Debugging with OntoIndex

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. ontoindex_query({query: "<error or symptom>"})            → Find related execution flows
2. ontoindex_context({name: "<suspect>"})                    → See callers/callees/processes
3. READ ontoindex://repo/{name}/process/{name}                → Trace execution flow
4. ontoindex_cypher({query: "MATCH path..."})                 → Custom traces if needed

If "Index is stale" → run npx ontoindex analyze in terminal.

Checklist

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

Debugging Patterns

Symptom	OntoIndex Approach
Error message	ontoindex_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

Tools

ontoindex_query — find code related to error:

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

ontoindex_context — full context for a suspect:

ontoindex_context({name: "validatePayment"})
→ Incoming calls: processCheckout, webhookHandler
→ Outgoing calls: verifyCard, fetchRates (external API!)
→ Processes: CheckoutFlow (step 3/7)

ontoindex_cypher — custom call chain traces:

MATCH path = (a)-[:CodeRelation {type: 'CALLS'}*1..2]->(b:Function {name: "validatePayment"})
RETURN [n IN nodes(path) | n.name] AS chain

Example: "Payment endpoint returns 500 intermittently"

1. ontoindex_query({query: "payment error handling"})
   → Processes: CheckoutFlow, ErrorHandling
   → Symbols: validatePayment, handlePaymentError

2. ontoindex_context({name: "validatePayment"})
   → Outgoing calls: verifyCard, fetchRates (external API!)

3. READ ontoindex://repo/my-app/process/CheckoutFlow
   → Step 3: validatePayment → calls fetchRates (external)

4. Root cause: fetchRates calls external API without proper timeout