Agent skill

error-analysis

Systematically identify and categorize failure modes in evaluated traces using Truesight datasets and error-analysis tools. Use when quality issues are unclear, after major pipeline changes, or when incidents indicate drift.

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Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/error-analysis

SKILL.md

Error Analysis

Guide the user through trace-grounded failure analysis and dataset labeling.

Interactive Q&A protocol (mandatory)

Ask one question at a time using the structured question tool (loaded per the HARD-GATE above).

Example question structure:

Which data source should we analyze first?
A) Existing Truesight dataset
B) New dataset to upload
C) Unsure, list datasets first

Rules:

  • One question per message during setup.
  • Use the structured question tool for every question. Structure each with a short header, 2-4 options with labels and descriptions, and place the recommended option first. Do not add "(Recommended)" or similar annotations to option labels.
  • Ask one follow-up if response is ambiguous.

Core workflow

  1. Select or create dataset:
    • If dataset exists, use list_datasets.
    • If not, use upload_dataset.
  2. Collect representative traces:
    • Target approximately 100 traces when possible.
    • Use random plus stratified coverage when volume is high.
  3. Analyze row by row:
    • Use get_dataset_rows with pagination.
    • For each row, call suggest_error_notes.
  4. Persist annotations:
    • Save _ts_error_notes and _ts_error_category with update_dataset_row.
  5. Consolidate categories:
    • Run consolidate_error_categories.
    • Review mapping proposals, then apply with apply_category_mappings.
  6. Prioritize fixes:
    • Report most frequent categories first.
    • Recommend next skill based on failure type:
      • create-evaluation for new evaluation coverage
      • review-and-promote-traces for judgment backlog
      • eval-audit for broader process gaps

Analysis heuristics

  • Focus on first root failure in each trace, not every downstream symptom.
  • Let categories emerge from observed traces, not pre-baked labels.
  • Iterate categories after 20 traces, then relabel for consistency.
  • Stop when recent traces no longer reveal new failure categories.

Anti-patterns

  • Defining categories before reading traces.
  • Treating output quality labels as generic scores without concrete failure modes.
  • Skipping relabel after category definitions change.
  • Building new evaluators before fixing obvious prompt/tooling/engineering gaps.

Scopes reference

  • list_datasets, get_dataset_rows require datasets:read
  • upload_dataset, update_dataset_row, apply_category_mappings require datasets:write
  • suggest_error_notes, consolidate_error_categories require error-analysis:execute

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