

• Ingesting new lines that trigger auto-declaration of a previously unseen param causes that param to appear in the Params UI within one poll interval, without a page reload.
• Existing manual param declaration/edit flows (Params.tsx's onDeclared) are unaffected.

Depends on

None.