---

name: plan-validation description: | Validates implementation plan execution by verifying success criteria and identifying deviations. This skill should be used after a phase or plan has been implemented and committed. It runs automated checks (tests, types, lint), compares actual changes against the plan's specifications, and generates a validation report documenting what was completed, what deviated, and what needs manual testing.

Plan Validation

Overview

Validate that an implementation plan phase was correctly executed by running automated checks, comparing changes against the plan's specifications, and generating a validation report that documents completion status, deviations, and required manual testing.

When to Use

• After implementing a phase from an implementation plan
• After committing changes for a phase (validation works best with commits to analyze)
• Before proceeding to the next phase (as a gate check)
• When asked to verify or validate implementation work

Scripts

The base directory for this skill is provided when loaded.

Via Justfile

just -f {base_dir}/justfile <recipe> [args...]

Recipe	Arguments	Description
render	findings.json	Render to stdout
render-stdin	-	Render from piped JSON to stdout
save	findings.json output_dir	Save with auto-generated filename
save-stdin	output_dir	Pipe JSON, save to directory
schema	-	Show the expected JSON schema

Direct Execution

uv run {base_dir}/scripts/render_report.py <findings.json> [--output-dir <dir>]

Examples

# Render to stdout, redirect to file
just -f {base_dir}/justfile render /tmp/findings.json > thoughts/shared/validate/report.md

# Render from stdin
echo '{"plan": "..."}' | just -f {base_dir}/justfile render-stdin > report.md

# Save with auto-generated filename (use absolute path)
just -f {base_dir}/justfile save /tmp/findings.json /absolute/path/to/validate/

# Direct execution with output directory
uv run {base_dir}/scripts/render_report.py findings.json --output-dir thoughts/shared/validate

Note: When using save recipes, pass an absolute path for output_dir to ensure correct placement.

Required Inputs

To validate a plan phase, the following information is needed:

Input	Description	Example
Plan path	Location of the implementation plan	thoughts/shared/plans/2026-01-03_core-graph-validation-fixes.md
Phase number	Which phase to validate	Phase 1
Worktree path	Working directory (if using worktrees)	.trees/plan-1-core-graph

Validation Workflow

Step 1: Read the Plan Phase

1. Read the full implementation plan
2. Locate the specific phase to validate
3. Extract:
   • What changes were specified
   • Success criteria (automated and manual)
   • Files that should have been modified

Step 2: Gather Evidence

Run commands to understand what was implemented:

# Check recent commits
git log --oneline -n 10

# See what changed
git diff HEAD~N..HEAD  # Where N covers the phase's commits

# Check current status
git status

Step 3: Run Automated Verification

Execute the success criteria commands from the plan. Common patterns:

# TypeScript/JavaScript projects
bun test                    # Run tests
bun run typecheck          # Type checking
bun run lint               # Linting

# Or if using make
make check                  # Combined checks
make test                   # Tests only
make build                  # Build verification

Document each result as pass (✓) or fail (✗).

Step 4: Compare Against Plan

For each item in the phase:

1. Check completion claims - If the plan marks something as done, verify the code exists
2. Verify implementation matches spec - Does the code do what the plan specified?
3. Look for deviations - Improvements, shortcuts, or missing pieces
4. Assess edge cases - Were error conditions handled?

Use codebase analysis as needed:

• codebase-locator to find modified files
• codebase-analyzer to examine implementation details
• codebase-pattern-finder to verify patterns were followed

Step 5: Generate Validation Report

Structure findings as JSON and use the render script:

{
  "plan": "plan-alias",
  "plan_path": "thoughts/shared/plans/...",
  "phase": 1,
  "phase_title": "Graph Logic Fixes",
  "branch": "implement/plan-1",
  "commit": "abc1234",
  "verdict": "PROCEED",
  "summary": "Phase 1 implemented correctly with all tests passing.",
  "code_review": {
    "critical": [],
    "warnings": [],
    "suggestions": ["Consider adding edge case test"],
    "patterns": {"passed": ["Error handling", "Naming conventions"], "concerns": []}
  },
  "plan_validation": {
    "checks": {
      "tests": {"result": "pass", "detail": "665 pass, 0 fail"},
      "types": {"result": "pass", "detail": "clean"},
      "lint": {"result": "pass", "detail": "no issues"}
    },
    "steps": [
      {"id": "1.1", "description": "Write failing tests", "status": "complete"},
      {"id": "1.2", "description": "Remove parent blocking", "status": "complete"}
    ],
    "deviations": [],
    "manual_tests": ["Verify backlog blocked shows correct count"]
  },
  "next_steps": ["Proceed to Phase 2"]
}

Then render:

just -f {base_dir}/justfile render findings.json > thoughts/shared/validate/report.md

Validation Checklist

Always verify:

• All phase steps marked complete are actually implemented
• Automated tests pass (bun test)
• Type checking passes (bun run typecheck)
• Linting passes (bun run lint)
• Code follows existing codebase patterns
• No regressions introduced (existing tests still pass)
• Error handling is present and robust
• Success criteria from plan are met

Report Output

The render_report.py script generates a structured markdown report with:

1. Header - Plan, phase, branch, commit, date
2. Verdict - PROCEED / PROCEED WITH NOTES / BLOCKED with summary
3. Part 1: Code Review - Critical issues, warnings, suggestions, pattern compliance
4. Part 2: Plan Validation - Automated checks table, implementation status, deviations, manual tests
5. Next Steps - Action items based on verdict

The script handles all formatting mechanically. Focus on gathering accurate findings in the JSON structure.

After Validation

1. Save the report to thoughts/shared/validate/
2. Run thoughts sync to commit the validation report
3. Present findings to the user with:
   • Summary: Pass/Fail/Partial
   • Critical issues requiring attention
   • Path to full report
   • Recommendation: proceed or fix first