Eval Observability — Coverage Tracking

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A focused module to monitor retrieval coverage during eval and live runs.
Coverage answers the key question: “Did we retrieve enough of the right section to support the answer?”

Why coverage tracking matters

False negatives: The right fact exists, but snippets cover too little of the section.
Over-fragmentation: Documents chunked too aggressively result in coverage <0.50 despite correct snippets.
Hallucinations: When coverage is low, LLMs often fill gaps with fabrications.
Eval blind spots: Benchmarks without coverage probes miss systematic recall failures.

Core definition

Coverage is defined as:

coverage = retrieved_tokens_in_target_section / total_tokens_in_target_section

Target section = gold label or expected answer span.
Threshold = minimum 0.70 in most RAG tasks.
Tolerance = allow 5–10% batch queries below threshold before raising alert.

Probe design

Annotate gold sets For each eval question, mark the expected source section IDs and token spans.
Measure per-query coverage Count how many tokens from expected span were retrieved. Normalize by total tokens in span.
Batch aggregation Track percentage of queries below threshold. Report average coverage ± variance.
Drift detection Compare against historical baseline (previous model or retriever version). If drop >0.05, escalate to retriever/infrastructure team.

Alert thresholds

Metric	Warning	Critical
Per-query coverage	<0.70	<0.60
Batch pass rate	<0.90	<0.80
Drift vs baseline	drop >0.05	drop >0.10

Example probe code (pseudo)

def track_coverage(retrieved, target_span):
    overlap = count_tokens(retrieved, target_span)
    coverage = overlap / len(target_span)
    return coverage

for q in eval_batch:
    cov = track_coverage(q.retrieved_tokens, q.gold_span)
    if cov < 0.70:
        alerts.append({"qid": q.id, "coverage": cov})

Common pitfalls

Ignoring multi-section answers → coverage must sum across all required sections.
Only measuring top-1 snippet → always include top-k, otherwise underestimation occurs.
Static thresholds → thresholds should adapt to doc size and retrieval depth.
No historical baseline → without drift tracking, regressions pass unnoticed.

Reporting dashboards

Histograms of per-query coverage distribution.
Trend lines for batch averages across eval sets.
Drift deltas vs baseline runs.
Heatmaps showing coverage by document or domain.

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🧭 Explore More

Module	Description	Link
WFGY Core	WFGY 2.0 engine is live: full symbolic reasoning architecture and math stack	View →
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Semantic Clinic Index	Expanded failure catalog: prompt injection, memory bugs, logic drift	View →
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Benchmark vs GPT-5	Stress test GPT-5 with full WFGY reasoning suite	View →
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