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Root cause of the 'first warmup misses' + 'switch to chat misses' bugs:
Anthropic keys the MESSAGE-level prompt cache on `tool_choice` AND the
extended-thinking parameters (both rows in their cache-invalidation table mark
the messages cache as invalidated on change). The original warmCache() sent
toolChoice:'none' and NO thinking providerOptions, while real turns send
toolChoice:'auto' + thinking config for the effort. So warming and chat wrote
TWO different message-cache buckets:
- warmup #1 missed (no warm-only bucket existed yet), every later warmup hit
its own bucket;
- the next real chat message read the OTHER bucket → miss.
Fix: extract a shared buildStreamOptions() that produces the cache-affecting
params (toolChoice + thinking providerOptions + maxOutputTokens). Both run()
and warmCache() now call it with the SAME resolved reasoning effort, so the
warming replay refreshes the exact cache the next real message reads. The
trivial probe turn is still appended AFTER the last cache breakpoint, so it
never disturbs the cached prefix.
Threaded the per-tab reasoning effort (per-model -> per-tab selector -> default,
mirroring processMessage) from the frontend resolver through POST /chat/warm to
warmCacheForTab to warmCache.
Tests: updated the warmCache toolChoice test to assert it MATCHES a real turn,
added an invariant test driving run() and warmCache() and asserting identical
cache-affecting params, and assert effort forwarding in the frontend store.
check / test (780) / frontend build / typecheck all green.
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Keep a tab's provider prompt-cache warm while idle by periodically replaying
the exact cached conversation prefix plus a single trivial throwaway turn,
resetting the provider's ~5-min cache TTL so the user's next real message hits
a warm cache.
Backend:
- Agent.warmCache(history): extracts buildLlmContext() shared with run(), then
re-sends the identical system+tools+history prefix (same Anthropic
cache_control breakpoints) plus a 'reply with just a .' probe turn via
toolChoice:none. Returns the request usage; mutates no history, emits/persists
nothing.
- AgentManager.warmCacheForTab(): resolves the same agent the next real turn
would use, replays the FULL genuine history, refuses while a turn is running.
- POST /chat/warm: returns ONLY the warming request's usage (never persisted,
never folded into the real usage aggregate).
Frontend:
- cache-warming.svelte.ts store: per-tab 4-min repeating idle timer with
countdown, warming-specific last-request cache %, and error capture. Arms on
turn end, pauses during a turn, disables+resets on a real user message.
- cache-warm-storage.ts: per-tab localStorage persistence of the toggle.
- Lifecycle hooks wired into tabs.svelte.ts (status/statuses/sendMessage/
hydrate/create/open/close).
- ModelSelector: bottom-of-panel checkbox + debug strip (last-% / countdown /
error), shown only when enabled. Warming cache data never touches the real
Cache Rate view.
Tests: core warmCache (5), api warm route (3) + warmCacheForTab (3), frontend
store (12) + storage (10). check / test (779) / frontend build / typecheck all
green.
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