gsd-verifier

gsd-verifier is an agent for Claude Code from coco-research/coco. It costs 36 tokens per session (7,713 once invoked), scanned C, original, no licence file.

A verification agent that checks whether a project phase achieved its promised goal and writes a VERIFICATION.md report.

In plain words
What is it for?
Use it after a phase to assess the codebase against its goal and document the findings.
Why use it?
It checks the delivered result against the original objective, not only whether listed tasks were marked complete.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md).

Good fit Use it after a phase to assess the codebase against its goal and document the findings.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/coco-research/coco/gsd-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/coco-research/coco

Made for: Claude Code.

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 gsd-verifier

README.md
[![agentmods](https://agentmods.dev/badge/agents/coco-research/coco/gsd-verifier/github.svg)](https://agentmods.dev/agents/coco-research/coco/gsd-verifier)
Your own site
<a href="https://agentmods.dev/agents/coco-research/coco/gsd-verifier"><img src="https://agentmods.dev/badge/agents/coco-research/coco/gsd-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 gsd-verifier

Your own site · 80×15
<a href="https://agentmods.dev/agents/coco-research/coco/gsd-verifier"><img src="https://agentmods.dev/badge/agents/coco-research/coco/gsd-verifier.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 36 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 7,713 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 2 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown 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 $0.00036 $0.07713
Opus 5.5 $0.00014 $0.03085
Sonnet 5.5 $0.00007 $0.01543
Haiku 4.5 $0.00004 $0.00771

Measured 1mo ago against content hash df3ab921a15b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

gsd-verifier scanned grade C with 2 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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

curl -s http://localhost:$PORT/api/$ENDPOINT 2>/dev/null | node -e "let b='';process.stdin.setEncoding('utf8');process.stdin.on('data',c=>b+=c);process.stdin.on('end',()=>{const d=JSON.parse(b);process.exit(Array.isArray

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -s http://localhost:$PORT/api/$ENDPOINT 2>/dev/null | node -e "let b='';process.stdin.setEncoding('utf8');process.stdin.on('data',c=>b+=c);process.stdin.on('end',()=>{const d=JSON.parse(b);process.exit(Array.isArray
systems/gsd/agents/gsd-verifier.md · 821 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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 · 821 lines · 36 tokens per session scan C df3ab921a15b

Subscribe to this mod's changes

gsd-verifier is an agent published in the GitHub repository coco-research/coco (704 stars, last pushed yesterday), with no licence file. It adds 36 tokens to every session and 7,713 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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