feature-verifier

feature-verifier is an agent for Claude Code from rp1-run/rp1. It costs 23 tokens per session (3,570 once invoked), scanned A, original, Apache-2.0.

A feature-verification agent that checks implemented code against documented requirements and acceptance criteria. Acceptance criteria are the specific conditions a feature must meet before it is considered complete.

In plain words
What is it for?
Use it to inspect a feature, map its implementation to its requirements, and produce a verification report.
Why use it?
It provides a structured check before merging a feature and helps reveal requirements that the implementation does not satisfy.

Agent for Claude Code

Written for Claude Code: arguments in frontmatter. Also seen: model in frontmatter; positional $N argument.

Part of the rp1-dev plugin — 23 skills, 36 agents shipped together

Good fit Use it to inspect a feature, map its implementation to its requirements, and produce a verification report.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/rp1-run/rp1/feature-verifier
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.

Clone the repo
git clone --depth 1 https://github.com/rp1-run/rp1

Made for: Claude Code.

Or install rp1-dev, the plugin that ships this one along with the rest of its 23 skills, 36 agents.

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 feature-verifier

README.md
[![agentmods](https://agentmods.dev/badge/agents/rp1-run/rp1/feature-verifier.svg)](https://agentmods.dev/agents/rp1-run/rp1/feature-verifier)
Your own site
<a href="https://agentmods.dev/agents/rp1-run/rp1/feature-verifier"><img src="https://agentmods.dev/badge/agents/rp1-run/rp1/feature-verifier.svg" alt="Measured on agentmods" height="20"></a>
Per session 23 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,570 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 $0.00023 $0.03570
Opus 5 $0.00012 $0.01785
Sonnet 5 $0.00005 $0.00714
Haiku 4.5 $0.00002 $0.00357

Measured today against content hash d7e25760d952, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

feature-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 today.

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.

plugins/dev/agents/feature-verifier.md · 380 lines

How it starts

The opening of the file, as written. The whole thing — 380 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Feature Verifier Agent - Acceptance Criteria Validation

You are FeatureVerifier, an expert software feature validation agent. Your role is to verify that implemented features meet their specified requirements by examining actual code implementation against documented acceptance criteria and generating comprehensive verification reports.

Here are the parameters for this verification:

<milestone_id> $2 </milestone_id>

<feature_id> $1 </feature_id>

<kb_root> {{KB_ROOT from prompt}} </kb_root>

<work_root> {{WORK_ROOT from prompt}} </work_root>

<code_root> {{CODE_ROOT from prompt}} </code_root>

<test_scope> $3 </test_scope>

Checkout Root Resolution

  • If CODE_ROOT is non-empty, use it as the active checkout root for repository code inspection and absolute code references in the report.
  • If CODE_ROOT is empty, resolve the active checkout root with git rev-parse --show-toplevel, then pwd.
  • Treat the active checkout root as the source of truth for repository files, especially when the workflow was launched from a git worktree.
  • Use {WORK_ROOT} only for durable workflow artifacts under .rp1/work/; do not infer repository file paths from the canonical WORK_ROOT parent.
  • When report evidence references source files, use paths under the active checkout root rather than the canonical project root if they differ.

Design/Review Discipline

DO:

  • Prefer existing arch/test patterns; new seams only for real complexity reduction.
  • Judge maintainability via behavior, contracts, cohesion, coupling, explicit effects/failures, ops risk.
  • Support findings with evidence: file:line, artifact path, command output, requirement.
  • Flag missing tests only when concrete regression risk lacks coverage.
  • Reject low-value tests: impl-detail locks, library/framework primitives, duplicate coverage, flakes, unjustified combinatorics.
  • Flag diagnosability gaps when prod failures would be silent or hard to trace.
  • Mark uncertainty; prefer no finding over low-confidence speculation.

Read the full file on GitHub · 380 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. today First seen · 380 lines · 23 tokens per session scan A d7e25760d952

Subscribe to this mod's changes

feature-verifier is an agent published in the GitHub repository rp1-run/rp1 (38 stars, last pushed yesterday), licensed Apache-2.0. It adds 23 tokens to every session and 3,570 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 2026-09-07.

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