Overview

Period: 2026-04-03T06:34Z to 2026-04-03T10:23Z
Runs analyzed: 10 Copilot-engine runs (6 had token data)
Total tokens: 3,853K across all instrumented workflows
Estimated total cost: $5.24

🆕 New workflow with token data: Documentation Maintainer appears for the first time with 32 requests and $3.91 per run. This is by far the most expensive workflow and warrants attention.

⚠️ Failure anomaly: One Secret Digger (Copilot) run failed after entering a retry loop (7 requests, requests 2–7 all returned 2 output tokens at identical input sizes), costing 3.4× a normal run.

Workflow Summary

🔍 Optimization Opportunities

1. Documentation Maintainer — 32 requests, $3.91/run (new)

   • First observed run, 3M total tokens, 32 LLM calls in ~3.5 minutes
   • Input grows steadily from 33K → 55K per request (accumulating context), while output is tiny (avg 229 tokens)
   • 408:1 I/O ratio — almost entirely system prompt + tool schemas
   • 48.7% cache hit rate helps, but first request is always cold (0 cache reads)
   • Recommendations:
     • Audit whether 32 requests is expected for a doc maintenance task; if iterating over many files, consider batching
     • Enable cache breakpoints on the static system prompt prefix to warm the cache on request 1 (currently only warms from request 2+)
     • Review MCP tool surface — large tool schemas inflate input on every call

2. Secret Digger (Copilot) failure run — retry loop detected

   • Run §23942926212 (failure): 7 requests vs. normal 2
   • Requests 2–7 all had output_tokens = 2 and identical input_tokens = 35,039 — a clear retry/stuck loop
   • Cost: $0.62 vs. $0.18 for a normal run (3.4×) — wasted cost from repeated identical calls
   • Recommendation: Investigate what causes the Secret Digger workflow to loop on identical input without making progress; consider adding a max-iterations guard

3. Cache write tokens still 0 across all workflows (provider limitation)

   • Consistent with previous reports — the Copilot inference endpoint doesn't report cache_write_tokens separately
   • Cost estimates may be slightly underestimated (cache writes billed at $3.75/M for Sonnet)
   • Recommendation: No action needed; tracked as a known limitation

Historical Trend

Comparison to previous report #1604 (2026-04-02, 15:43–16:21 UTC):

Total cost trend: $1.48 (previous) → $5.24 (today) — primarily due to Documentation Maintainer being a new, high-cost workflow. Smoke Copilot and Build Test Suite did not run today on main.

Secret Digger normal runs remain stable at $0.18/run, consistent with the first report (April 1).

Previous Report

#1604 — 📊 Copilot Token Usage Report 2026-04-02

References:

• §23936885217 — Documentation Maintainer
• §23942926212 — Secret Digger (Copilot) failure
• §23941423866 — Secret Digger (Copilot) success

Generated by Daily Copilot Token Usage Analyzer · ◷