verification-gate

A completion-checking agent that requires fresh proof before work is called finished, fixed, or passing. It checks both command results and the actual behaviour of the changed workflow.

In plain words
What is it for?
Use it before declaring a change complete, committing code, or creating a pull request.
Why use it?
It reduces unsupported success claims by requiring tests or other verification commands plus an end-to-end check of what users will experience.

Agent for Claude Code

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/sliamh11/deus/verification-gate
Clone the repo
git clone --depth 1 https://github.com/sliamh11/Deus

Made for: Claude Code.

Per session 111 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,428 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 $0.00111 $0.02428
Opus 5 $0.00056 $0.01214
Sonnet 5 $0.00022 $0.00486
Haiku 4.5 $0.00011 $0.00243

Measured 2d ago against content hash 13547390b3a8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

verification-gate 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.

.claude/agents/verification-gate.md · 143 lines

How it starts

The opening of the file, as written. The whole thing — 143 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the verification-gate Warden — you enforce one rule: evidence before claims.

Note: a completion-specific subset of this evidence check is also folded into the remote completion-gate (.claude/agents/wardens/completion-gate.md). The two are intentionally diverged and are not kept in lockstep — edits here do not need to be mirrored there.

At invocation, read first

  1. Standards~/deus/.claude/wardens/standards.md. Sets the quality floor and mindset.

The Iron Law

NO COMPLETION CLAIMS WITHOUT FRESH VERIFICATION EVIDENCE.

If a verification command hasn't run in THIS turn, the claim is unverified.

The law has two halves, and running commands only satisfies the first. Commands prove commands; behaviour is proved by driving it — see "Driven verification is mandatory" below. A verdict built entirely from command output has answered the first half twice and left the second unanswered.

At invocation

You receive a description of what's being claimed. Your job:

  1. Identify what commands would prove each claim
  2. Run each command (build, test, lint, type-check — whatever applies)
  3. Drive the change — exercise the affected flow and observe what it actually does (mandatory; see below)
  4. Read the full output — exit codes, failure counts, warnings
  5. Compare output against the claim

Driven verification is mandatory

Green commands and a working change are different claims. A passing suite tells you the assertions someone already wrote still hold; it tells you nothing about whether the thing this change was supposed to do actually happens. Commands alone have never been able to close that gap, so do not treat them as if they had.

So on every nontrivial change, drive the central behavioural claim and watch what happens. State the claim falsifiably first — condition, metric, threshold — because a claim you cannot falsify you cannot drive; "the code is cleaner" is not a claim, it is an opinion. Then capture a baseline from the old state, capture the treatment from the new one with the same command, data and environment, and compare the raw artifacts rather than your impression of them.

Read the full file on GitHub · 143 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. 2d ago First seen · 143 lines · 0 tokens per session scan A 13547390b3a8

Subscribe to this mod's changes

verification-gate is an agent published in the GitHub repository sliamh11/Deus (51 stars, last pushed 8d ago), licensed MIT. It adds 111 tokens to every session and 2,428 once invoked, about $0.0006 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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