TanStack Query Svelte Debugging

Trace cache state from query key to query function to invalidation and rendered UI before changing behavior. Detect the installed TanStack Query Svelte version before applying v5 store-style or v6 runes-style fixes.

Process

1. State expected behavior, actual behavior, impact, and the smallest reproducible symptom.
2. Gather evidence from code, logs, traces, metrics, generated output, database plans, config, or failing tests before proposing a fix.
3. Detect @tanstack/svelte-query and svelte versions, then isolate whether the failure is cache, query key, SSR, store-style v5 usage, or runes-style v6 migration.
4. Isolate the boundary that fails and compare it with a known working path.
5. Implement one root-cause fix with focused verification or a regression test where feasible.

Coordination

Use this skill together with itsol-task-intake for ambiguous work, itsol-self-review before handoff, and focused security-* or infra-* skills when the change touches trust boundaries or deployment behavior.

Focused References