Api Error Report

API Error Report

Drill into APIError events: how many, when, where, and most likely why.

Input

The user provides: $ARGUMENTS

This may be:

• empty or "all" — report on every APIError in the recent window (default)
• a session ID — report APIErrors for that one session only
• a window like "today" or "last 7d" — restrict the time range
• a cause filter: "rate-limit", "overload", or "context"

Data Sources

| Endpoint | Returns | |----------|---------| | GET /api/analytics | event_types (total APIError count), daily_events (365d) — APIError volume and trend over time | | GET /api/events?session_id=X | Per-session event stream — each APIError carries summary, data, and timestamp used to classify the cause | | GET /api/sessions?limit=N | Sessions with id, model, started_at — attribute each error to a model and place it on the timeline |

Report Sections

1. Volume & Trend

From GET /api/analytics: total APIError count and its share of total_events. Use daily_events to chart APIErrors over the requested window and flag any day that spikes above the window mean.

2. Affected Sessions & Models

For each session in scope, pull GET /api/events?session_id=X and collect APIError events. Group by session_id and, via GET /api/sessions, by model. Report the top affected sessions and which model accounts for the most errors.

3. Likely Cause Classification

Inspect each error's summary/data and bucket it:

• Rate limit — mentions 429, "rate limit", "quota", or retry-after.
• Overload — mentions 529, "overloaded", or capacity.
• Context — mentions context length, token limit, or "too long" (correlate with nearby Compaction events).
• Other — anything else; quote the summary.

Report the count and percentage in each bucket.

4. Timeline

List the most recent APIErrors with timestamp, session_id, model, classified cause, and a one-line summary excerpt.

Output

• A Markdown table per section (volume, by model, by cause).
• Rates as percentages to 2 decimals; any currency in USD to 4 decimals.
• Cite exact session_id, model, timestamp, and summary values — never invent a cause not supported by the payload; bucket as "Other" when unclear.
• End with the dominant cause and a concrete mitigation (e.g., back off and retry on 529, reduce context to cut context errors, slow request rate on 429).
• Read-only: only report what the API returns. If curl cannot reach http://localhost:4820, tell the user to start the dashboard with npm start from the repo root.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: hoangsonww
• Source: hoangsonww/Claude-Code-Agent-Monitor
• License: MIT
• Homepage: https://hoangsonww.github.io/Claude-Code-Agent-Monitor/

Install and usage instructions live in the source repository linked above.