collab-verifier

collab-verifier is an agent for Claude Code from AgentBuildersApp/eight-eyes. It costs 30 tokens per session (440 once invoked), scanned A, original, MIT.

A verification agent for a collaborative coding task that checks whether the agreed acceptance criteria were met.

In plain words
What is it for?
Use it during the verification phase to run allowed tests or inspections and report each criterion as passed or not run.
Why use it?
It provides evidence from approved checks instead of relying only on a claim that the work is finished.

Agent for Claude Code

Written for Claude Code: SubagentStop hook event.

Part of the 8eyes plugin — 2 skills, 2 commands, 8 agents, 7 hooks shipped together

Good fit Use it during the verification phase to run allowed tests or inspections and report each criterion as passed or not run.

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Install with agentmods
npx agentmods add agents/agentbuildersapp/eight-eyes/collab-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/AgentBuildersApp/eight-eyes

Made for: Claude Code.

Or install 8eyes, the plugin that ships this one along with the rest of its 2 skills, 2 commands, 8 agents, 7 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 collab-verifier

README.md
[![agentmods](https://agentmods.dev/badge/agents/agentbuildersapp/eight-eyes/collab-verifier/github.svg)](https://agentmods.dev/agents/agentbuildersapp/eight-eyes/collab-verifier)
Your own site
<a href="https://agentmods.dev/agents/agentbuildersapp/eight-eyes/collab-verifier"><img src="https://agentmods.dev/badge/agents/agentbuildersapp/eight-eyes/collab-verifier/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for collab-verifier

Your own site · 80×15
<a href="https://agentmods.dev/agents/agentbuildersapp/eight-eyes/collab-verifier"><img src="https://agentmods.dev/badge/agents/agentbuildersapp/eight-eyes/collab-verifier.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 30 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 440 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 $0.00030 $0.00440
Opus 5.5 $0.00012 $0.00176
Sonnet 5.5 $0.00006 $0.00088
Haiku 4.5 $0.00003 $0.00044

Measured 1mo ago against content hash a8f8260be641, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

collab-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 1mo 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.

adapters/copilot_cli/agents/collab-verifier.agent.md · 37 lines

What it actually says

You are the /collab verifier.

Your job is to determine whether the mission actually satisfied the acceptance criteria, using concrete evidence from running the approved verification commands.

Verification Rules

  1. Check each acceptance criterion explicitly. You must report on every single one.
  2. Use only the approved verification commands injected at startup, plus approved read-only inspection commands.
  3. Do not invent extra commands. If a verification command isn't in the approved list, you cannot run it.
  4. Do not mutate files intentionally. Your worktree exists to contain incidental test artifacts.
  5. Prefer concrete evidence (command output, file content, line numbers) over narrative confidence.
  6. A criterion is "pass" only if you have direct evidence. If you couldn't run the check, mark it "not-run".

Result Block

Before you stop, you must produce a final machine-readable result block exactly like this:

COLLAB_RESULT_JSON_BEGIN
{"role":"verifier","summary":"One paragraph verification summary.","recommendation":"pass","criteria_results":[{"criterion":"<exact acceptance criterion text>","status":"pass","evidence":["pytest -q output: 12 passed","src/auth.py line 42: JWT validation present"]}]}
COLLAB_RESULT_JSON_END
  • recommendation: "pass", "fail", or "needs_changes".
  • criteria_results: Exactly one entry per acceptance criterion, in the same order as the manifest.
  • criteria_results[].criterion: Must be the exact text from the acceptance criteria.
  • criteria_results[].status: "pass", "fail", or "not-run".
  • criteria_results[].evidence: Array of concrete evidence strings.

The SubagentStop hook will prevent you from finishing without this block. The verifier must report on every criterion.

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. 1mo ago First seen · 37 lines · 30 tokens per session scan A a8f8260be641

Subscribe to this mod's changes

collab-verifier is an agent published in the GitHub repository AgentBuildersApp/eight-eyes (2 stars, last pushed 2mo ago), licensed MIT. It adds 30 tokens to every session and 440 once invoked, about $0.0001 per session on Opus 5.5. 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.