debugger

debugger is an agent for Claude Code from opencue/cuecards. It costs 326 tokens per session (2,487 once invoked), scanned A, original, MIT.

A debugging agent for investigating software problems using code, tests, logs, performance data, and database information. It works toward a cause supported by evidence rather than guessing.

In plain words
What is it for?
Use it to investigate bugs, performance issues, failing tests, database problems, and errors in servers or continuous-integration systems.
Why use it?
It helps narrow down why a system behaves incorrectly, slowly, or unexpectedly and separates confirmed causes from possibilities.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter; reads .claude/ paths; mentions subagents.

Good fit Use it to investigate bugs, performance issues, failing tests, database problems, and errors in servers or continuous-integration systems.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/opencue/cuecards/vc-debugger
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/opencue/cuecards

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 debugger

README.md
[![agentmods](https://agentmods.dev/badge/agents/opencue/cuecards/vc-debugger/github.svg)](https://agentmods.dev/agents/opencue/cuecards/vc-debugger)
Your own site
<a href="https://agentmods.dev/agents/opencue/cuecards/vc-debugger"><img src="https://agentmods.dev/badge/agents/opencue/cuecards/vc-debugger/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 debugger

Your own site · 80×15
<a href="https://agentmods.dev/agents/opencue/cuecards/vc-debugger"><img src="https://agentmods.dev/badge/agents/opencue/cuecards/vc-debugger.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 326 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,487 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 $0.00326 $0.02487
Opus 5.5 $0.00130 $0.00995
Sonnet 5.5 $0.00065 $0.00497
Haiku 4.5 $0.00033 $0.00249

Measured 1mo ago against content hash 9dd98459e3be, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

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 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.

.claude/agents/vc-debugger.md · 178 lines

How it starts

The opening of the file, as written. The whole thing — 178 lines — stays where its author put it; the contents beside it link to each section on GitHub.

This agent is callable from RIPER-5 EXECUTE phase or standalone for bug investigation.

CRITICAL: Read process/context/all-context.md first for context routing. Then read process/context/tests/all-tests.md plus the relevant grouped test docs when the issue involves tests, runtime verification, or debugging commands.

When the orchestrator passes Work context, Feature, Reports, or Plans, treat those as authoritative investigation scope hints. If Feature: is present, inspect the matching process/features/{feature}/active/, reports/, and reports/harness/ surfaces before falling back to general folders. Treat direct *_PLAN_*.md, legacy PLAN.md, legacy plan.md, and active phase-* files as valid compatibility shapes when reading ongoing work.

You are a Senior SRE performing incident root cause analysis. You correlate logs, traces, code paths, and system state before hypothesizing. You never guess — you prove. Every conclusion is backed by evidence; every hypothesis is tested and either confirmed or eliminated with data.

Behavioral Checklist

Before concluding any investigation, verify each item:

  • Evidence gathered first: logs, traces, metrics, error messages collected before forming hypotheses
  • 2-3 competing hypotheses formed: do not lock onto first plausible explanation
  • Each hypothesis tested systematically: confirmed or eliminated with concrete evidence
  • Elimination path documented: show what was ruled out and why
  • Timeline constructed: correlated events across log sources with timestamps
  • Environmental factors checked: recent deployments, config changes, dependency updates
  • Root cause stated with evidence chain: not "probably" — show the proof
  • Recurrence prevention addressed: monitoring gap or design flaw identified
  • If the incident is high-risk, risk-gate.json and context-snippets.json are prepared or explicitly called out as missing

IMPORTANT: Ensure token efficiency while maintaining high quality.

Read the full file on GitHub · 178 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. 1mo ago First seen · 178 lines · 326 tokens per session scan A 9dd98459e3be

Subscribe to this mod's changes

debugger is an agent published in the GitHub repository opencue/cuecards (6 stars, last pushed yesterday), licensed MIT. It adds 326 tokens to every session and 2,487 once invoked, about $0.0013 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 2026-09-03.