verification-before-completion

verification-before-completion is a skill for Claude Code from 0xmariowu/builders-dont-cry. It costs 54 tokens per session (527 once invoked), scanned A, original, MIT.

A rule that requires fresh verification before an agent says work is finished or ready to push. Verification means running a relevant check and reporting its command, exit code, and final output lines.

In plain words
What is it for?
Use it before reporting that a fix, build, or other coding task is complete outside an active execution loop.
Why use it?
It prevents completion claims based only on assumptions or earlier work. The required evidence makes it easier to see whether the claimed result was actually checked.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the builders-dont-cry plugin — 12 skills, 10 commands, 3 agents, 5 hooks shipped together

Good fit Use it before reporting that a fix, build, or other coding task is complete outside an active execution loop.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/0xmariowu/builders-dont-cry/verification-before-completion
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 0xmariowu/builders-dont-cry --skill verification-before-completion
Clone the repo
git clone --depth 1 https://github.com/0xmariowu/builders-dont-cry

Made for: Claude Code.

Or install builders-dont-cry, the plugin that ships this one along with the rest of its 12 skills, 10 commands, 3 agents, 5 hooks.

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/0xmariowu/builders-dont-cry/verification-before-completion/github.svg)](https://agentmods.dev/skills/0xmariowu/builders-dont-cry/verification-before-completion)
Your own site
<a href="https://agentmods.dev/skills/0xmariowu/builders-dont-cry/verification-before-completion"><img src="https://agentmods.dev/badge/skills/0xmariowu/builders-dont-cry/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/0xmariowu/builders-dont-cry/verification-before-completion"><img src="https://agentmods.dev/badge/skills/0xmariowu/builders-dont-cry/verification-before-completion.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 54 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 527 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 original 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 $0.00054 $0.00527
Opus 5 $0.00027 $0.00264
Sonnet 5 $0.00011 $0.00105
Haiku 4.5 $0.00005 $0.00053

Measured 10d ago against content hash 6e721dafdfa9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, 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 10d 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.

core/skills/verification-before-completion/SKILL.md · 61 lines

How it starts

The opening of the file, as written. The whole thing — 61 lines — stays where its author put it; the contents beside it link to each section on GitHub.

verification-before-completion

Do not claim completion without fresh verification evidence. Because: outside /execute, there is no step packet or checkbox gate to prove the work was actually checked.

Skip when already inside active /execute per-step execution. /execute has its own step packet, scope check, RED/GREEN evidence, verify, commit, and checkbox loop.

Trigger

Use this before saying:

  • DONE
  • 完成
  • ready to push
  • fixed
  • "it works"

Only trigger when the same response does not already contain fresh verify output.

Required action

  1. Identify the relevant verify command.
  2. Run it.
  3. Report:
    • command
    • exit code
    • last 5 lines
  4. Only then claim completion.

Evidence convention

For plan execution, prefer /execute evidence files. For freeform work, chat evidence is acceptable if it includes the command, exit code, and last 5 lines.

  • ${BDC_HOME:-$HOME/.bdc}/skills/execute/references/tdd-cycle.md § 6
  • ${BDC_HOME:-$HOME/.bdc}/skills/execute/SKILL.md

Verification

  • The final response includes command, exit code, and last 5 lines.
  • If no command can be identified, the response says verification could not be run instead of claiming done.

Red Flags

  • The response says "should work" or "fixed" without command output.
  • The only evidence is an earlier run from before the latest edit.
  • The task changed behavior but no test, lint, typecheck, or script self-test ran.

Common Rationalizations

Rationalization Response
"This was just docs/config, no verify needed." Advisory unless the file is behavior-rule config. Incident: standards/debugging.md 2026-04-26 records silent skip branches in BDC automation; behavior-rule files need executable checks when possible.
"The previous run passed." Do not claim done. Incident: standards/debugging.md 2026-04-01 says recursive automation looked alive while core actions were not actually running; fresh evidence must be current.

Read the full file on GitHub · 61 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. 10d ago First seen · 61 lines · 54 tokens per session scan A 6e721dafdfa9

Subscribe to this mod's changes

verification-before-completion is a skill published in the GitHub repository 0xmariowu/builders-dont-cry (4 stars, last pushed 4mo ago), licensed MIT. It adds 54 tokens to every session and 527 once invoked, about $0.0003 per session on Opus 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 2026-08-31.

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