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.
npx skills add legacybridge-tech/claude-plugins --skill build-verify-loopgit clone --depth 1 https://github.com/legacybridge-tech/claude-pluginsWrote 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.
[](https://agentmods.dev/skills/legacybridge-tech/claude-plugins/build-verify-loop)<a href="https://agentmods.dev/skills/legacybridge-tech/claude-plugins/build-verify-loop"><img src="https://agentmods.dev/badge/skills/legacybridge-tech/claude-plugins/build-verify-loop/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.
<a href="https://agentmods.dev/skills/legacybridge-tech/claude-plugins/build-verify-loop"><img src="https://agentmods.dev/badge/skills/legacybridge-tech/claude-plugins/build-verify-loop.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00094 | $0.05991 |
| Opus 5.5 | $0.00038 | $0.02396 |
| Sonnet 5.5 | $0.00019 | $0.01198 |
| Haiku 4.5 | $0.00009 | $0.00599 |
Grade A, and why
build-verify-loop 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.
How it starts
The opening of the file, as written. The whole thing — 461 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Build-Verify Loop
A standalone Claude Code skill. Drop this directory into ~/.claude/skills/build-verify-loop/ and trigger with /build-verify-loop <task>. No additional configuration required.
What this is
An orchestration pattern for autonomous work. The main agent does not do the work itself — it spawns two isolated subagents per round:
- Implementor — produces / revises the artifact, addressing prior findings
- Critic — adversarial audit against acceptance criteria
The loop continues until the Critic finds nothing material for two consecutive rounds, or an exit condition forces escalation. The main agent never judges the content of individual findings, never paraphrases between subagents, and never injects its own framing — this is the discipline that makes the loop work.
When to use
Trigger phrases:
/build-verify-loop <task>or/bvl <task>- "Run a build-verify loop on X" / "Use bvl on X" / "Run bvl for Y"
- "Autonomously complete X with self-verification"
- "Self-iterate Y until done"
- 「自主完成 X」「閉環跑 Y」「自己跑迴圈做 Z」「用 bvl 跑 X」「啟動 bvl 做 Y」「使用 bvl skill 做 X」
Good fits:
- Producing or revising a non-trivial artifact (code module, document section, design doc, plan, proposal, spec)
- The user has acceptance criteria they can articulate up front
- The user wants the work done without per-round confirmation, but with rigor preserved
When NOT to use
- Single-shot tasks (no iteration needed)
- Open-ended exploration where AC cannot be defined
- Real-time conversational tasks
- Tasks where the user wants to be involved in every round
- Tasks requiring external side effects (deploy, send email, post to chat) — this skill is for artifact production only
Required inputs
When triggered, ensure the following are provided. If any are missing, ask in one batched message before starting the loop:
- TASK — one-line goal statement
- ARTIFACT — file path(s) the Implementor will read and write each round
- ACCEPTANCE CRITERIA (AC) — bullet list defining "done". Examples by domain:
- Code: tests must pass, no hardcoded credentials, function signature matches
foo(x: int) -> str - Document: covers sections A/B/C, audience is non-technical executives, under 800 words, tone formal
- Plan: includes pre-conditions, rollback, owner per phase, risk register
- Code: tests must pass, no hardcoded credentials, function signature matches
- DOMAIN CONTEXT (optional but recommended) — short paragraph orienting subagents to the work
- ITERATION_CAP (optional, default 5) — max rounds before forced escalation
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.
- 2mo ago First seen · 461 lines · 94 tokens per session scan A c22667fa0a16
build-verify-loop is a skill published in the GitHub repository legacybridge-tech/claude-plugins (6 stars, last pushed 5mo ago), licensed MIT. It adds 94 tokens to every session and 5,991 once invoked, about $0.0004 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 2026-08-31.
build-verify-loop compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| build-verify-looplegacybridge-tech/claude-plugins | Skill | 6 | 5mo ago | MIT | A | 94 | Claude Code |
| imagegenopenai/codex | Skill | 135k | today | Apache-2.0 | A | 113 | Codex |
| playwright-climicrosoft/playwright | Skill | 100k | today | Apache-2.0 | A | 19 | Claude Code |
| browser-automationopenclaw/openclaw | Skill | 394k | today | MIT | A | 36 | Claude Code |
| local-ai-agentsmicrosoft/ai-agents-for-beginners | Skill | 79k | 4d ago | MIT | A | 200 | Claude Code, Codex |
| systematic-debuggingobra/superpowers | Skill | 316k | 7d ago | MIT | A | 21 | Claude Code |
| next-cache-components-adoptionvercel/next.js | Skill | 143k | today | MIT | A | 95 | Claude Code |