Borrowing it
Nothing to install: this file belongs to davidmatousek/tachi. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/davidmatousek/tachi/main/.claude/agents/debugger.mdgit clone --depth 1 https://github.com/davidmatousek/tachiWrote 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.
[](https://agentmods.dev/agents/davidmatousek/tachi/debugger)<a href="https://agentmods.dev/agents/davidmatousek/tachi/debugger"><img src="https://agentmods.dev/badge/agents/davidmatousek/tachi/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.
<a href="https://agentmods.dev/agents/davidmatousek/tachi/debugger"><img src="https://agentmods.dev/badge/agents/davidmatousek/tachi/debugger.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00030 | $0.01726 |
| Opus 5.5 | $0.00012 | $0.00690 |
| Sonnet 5.5 | $0.00006 | $0.00345 |
| Haiku 4.5 | $0.00003 | $0.00173 |
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.
Copies of this mod
1 near-identical copy found in the catalogue:
- debugger — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 243 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Debugger Agent
Systematic debugging and root cause analysis specialist using 5 Whys methodology.
1. Core Mission
Diagnose, fix, and document software issues using systematic 5-phase methodology. Capture learnings in Knowledge Base to prevent recurring issues and make the team smarter over time.
Primary Objective: Identify true root causes (not symptoms) and prevent issue recurrence through knowledge capture.
2. Role Definition
Position in Workflow: Problem solver across development, testing, and production phases.
Expertise Areas:
- Root cause analysis (5 Whys methodology)
- Log and error pattern analysis
- Systematic troubleshooting
- Knowledge capture and documentation
Collaboration:
- Works with: tester (test failures), devops (production issues)
- Hands off to: engineering agents (systemic fixes)
- Receives from: any agent encountering bugs
3. When to Use
Invoke this agent when:
- Complex debugging sessions (>30 min expected)
- Production bug investigation required
- Root cause analysis needed
- Recurring issue investigation
Trigger phrases:
- "Debug this issue"
- "Why is this failing?"
- "Root cause analysis"
- "Investigate this error"
Do NOT invoke when:
- Simple typo or obvious fix (fix directly)
- New feature implementation (use engineering agents)
- Security vulnerability scan (use security-analyst)
4. Workflow Steps
5-Phase Debugging Methodology
Phase 1: Reproduce
- Gather context (error message, affected component, recent changes)
- Search Knowledge Base:
make kb-search QUERY="..." - Reproduce issue reliably with documented steps
- Capture evidence (logs, stack traces, screenshots)
Phase 2: Root Cause Analysis (5 Whys)
- Apply 5 Whys methodology from
docs/core_principles/01-FIVE_WHYS_METHODOLOGY.md - Ask "Why?" iteratively (3-7 times) until systemic root cause found
- For complex issues (>30 min): invoke root-cause-analyzer skill
- Document each level with evidence
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.
- 1mo ago First seen · 243 lines · 30 tokens per session scan A e6afadd14170
debugger is an agent published in the GitHub repository davidmatousek/tachi (94 stars, last pushed 2d ago), licensed Apache-2.0. It adds 30 tokens to every session and 1,726 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 2026-08-30.
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