Worker Failure Trace Correlator

Group supplied Worker events by trace. Correlate a generic Fetch failed only when earlier evidence exists; leave the rest honestly unresolved.

The ceiling contextualizes memory percentages. It never creates a cause by itself.

Required phases: build, startup, runtime. This local tool does not query Cloudflare, Wrangler, account limits, billing, or status.

Replace one terminal string with its trace.

Load the bundled evidence or paste a normalized export. Missing upstream telemetry remains a visible gap rather than a guessed diagnosis.

Correlate evidence, do not invent causesMemory percentage is context, not proofUnresolved is a useful observability resultTrace order mattersCorrelate evidence, do not invent causesMemory percentage is context, not proofUnresolved is a useful observability resultTrace order matters

Why one trace resolves and another does not.

The rules use explicit same-trace evidence. Product anecdotes and a high memory percentage never substitute for an event.

Memory pressure

A generic fetch is correlated to memory only when an explicit OOM event appears earlier in the same trace. The user ceiling adds context but cannot trigger the classification.

same trace: explicit OOM → Fetch failed = memory_pressure
KV rate limit or Workers AI upstream

A preceding 429/rate-limit event supports kv_rate_limit. Explicit model or inference unavailability supports workers_ai_upstream. Neither rule claims current product status.

429 or rate-limit → Fetch failed = kv_rate_limit
model unavailable → Fetch failed = workers_ai_upstream
Unresolved generic failure

If Fetch failed has no earlier explicit event in its trace, the correct result is unresolved_fetch. The missing evidence is itself the actionable finding.

Fetch failed without explicit precursor = unresolved_fetch
Limitations

This is correlation over supplied evidence, not proof of platform root cause. It does not fetch live logs, status, configuration, billing, cache state, or model availability.

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