Evidence-first ECC Tools burn and billing audit workflow. Use when investigating runaway PR creation, quota bypass, premium-model leakage, duplicate jobs, or GitHub App cost spikes in the ECC Tools repo.

ECC Tools Cost Audit Use this skill when the user suspects the ECC Tools GitHub App is burning cost, over creating PRs, bypassing usage limits, or routing free users into premium analysis paths. This is a focused operator workflow for the sibling [ECC Tools](../../ECC Tools) repo. It is not a generic billing skill and it is not a repo wide code review pass. Skill Stack Pull these ECC native skills into the workflow when relevant: autonomous loops for bounded multi step audits that cross webhooks, queues, billing, and retries agentic engineering for tracing the request path into discrete, provable units customer billing ops when repo behavior and customer impact math must be separated cleanly search first before inventing helpers or re implementing repo local utilities security review when auth, usage gates, entitlements, or secrets are touched verification loop for proving rerun safety and exact post fix state tdd workflow when the fix needs regression coverage in the worker, router, or billing paths When To Use user says ECC Tools burn rate, PR recursion, over created PRs, usage limit bypass, or premium model leakage the task is in the sibling ECC Tools repo and depends on webhook handlers, queue workers, usage reservation, PR creation logic, or paid gate enforcement a customer report says the app created too many PRs, billed incorrectly, or analyzed code without producing a usable result Scope Guardrails work in the sibling ECC Tools repo, not in everything claude code start read only unless the user clearly asked for a fix do not mutate unrelated billing, checkout, or UI flows while tracing analysis burn treat app generated branches and app generated PRs as red flag recursion paths until proved otherwise separate three things explicitly: repo side burn root cause customer facing billing impact product or entitlement gaps that need backlog follow up Workflow 1. Freeze repo scope switch into the sibling ECC Tools repo check branch and local diff first identify the exact surface under audit: webhook router queue producer queue consumer PR creation path usage reservation / billing path model routing path 2. Trace ingress before theorizing inspect src/index. or the main entrypoint first map every enqueue path before suggesting a fix confirm which GitHub events share a queue type confirm whether push, pull request, synchronize, comment, or manual re run events can converge on the same expensive path 3. Trace the worker and side effects inspect the queue consumer or scheduled worker that handles analysis confirm whether a queued analysis always ends in: PR creation branch creation file updates premium model calls usage increments if analysis can spend tokens and then fail before output is persisted, classify it as burn with broken output 4. Audit the high signal burn paths PR multiplication inspect PR helpers and branch naming check dedupe, synchronize event handling, and existing PR reuse if app generated branches can re enter analysis, treat that as a priority 0 recursion risk Quota bypass inspect where quota is checked versus where usage is reserved or incremented if quota is checked before enqueue but usage is charged only inside the worker, treat concurrent front door passes as a real race Premium model leakage inspect model selection, tier branching, and provider routing verify whether free or capped users can still hit premium analyzers when premium keys are present Retry burn inspect retry loops, duplicate queue jobs, and deterministic failure reruns if the same non transient error can spend analysis repeatedly, fix that before quality improvements 5. Fix in burn order If the user asked for code changes, prioritize fixes in this order: 1. stop automatic PR multiplication 2. stop quota bypass 3. stop premium leakage 4. stop duplicate job fanout and pointless retries 5. close rerun/update safety gaps Keep the pass bounded to one to three direct fixes unless the same root cause clearly spans multiple files. 6. Verify with the smallest proving steps rerun only the targeted tests or integration slices that cover the changed path verify whether the burn path is now: blocked deduped downgraded to cheaper analysis or rejected early state the final status exactly: changed locally verified locally pushed deployed still blocked High Signal Failure Patterns 1. One queue type for all triggers If pushes, PR syncs, and manual audits all enqueue the same job and the worker always creates a PR, analysis equals PR spam. 2. Post enqueue usage reservation If usage is checked at the front door but only incremented in the worker, concurrent requests can all pass the gate and exceed quota. 3. Free tier on premium path If free queued jobs can still route into Anthropic or another premium provider when keys exist, that is real spend leakage even if the user never sees the premium result. 4. App generated branches re enter the webhook If pull request.synchronize , branch pushes, or comment triggered runs fire on app owned branches, the app can recursively analyze its own output. 5. Expensive work before persistence safety If the system can spend tokens and then fail on PR creation, file update, or branch collision, it is burning cost without shipping value. Pitfalls do not begin with broad repo wandering; settle webhook queue worker first do not mix customer billing inference with code backed product truth do not fix lower value quality issues before the highest burn path is contained do not claim burn is fixed until the narrow proving step was rerun do not push or deploy unless the user asked do not touch unrelated repo local changes if they are already in progress Verification root causes cite exact file paths and code areas fixes are ordered by burn impact, not code neatness proving commands are named final status distinguishes local change, verification, push, and deployment

ecc-tools-cost-audit