[utsab345]

Summary

Completes v0.2 documentation for merged features: failure minimization and fork-at-step debugging. Updates README, CHANGELOG, and adds comprehensive fork-at-step documentation.

What's Included

New Documentation

docs/fork.md - Complete fork-at-step guide:

• Overview and quick start examples
• Fork points (by step or event ID)
• Override system (Python API only)
• CLI and Python API reference
• Use cases and complete examples
• Provenance tracking and trace integrity
• Error handling and best practices
• Documented limitations

Updated Documentation

README.md:

• Updated Key Capabilities to include minimize and fork
• Updated v0.2 roadmap to show fork-at-step as implemented (not planned)
• Added documentation links

CHANGELOG.md:

• Expanded v0.2 section with complete fork-at-step details
• Added fork features, API, and limitations
• Updated description to mention both minimize and fork

Implementation Status

✅ Merged and Documented

1. Failure Minimization (PR feat: add failure minimization via delta debugging #11)

   • CLI: stepfork minimize
   • Python API: stepfork.minimize
   • Documentation: docs/minimize.md
   • Tests: 44 minimize-specific tests

2. Fork-at-Step (PR feat: add foundational fork-at-step trace support #12)

   • CLI: stepfork fork --at-step N or --at-event ID
   • Python API: stepfork.fork module
   • Documentation: docs/fork.md (NEW)
   • Tests: 43 fork-specific tests

📋 Documented Limitations

Fork-at-Step:

• ❌ CLI does not support overrides (Python API only)
• ❌ Does not automatically continue execution from fork point
• ❌ Replay integration not yet implemented (requires separate replay call)
• ❌ No automatic divergence detection for forked traces
• ❌ Cannot override inputs (only outputs: tool_result, llm_response)

These limitations are clearly documented in:

• docs/fork.md Limitations section
• CHANGELOG.md v0.2 Limitations section
• Inline in code examples showing the workaround

Quality Verification

✅ 523 tests pass (44 minimize + 43 fork + 436 existing)
✅ mypy --strict passes (56 source files)
✅ ruff check passes
✅ ruff format passes (109 files)

Files Changed

• README.md - Updated roadmap and key capabilities
• CHANGELOG.md - Expanded v0.2 section
• docs/fork.md - New comprehensive documentation (580+ lines)

Verification Steps

# All tests pass
uv run pytest tests/ -q
# 523 passed

# Type safety verified
uv run mypy src/stepfork/ --strict
# Success: no issues found

# Code quality verified
uv run ruff check src/ tests/
uv run ruff format --check src/ tests/
# All checks passed

What's Next (Future Work)

The following features are documented as limitations and could be addressed in future PRs:

1. Replay Integration with Overrides - Seamless fork → replay workflow
2. Divergence Detection - Track when replays diverge from forked traces
3. CLI Override Support - Add --override flags to fork command
4. End-to-End Tests - record → fork → override → replay workflows

These are intentionally deferred to keep this PR focused on documentation completion.

Readiness for v0.2

This PR completes the v0.2 documentation. The current state:

Ready to Release

• ✅ Failure minimization (fully implemented and documented)
• ✅ Fork-at-step core functionality (implemented and documented)
• ✅ All features tested and type-safe
• ✅ Limitations clearly documented

Not in v0.2 (Future Work)

• ❌ Replay integration with fork overrides
• ❌ Baselines (roadmap item)
• ❌ CLI override support

v0.2 can be released with the current implementation. Replay integration can be v0.3 or a v0.2.1 enhancement.

🤖 Generated with Claude Code