Overview

Period: 2026-04-04T07:26Z to 2026-04-04T10:18Z
Runs analyzed: 4 Secret Digger (Copilot) runs (all had token data); 4 other Copilot-engine runs (no artifacts)
Total tokens: 752K across instrumented workflows
Estimated total cost: $1.16 (Copilot endpoint rates: $2.50/M input, $10/M output)

⚠️ Recurring failure pattern: The retry-loop failure in Secret Digger (Copilot) seen in the previous report has recurred. Run §23975973080 shows the identical stuck pattern — requests 2–7 all return output_tokens = 2 at identical input_tokens = 35,237 — costing 3.5× a normal run ($0.62 vs. $0.18). This is now a confirmed recurring issue.

📉 Documentation Maintainer absent: No doc-maintainer runs observed this period (previously $3.91/run). Total cost is significantly lower as a result.

Workflow Summary

🔍 Optimization Opportunities

1. Secret Digger (Copilot) — recurring retry loop (confirmed bug)

   • Second occurrence in two consecutive daily reports
   • Run §23975973080 (failure): 7 requests vs. normal 2
   • Requests 2–7: all output_tokens = 2 and identical input_tokens = 35,237 — a stuck loop producing no progress
   • Wasted cost: $0.62 vs. $0.18 normal (3.5× overhead); by request 3 cache is fully warm (cache_read = 35,236 = input_tokens) yet output doesn't improve
   • Recommendation: Add a max-iterations guard or detect when consecutive outputs are identical/minimal; escalate to workflow maintainer

2. Cache hit rate plateau at ~30% for normal success runs

   • All 3 success runs show exactly 29.7% cache hit rate — consistent but not improving
   • Request 1 of each run starts cold (0 cache reads), request 2 hits ~29K cached tokens
   • The first request always incurs full input cost; caching only kicks in from request 2+
   • Recommendation: Evaluate whether the static system prompt prefix can be pre-warmed, or structure prompts to maximize the cached prefix length

3. Cache write tokens remain 0 (provider limitation)

   • Consistent across all runs — the Copilot inference endpoint doesn't report cache_write_tokens separately
   • Cost estimates may be slightly underestimated (missing cache write billing)
   • Status: Known limitation, no action needed

Historical Trend

Trend observation: Without the Documentation Maintainer running today, total cost dropped from $5.24 to $1.16 (-78%). The Secret Digger (Copilot) per-run cost is stable at ~$0.18 for successful runs. The retry-loop failure pattern has now occurred in two consecutive daily reports — this warrants immediate attention.

Previous Report

📊 Copilot Token Usage Report 2026-04-03

References:

• §23976844295 — Latest Secret Digger (Copilot) success
• §23975973080 — Failure run with retry loop
• §23976915564 — This report's workflow run

Generated by Daily Copilot Token Usage Analyzer · ◷