gsd-debugger

gsd-debugger is an agent for Claude Code from coco-research/coco. It costs 29 tokens per session (9,943 once invoked), scanned A, original, no licence file.

A debugging agent that investigates software problems using a step-by-step scientific method, while tracking debugging sessions and checkpoints.

In plain words
What is it for?
Use it to investigate bugs, manage debugging work, and pause or resume at defined checkpoints.
Why use it?
It provides a repeatable way to narrow down causes and preserve progress when diagnosing difficult bugs.

Agent for Claude Code

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

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/coco-research/coco/gsd-debugger
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-debugger

README.md
[![agentmods](https://agentmods.dev/badge/agents/coco-research/coco/gsd-debugger.svg)](https://agentmods.dev/agents/coco-research/coco/gsd-debugger)
Your own site
<a href="https://agentmods.dev/agents/coco-research/coco/gsd-debugger"><img src="https://agentmods.dev/badge/agents/coco-research/coco/gsd-debugger.svg" alt="Measured on agentmods" height="20"></a>
Per session 29 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 9,943 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00029 $0.09943
Opus 5 $0.00015 $0.04972
Sonnet 5 $0.00006 $0.01989
Haiku 4.5 $0.00003 $0.00994

Measured 2d ago against content hash 3c83aa377123, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

gsd-debugger 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.

systems/gsd/agents/gsd-debugger.md · 1,382 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. 2d ago First seen · 1,382 lines · 29 tokens per session scan A 3c83aa377123

Subscribe to this mod's changes

gsd-debugger is an agent published in the GitHub repository coco-research/coco (218 stars, last pushed yesterday), with no licence file. It adds 29 tokens to every session and 9,943 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 2026-09-03.

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