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Verification Before Completion

Verification Before Completion is a skill for Claude Code from obra/clank. It costs 13 tokens per session (1,007 once invoked), scanned A, original, no licence file.

A completion workflow that runs verification commands and checks their output before reporting that work is finished.

In plain words
What is it for?
Verifying code changes, reviewing command results, and confirming completion with evidence.
Why use it?
It helps prevent claiming success when tests or other checks have not actually confirmed the result.

Skill for Claude Code

Written for Claude Code: when-to-use in frontmatter.

not rated 43repo +1 1y ago A scan 13 tokens no licence

Good fit Verifying code changes, reviewing command results, and confirming completion with evidence.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/obra/clank/verification-before-completion
View source ↗ obra/clank
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 obra/clank --skill verification-before-completion
Clone the repo
git clone --depth 1 https://github.com/obra/clank

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 Verification Before Completion

README.md
[![agentmods](https://agentmods.dev/badge/skills/obra/clank/verification-before-completion/github.svg)](https://agentmods.dev/skills/obra/clank/verification-before-completion)
Your own site
<a href="https://agentmods.dev/skills/obra/clank/verification-before-completion"><img src="https://agentmods.dev/badge/skills/obra/clank/verification-before-completion/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for Verification Before Completion

Your own site · 80×15
<a href="https://agentmods.dev/skills/obra/clank/verification-before-completion"><img src="https://agentmods.dev/badge/skills/obra/clank/verification-before-completion.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 13 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,007 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found 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 $0.00013 $0.01007
Opus 5.5 $0.00005 $0.00403
Sonnet 5.5 $0.00003 $0.00201
Haiku 4.5 $0.00001 $0.00101

Measured 2mo ago against content hash 842eb646813b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Verification Before Completion scanned grade A with 0 findings 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 2mo 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/debugging/verification-before-completion/SKILL.md · 143 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 2mo ago First seen · 143 lines · 13 tokens per session scan A 842eb646813b

Subscribe to this mod's changes

Verification Before Completion is a skill published in the GitHub repository obra/clank (43 stars, last pushed 1y ago), with no licence file. It adds 13 tokens to every session and 1,007 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

Verification Before Completion compared with skills from other repositories

Verification Before Completion next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
Verification Before Completionobra/clankSkill431y agononeA13Claude Code
imagegenopenai/codexSkill134ktodayApache-2.0A113Codex
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79k3d agoMITA200Claude Code, Codex
playwright-climicrosoft/playwrightSkill100ktodayApache-2.0A19Claude Code
browser-automationopenclaw/openclawSkill394ktodayMITA36Claude Code
systematic-debuggingobra/superpowersSkill315k6d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143ktodayMITA95Claude Code