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antigravity-skills-reference/skills/progressive-estimation/SKILL.md
Stanislav Shymanskyi 2a7580147d feat: add progressive-estimation skill for AI-assisted development estimation (#260)
Co-authored-by: Stas <stas@mac-1.home>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-10 19:14:36 +01:00

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name, description, category, risk, source, date_added, author, tags, tools
name description category risk source date_added author tags tools
progressive-estimation Estimate AI-assisted and hybrid human+agent development work with research-backed PERT statistics and calibration feedback loops project-management safe community 2026-03-10 Enreign
estimation
project-management
pert
sprint-planning
ai-agents
claude

Progressive Estimation

Estimate AI-assisted and hybrid human+agent development work using research-backed formulas with PERT statistics, confidence bands, and calibration feedback loops.

Overview

Progressive Estimation adapts to your team's working mode — human-only, hybrid, or agent-first — applying the right velocity model and multipliers for each. It produces statistical estimates rather than gut feelings.

When to Use This Skill

  • Estimating development tasks where AI agents handle part of the work
  • Sprint planning with hybrid human+agent teams
  • Batch sizing a backlog (handles 5 or 500 issues)
  • Staffing and capacity planning with agent multipliers
  • Release date forecasting with confidence intervals

How It Works

  1. Mode Detection — Determines if the team works human-only, hybrid, or agent-first
  2. Task Classification — Categorizes by size (XSXL), complexity, and risk
  3. Formula Application — Applies research-backed multipliers grounded in empirical studies
  4. PERT Calculation — Produces expected values using three-point estimation
  5. Confidence Bands — Generates P50, P75, P90 intervals
  6. Output Formatting — Formats for Linear, JIRA, ClickUp, GitHub Issues, Monday, or GitLab
  7. Calibration — Feeds back actuals to improve future estimates

Examples

Single task:

"Estimate building a REST API with authentication using Claude Code"

Batch mode:

"Estimate these 12 JIRA tickets for our next sprint"

With context:

"We have 3 developers using AI agents for ~60% of implementation. Estimate this feature."

Best Practices

  • Start with a single task to calibrate before moving to batch mode
  • Feed back actual completion times to improve the calibration system
  • Use "instant mode" for quick T-shirt sizing without full PERT analysis
  • Be explicit about team composition and agent usage percentage

Common Pitfalls

  • Problem: Overconfident estimates Solution: Use P75 or P90 for commitments, not P50

  • Problem: Missing context Solution: The skill asks clarifying questions — provide team size and agent usage

  • Problem: Stale calibration Solution: Re-calibrate when team composition or tooling changes significantly

  • @sprint-planning - Sprint planning and backlog management
  • @project-management - General project management workflows
  • @capacity-planning - Team velocity and capacity planning

Additional Resources