loop-verifier

A verification procedure for an agentic software-development loop after a human approves implementation. It builds a Gradle project, checks JaCoCo test coverage, checks coverage for changed lines, and reviews tests against a test matrix.

In plain words
What is it for?
Use it after Phase 3 approval to run the build and coverage checks, review end-to-end tests when available, and recommend which phase to revisit if checks fail.
Why use it?
It provides an independent check of a code change and helps identify whether failures come from tests, the local build, or architecture. The checker must use a different model or persona from the implementer.

Skill for Claude CodeCodexCursor

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.

agentmods
npx agentmods add skills/pallerana/agentic-loop-engineering-kit/loop-verifier
Any agent
npx skills add pallerana/agentic-loop-engineering-kit --skill loop-verifier
Clone the repo
git clone --depth 1 https://github.com/pallerana/agentic-loop-engineering-kit

Made for: Claude Code, Codex, Cursor.

Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 353 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00043 $0.00353
Opus 5 $0.00022 $0.00177
Sonnet 5 $0.00009 $0.00071
Haiku 4.5 $0.00004 $0.00035

Measured 2d ago against content hash 4eb0665a4d65, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

loop-verifier 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 2d 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.

.cursor/skills/loop-verifier/SKILL.md · 46 lines

What it actually says

Loop Verifier

Maker/checker verify pass for Agentic Loop Engineering Kit Phase 4.

Runbook: .cursor/skills/agentic-loop/SKILL.md Phase 4.

Hard rules

  • Run only after human approves Phase 3 implementation
  • Different model/persona than implementer for the same diff
  • Present results in Plan mode; do not auto-re-dispatch Failure Router

Verify steps

From profile repo (or --repo):

.cursor/skills/agentic-loop/scripts/gradle-build.sh <repo-path>
.cursor/skills/agentic-loop/scripts/parse-jacoco.sh <repo-path> <jacoco_line_ratio>
  • Profile E2E script if defined
  • Delta coverage: changed production lines need tests
  • ce-testing-reviewer against Phase 1 test matrix

On failure

Classify per GATES.md Failure Router — recommend restart phase, wait for human:

Signal Recommend
JaCoCo / delta Phase 4 test-repair → 3
Local build fail Phase 3
2+ arch failures Phase 1

Agent form

Optional dedicated agent: .cursor/agents/loop-verifier.md

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. 2d ago First seen · 46 lines · 43 tokens per session scan A 4eb0665a4d65

Subscribe to this mod's changes

loop-verifier is a skill published in the GitHub repository pallerana/agentic-loop-engineering-kit (4 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 43 tokens to every session and 353 once invoked, about $0.0002 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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