completion-check

completion-check is a skill for Claude Code from vibeeval/vibecosystem. It costs 10 tokens per session (693 once invoked), scanned B, a copy of completion-check, MIT.

A checklist for verifying that infrastructure code is actually connected to the system and used. It follows the path from a user's request through registration, backend connections, and end-to-end execution.

In plain words
What is it for?
Use it to verify hooks, task runners, database connections, and other infrastructure by tracing and testing their real execution path.
Why use it?
Code can exist without ever being called, leaving a feature apparently complete but inactive. This check catches missing wiring and unused infrastructure.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter. Also seen: reads .claude/ paths.

Good fit Use it to verify hooks, task runners, database connections, and other infrastructure by tracing and testing their real execution path.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/vibeeval/vibecosystem/completion-check
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add vibeeval/vibecosystem --skill completion-check
Clone the repo
git clone --depth 1 https://github.com/vibeeval/vibecosystem

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for completion-check

README.md
[![agentmods](https://agentmods.dev/badge/skills/vibeeval/vibecosystem/completion-check.svg)](https://agentmods.dev/skills/vibeeval/vibecosystem/completion-check)
Your own site
<a href="https://agentmods.dev/skills/vibeeval/vibecosystem/completion-check"><img src="https://agentmods.dev/badge/skills/vibeeval/vibecosystem/completion-check.svg" alt="Measured on agentmods" height="20"></a>
Per session 10 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 693 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin 100% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00010 $0.00693
Opus 5 $0.00005 $0.00347
Sonnet 5 $0.00002 $0.00139
Haiku 4.5 $0.00001 $0.00069

Measured 4d ago against content hash 84e0daf53138, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade B, and why

completion-check scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

grep "my-hook" .claude/settings.json
Origin

This is a copy

100% identical to completion-check — 202 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/completion-check/SKILL.md · 102 lines

How it starts

The opening of the file, as written. The whole thing — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Completion Check: Verify Infrastructure Is Wired

When building infrastructure, verify it's actually connected to the system before marking as complete.

Pattern

Infrastructure is not done when the code is written - it's done when it's wired into the system and actively used. Dead code (built but never called) is wasted effort.

DO

  1. Trace the execution path - Follow from user intent to actual code execution:

    # Example: Verify Task tool spawns correctly
    grep -r "claude -p" src/
    grep -r "Task(" src/
    
  2. Check hooks are registered, not just implemented:

    # Hook exists?
    ls -la .claude/hooks/my-hook.sh
    
    # Hook registered in settings?
    grep "my-hook" .claude/settings.json
    
  3. Verify database connections - Ensure infrastructure uses the right backend:

    # Check connection strings
    grep -r "postgresql://" src/
    grep -r "sqlite:" src/  # Should NOT find if PostgreSQL expected
    
  4. Test end-to-end - Run the feature and verify infrastructure is invoked:

    # Add debug logging
    echo "DEBUG: DAG spawn invoked" >> /tmp/debug.log
    
    # Trigger feature
    uv run python -m my_feature
    
    # Verify infrastructure was called
    cat /tmp/debug.log
    
  5. Search for orphaned implementations:

    # Find functions defined but never called
    ast-grep --pattern 'async function $NAME() { $$$ }' | \
      xargs -I {} grep -r "{}" src/
    

DON'T

  • Mark infrastructure "complete" without testing execution path
  • Assume code is wired just because it exists
  • Build parallel systems (Task tool vs claude -p spawn)
  • Use wrong backends (SQLite when PostgreSQL is architected)
  • Skip end-to-end testing ("it compiles" ≠ "it runs")

Completion Checklist

Before declaring infrastructure complete:

  • Traced execution path from entry point to infrastructure
  • Verified hooks are registered in .claude/settings.json
  • Confirmed correct database/backend in use
  • Ran end-to-end test showing infrastructure invoked
  • Searched for dead code or parallel implementations
  • Checked configuration files match implementation

Read the full file on GitHub · 102 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 4d ago First seen · 102 lines · 10 tokens per session scan B 84e0daf53138

Subscribe to this mod's changes

completion-check is a skill published in the GitHub repository vibeeval/vibecosystem (530 stars, last pushed 1mo ago), licensed MIT. It adds 10 tokens to every session and 693 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). It is 100% identical to completion-check, differing in 202 lines, and is treated as a copy.