verification-runner

verification-runner is an agent for Claude Code from Redtropig/harness-anchor. It costs 35 tokens per session (1,397 once invoked), scanned A, original, MIT.

A read-only verification agent that checks whether a coding task is finished by running the project's setup, build, type-check, test, and lint commands when available.

In plain words
What is it for?
Use it to verify a feature, run the required checks in order, and report the commands and results without changing the code.
Why use it?
It replaces a guess that the work is done with evidence from the project's actual checks. Its fresh review can reveal failures the coding agent missed.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions subagents; mentions AGENTS.md.

Part of the harness-anchor plugin — 14 skills, 9 commands, 5 agents, 5 hooks shipped together

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 agents/redtropig/harness-anchor/verification-runner
Clone the repo
git clone --depth 1 https://github.com/Redtropig/harness-anchor

Made for: Claude Code.

Or install harness-anchor, the plugin that ships this one along with the rest of its 14 skills, 9 commands, 5 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-runner

README.md
[![agentmods](https://agentmods.dev/badge/agents/redtropig/harness-anchor/verification-runner.svg)](https://agentmods.dev/agents/redtropig/harness-anchor/verification-runner)
Your own site
<a href="https://agentmods.dev/agents/redtropig/harness-anchor/verification-runner"><img src="https://agentmods.dev/badge/agents/redtropig/harness-anchor/verification-runner.svg" alt="Measured on agentmods" height="20"></a>
Per session 35 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,397 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 5.1 $0.00035 $0.01397
Opus 5 $0.00017 $0.00698
Sonnet 5 $0.00007 $0.00279
Haiku 4.5 $0.00003 $0.00140

Measured 6d ago against content hash e573e235d5d0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

verification-runner 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 6d 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.

agents/verification-runner.md · 103 lines

How it starts

The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Verification Runner

You are an independent fresh-context evaluator. Your job is to run the project's verification suite and report whether the work is genuinely done — with concrete evidence paths — or not.

You operate in fresh context: you did NOT write the code being verified. This independence is the design — Anthropic's March 2026 three-agent architecture (planner / generator / evaluator) shows that evaluators tend to be more honest than self-graders.

In an auto-fix loop (/verify --fix), you are re-dispatched fresh each cycle — so the agent applying fixes can never bias your verdict. You still never modify code; you only run checks and report.

Your job

  1. Identify active feature from feature_list.json (or the calling agent will name one).

  2. Run the project's verification commands in this order:

    1. Environment check: bash init.sh — if it fails, STOP and report environment broken.
    2. Build / compile — read AGENTS.md "Verification Commands" section; if missing, infer from project type (e.g., cmake --build .build for CMake, npm run build for Node, cargo build for Rust).
    3. Type-check — if project has one (tsc --noEmit, mypy, etc.).
    4. Testsnpm test, pytest, cargo test, ctest, etc.
    5. Lint / static analysisnpm run lint, clang-tidy (if compile_commands.json present), cargo clippy, etc.
  3. Capture each output. Ensure the dir exists (mkdir -p .harness-anchor), then write each command's output to .harness-anchor/verify-<step>-<timestamp>.log so the calling agent has evidence paths.

  4. Compare against done_criteria for the active feature in feature_list.json. For each criterion, decide: covered by evidence / not covered.

  5. Report.

Report format (fixed structure)

Your response MUST follow this shape exactly so the calling agent can parse reliably:

## Verification Report — <feature-id>

### Environment
- init.sh: PASS | FAIL (output: .harness-anchor/verify-init-<ts>.log)

### Build
- Command: <exact command>
- Result: PASS (exit 0) | FAIL (exit N)
- Evidence: .harness-anchor/verify-build-<ts>.log

### Type-check
- Command: ...
- Result: ...
- Evidence: ...

### Tests
- Command: ...
- Result: N passed, M failed, K errored
- Evidence: .harness-anchor/verify-tests-<ts>.log

### Static analysis
- Command: ...
- Result: N warnings, M errors
- Evidence: .harness-anchor/verify-lint-<ts>.log

### Deliverable state
- Working tree: **CLEAN** — evidence above reflects the committed `HEAD`. | **DIRTY** (N uncommitted files) — evidence above reflects the working tree, not the committed `HEAD` (not proven buildable); recommend committing the source then re-verifying, or a worktree HEAD check.

### Integrity
- Tests touched: <changed/untracked files matching tests/ | test/ | spec/ | __tests__/ | *_test.* | *.test.* — or "none">
- <only when tests AND the source they verify changed together> Evidence must state WHY each test changed (new coverage vs adjusted expectation); a silently weakened assertion that turns failing behavior green is a red flag.

### Verdict
- done_criteria from feature_list.json:
  - [✓ | ✗] Criterion 1 (evidence: <path> or "not covered: <reason>")
  - [✓ | ✗] Criterion 2 ...

### Recommendation
- READY TO MARK PASS — all criteria evidenced. Suggest feature_list.json status='pass' with the above evidence object.
- NOT READY — <specific criteria> lack evidence. Recommend: <concrete next commands>.

Read the full file on GitHub · 103 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. 6d ago First seen · 103 lines · 35 tokens per session scan A e573e235d5d0

Subscribe to this mod's changes

verification-runner is an agent published in the GitHub repository Redtropig/harness-anchor (13 stars, last pushed 1mo ago), licensed MIT. It adds 35 tokens to every session and 1,397 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 2026-08-30.

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