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89 lines
3 KiB
Markdown
89 lines
3 KiB
Markdown
---
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name: gitnexus-debugging
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description: "Use when the user is debugging a bug, tracing an error, or asking why something fails. Examples: \"Why is X failing?\", \"Where does this error come from?\", \"Trace this bug\""
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---
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# Debugging with GitNexus
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## When to Use
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- "Why is this function failing?"
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- "Trace where this error comes from"
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- "Who calls this method?"
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- "This endpoint returns 500"
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- Investigating bugs, errors, or unexpected behavior
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## Workflow
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```
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1. query({query: "<error or symptom>"}) → Find related execution flows
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2. context({name: "<suspect>"}) → See callers/callees/processes
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3. READ gitnexus://repo/{name}/process/{name} → Trace execution flow
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4. cypher({query: "MATCH path..."}) → Custom traces if needed
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```
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> If "Index is stale" → run `node .gitnexus/run.cjs analyze` in terminal.
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## Checklist
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```
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- [ ] Understand the symptom (error message, unexpected behavior)
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- [ ] query for error text or related code
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- [ ] Identify the suspect function from returned processes
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- [ ] context to see callers and callees
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- [ ] Trace execution flow via process resource if applicable
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- [ ] cypher for custom call chain traces if needed
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- [ ] Read source files to confirm root cause
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```
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## Debugging Patterns
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| Symptom | GitNexus Approach |
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| -------------------- | ---------------------------------------------------------- |
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| Error message | `query` for error text → `context` on throw sites |
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| Wrong return value | `context` on the function → trace callees for data flow |
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| Intermittent failure | `context` → look for external calls, async deps |
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| Performance issue | `context` → find symbols with many callers (hot paths) |
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| Recent regression | `detect_changes` to see what your changes affect |
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## Tools
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**query** — find code related to error:
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```
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query({query: "payment validation error"})
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→ Processes: CheckoutFlow, ErrorHandling
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→ Symbols: validatePayment, handlePaymentError, PaymentException
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```
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**context** — full context for a suspect:
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```
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context({name: "validatePayment"})
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→ Incoming calls: processCheckout, webhookHandler
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→ Outgoing calls: verifyCard, fetchRates (external API!)
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→ Processes: CheckoutFlow (step 3/7)
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```
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**cypher** — custom call chain traces:
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```cypher
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MATCH path = (a)-[:CodeRelation {type: 'CALLS'}*1..2]->(b:Function {name: "validatePayment"})
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RETURN [n IN nodes(path) | n.name] AS chain
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```
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## Example: "Payment endpoint returns 500 intermittently"
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```
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1. query({query: "payment error handling"})
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→ Processes: CheckoutFlow, ErrorHandling
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→ Symbols: validatePayment, handlePaymentError
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2. context({name: "validatePayment"})
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→ Outgoing calls: verifyCard, fetchRates (external API!)
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3. READ gitnexus://repo/my-app/process/CheckoutFlow
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→ Step 3: validatePayment → calls fetchRates (external)
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4. Root cause: fetchRates calls external API without proper timeout
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```
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