Verification Before Completion

When to use this skill

Use Verification Before Completion when an AI agent needs a reusable SKILL.md workflow for this job: Use when about to claim work is complete, fixed, or passing, before committing or creating PRs - requires running verification commands and confirming output before making any success claims; evidence before assertions always

When not to use it

Skip Verification Before Completion when the task is outside the coding category, or when a more specific skill in this directory already covers the same workflow with clearer triggers.

How to install

1. Personal install: create ~/.claude/skills/verification-before-completion/SKILL.md (and any bundled scripts) so Claude Code, Claude Desktop, and compatible agents can load it in every project.
2. Project install: commit the same folder at .claude/skills/verification-before-completion/ so teammates get the skill with the repo.
3. Restart the agent session after copying files so it re-scans the skills directory, then ask for the task in words that match the skill description.

Full install guide for Claude, Cursor, and Codex

What this skill does

# Verification Before Completion

## Overview

**Core principle:** Evidence before claims, always.

**Violating the letter of this rule is violating the spirit of this rule.**

## The Iron Law

``` NO COMPLETION CLAIMS WITHOUT FRESH VERIFICATION EVIDENCE ```

If you haven't run the verification command in this message, you cannot claim it passes.

## The Gate Function

``` BEFORE claiming any status or expressing satisfaction:

1. IDENTIFY: What command proves this claim? 2. RUN: Execute the FULL command (fresh, complete) 3. READ: Full output, check exit code, count failures 4. VERIFY: Does output confirm the claim? - If NO: State actual status with evidence - If YES: State claim WITH evidence 5. ONLY THEN: Make the claim

Skip any step = lying, not verifying ```

## Common Failures

| Claim | Requires | Not Sufficient | |-------|----------|----------------| | Tests pass | Test command output: 0 failures | Previous run, "should pass" | | Linter clean | Linter output: 0 errors | Partial check, extrapolation | | Build succeeds | Build command: exit 0 | Linter passing, logs look good | | Bug fixed | Test original symptom: passes | Code changed, assumed fixed | | Regression test works | Red-green cycle verified | Test passes once | | Agent completed | VCS diff shows changes | Agent reports "success" | | Requirements met | Line-by-line checklist | Tests passing |

## Red Flags - STOP

- Using "should", "probably", "seems to" - Expressing satisfaction before verification ("Great!", "Perfect!", "Done!", etc.) - About to commit/push/PR without verification - Trusting agent success reports - Relying on partial verification - Thinking "just this once" - Tired and wanting work over - **ANY wording implying success without having run verification**

## Rationalization Prevention

| Excuse | Reality | |--------|---------| | "Should work now" | RUN the verification | | "I'm confident" | Confidence ≠ evidence | | "Just this once" | No exceptions | | "Linter passed" | Linter ≠ compiler | | "Agent said success" | Verify independently | | "I'm tired" | Exhaustion ≠ excuse | | "Partial check is enough" | Partial proves nothing | | "Different words so rule doesn't apply" | Spirit over letter |

## Key Patterns

**Tests:** ``` ✅ [Run test command] [See: 34/34 pass] "All tests pass" ❌ "Should pass now" / "Looks correct" ```

**Regression tests (TDD Red-Green):** ``` ✅ Write → Run (pass) → Revert fix → Run (MUST FAIL) → Restore → Run (pass) ❌ "I've written a regression test" (without red-green verification) ```

**Build:** ``` ✅ [Run build] [See: exit 0] "Build passes" ❌ "Linter passed" (linter doesn't check compilation) ```

**Requirements:** ``` ✅ Re-read plan → Create checklist → Verify each → Report gaps or completion ❌ "Tests pass, phase complete" ```

**Agent delegation:** ``` ✅ Agent reports success → Check VCS diff → Verify changes → Report actual state ❌ Trust agent report ```

## When To Apply

**ALWAYS before:** - ANY variation of success/completion claims - ANY expression of satisfaction - ANY positive statement about work state - Committing, PR creation, task completion - Moving to next task - Delegating to agents

**Rule applies to:** - Exact phrases - Paraphrases and synonyms - Implications of success - ANY communication suggesting completion/correctness

Intended uses

• Use Verification Before Completion when this documented workflow matches the task.