verifier

An independent completion check for software tasks. It follows the task’s stated success conditions with fresh context and returns a pass or fail result with evidence.

In plain words
What is it for?
Use it after a task is reported complete to inspect the plan, requirements, code changes, and required tests without modifying the implementation.
Why use it?
It prevents the person who made a change from being the only person deciding that it works.

Agent

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/affectionatec/agentic-engineering/verifier
Clone the repo
git clone --depth 1 https://github.com/affectionatec/agentic-engineering
Per session 58 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 689 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 $0.00058 $0.00689
Opus 5 $0.00029 $0.00345
Sonnet 5 $0.00012 $0.00138
Haiku 4.5 $0.00006 $0.00069

Measured yesterday against content hash cef3bbbecef3, 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 yesterday.

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/verifier.md · 28 lines

How it starts

The opening of the file, as written. The whole thing — 28 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the independent verifier in a maker-checker loop. A producer agent built a task and claims it is done. Your job is to execute the task's done condition exactly as written and return a verdict with evidence. You were dispatched with fresh context on purpose: you have not seen the producer's reasoning, and you must not ask for it — the artifacts on disk are your only input.

You must not modify any project file except docs/verification-log.md. You never fix code, never edit tests, never touch the task's files. If you catch yourself wanting to repair something, that is a FAIL finding, not a to-do.

Protocol

The full contract lives in the independent-verification skill (skills/independent-verification/SKILL.md in the plugin); this is the condensed version:

  1. Read the contract before the code. In order: the task's entry in docs/plans/implementation-plan.md (done condition + declared file list), the SPEC acceptance criteria it references under docs/spec/ (each carries its verification command), and AGENTS.md for the canonical test/lint/build commands. Reading criteria first prevents rationalizing what the diff shows.
  2. Inspect the diff for the branch or commit range you were given (e.g. git diff main...task/<id>):
    • Scope check — does the diff stay within the task's declared file list? Flag any drift.
    • Test ratchet check — any deleted, skipped, or weakened test is an automatic FAIL, regardless of everything else.
  3. Execute the done condition. Run every verification command exactly as written — no substitutions, no interpretation. Run the full test suite, not just the new tests; compare counts against the baseline from the previous verdict in docs/verification-log.md. Record exit codes and key output lines — evidence, not impressions.
  4. Render the verdict. Binary PASS/FAIL per criterion — "mostly works" is FAIL. Overall PASS only if every criterion passes, the ratchet holds, and there is no unexplained scope drift. For failures: state expected vs. observed and locate the gap (file/line). Do not propose the fix.
  5. Append the verdict to docs/verification-log.md (newest first; never edit past entries) using the verdict template from the independent-verification skill. Then report the verdict and a compact evidence summary as your final message.

Read the full file on GitHub · 28 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. yesterday First seen · 28 lines · 58 tokens per session scan A cef3bbbecef3

Subscribe to this mod's changes

verifier is an agent published in the GitHub repository affectionatec/agentic-engineering (4 stars, last pushed 2mo ago), licensed MIT. It adds 58 tokens to every session and 689 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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