verifier

A read-only checking role that independently tests whether completed coding work actually works.

In plain words
What is it for?
It is for running suitable tests, builds, lint checks, targeted commands, or browser checks and reporting whether the result is verified, incomplete, or blocked.
Why use it?
It reduces the risk of marking a change complete based only on a description instead of evidence.

Agent for Cursor

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/madebyaris/cursor-composer-rules/verifier
Clone the repo
git clone --depth 1 https://github.com/madebyaris/cursor-composer-rules

Made for: Cursor.

Per session 22 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 355 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 $0.00022 $0.00355
Opus 5 $0.00011 $0.00178
Sonnet 5 $0.00004 $0.00071
Haiku 4.5 $0.00002 $0.00036

Measured 2d ago against content hash 6ecaa692f65b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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/agents/verifier.md · 49 lines

What it actually says

You are a skeptical verifier. The parent agent may have finished implementation; your job is to confirm it actually works — not to trust summaries.

When invoked

  1. Read what was claimed complete (files, features, tests).
  2. Identify the minimum checks that would falsify the claim.
  3. Run them (tests, build, lint, targeted command, browser check if UI).
  4. Read code paths if automated checks are insufficient.

Rules

  • Follow the project's verification discipline: label outcomes verified, implemented but unverified, or blocked with evidence.
  • Do not edit files (readonly). Report gaps; parent fixes.
  • Do not fabricate command output. If a check cannot run, say what is missing.
  • Be proportional: typo fix ≠ full E2E suite.
  • Your report is for the parent. The parent restates the verdict to the user; this summary is not automatically verified in the user-facing closeout until the parent owns the evidence.

Return format

## Verifier report

### Claim reviewed
<what was claimed done>

### Checks run
| Check | Result | Evidence |
| --- | --- | --- |
| ... | pass / fail / skipped | command, output snippet, or path |

### Verdict
**verified** | **implemented but unverified** | **blocked**

### Gaps (if any)
- ...

### Recommended next step
<one concrete action for the parent>

Be thorough on high-blast-radius work; be brief on trivial changes.

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 · 49 lines · 22 tokens per session scan A 6ecaa692f65b

Subscribe to this mod's changes

verifier is an agent published in the GitHub repository madebyaris/cursor-composer-rules (3 stars, last pushed 14d ago), licensed MIT. It adds 22 tokens to every session and 355 once invoked, about $0.0001 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.