gitnexus-debugging

A debugging guide that uses GitNexus to trace errors through a codebase. GitNexus maps relationships between functions, callers, and execution flows.

In plain words
What is it for?
Use it to investigate error messages, failing functions, unexpected behavior, broken endpoints, and caller-callee relationships.
Why use it?
It helps explain why something fails and find the code path behind an error instead of searching files manually.

Skill for Claude CodeCodex

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 skills/ucsandman/dashclaw/gitnexus-debugging
Any agent
npx skills add ucsandman/DashClaw --skill gitnexus-debugging
Clone the repo
git clone --depth 1 https://github.com/ucsandman/DashClaw

Made for: Claude Code, Codex.

Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 870 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod 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 $0.00046 $0.00870
Opus 5 $0.00023 $0.00435
Sonnet 5 $0.00009 $0.00174
Haiku 4.5 $0.00005 $0.00087

Measured 2d ago against content hash d8090c85e2c8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

gitnexus-debugging 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.

Origin

This is a copy

100% identical to gitnexus-debugging — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/skills/gitnexus/gitnexus-debugging/SKILL.md · 102 lines

How it starts

The opening of the file, as written. The whole thing — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Debugging with GitNexus

When to Use

  • "Why is this function failing?"
  • "Trace where this error comes from"
  • "Who calls this method?"
  • "This endpoint returns 500"
  • Investigating bugs, errors, or unexpected behavior

Workflow

1. query({search_query: "<error or symptom>"})            → Find related execution flows
2. context({name: "<suspect>"})                    → See callers/callees/processes
3. READ gitnexus://repo/{name}/process/{name}                → Trace execution flow
4. cypher({statement: "MATCH path..."})                 → Custom traces if needed

If "Index is stale" → run node .gitnexus/run.cjs analyze in terminal.

Checklist

- [ ] Understand the symptom (error message, unexpected behavior)
- [ ] query for error text or related code
- [ ] Identify the suspect function from returned processes
- [ ] context to see callers and callees
- [ ] Trace execution flow via process resource if applicable
- [ ] cypher for custom call chain traces if needed
- [ ] Read source files to confirm root cause

Debugging Patterns

Symptom GitNexus Approach
Error message query for error text → context on throw sites
Wrong return value context on the function → trace callees for data flow
Intermittent failure context → look for external calls, async deps
Performance issue context → find symbols with many callers (hot paths)
Recent regression detect_changes to see what your changes affect
"How does A reach B?" trace between the two symbols — shortest call chain in one call

Tools

query — find code related to error:

query({search_query: "payment validation error"})
→ Processes: CheckoutFlow, ErrorHandling
→ Symbols: validatePayment, handlePaymentError, PaymentException

context — full context for a suspect:

Read the full file on GitHub · 102 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. 2d ago First seen · 102 lines · 46 tokens per session scan A d8090c85e2c8

Subscribe to this mod's changes

gitnexus-debugging is a skill published in the GitHub repository ucsandman/DashClaw (296 stars, last pushed 4d ago), licensed MIT. It adds 46 tokens to every session and 870 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to gitnexus-debugging, differing in 0 lines, and is treated as a copy.

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