call-chain
Traces execution paths through the code graph with criticality scoring and Mermaid charts. Use when understanding how a function propagates through the system.
What this skill does
# Call Chain Tracing
Trace execution flows through the codebase using the
code knowledge graph.
## Prerequisites
This skill requires the **gauntlet** plugin for graph
data. Discover it:
```bash
GRAPH_QUERY=$(find ~/.claude/plugins -name "graph_query.py" -path "*/gauntlet/*" 2>/dev/null | head -1)
```
**If gauntlet is not installed**: Fall back to static
analysis. Use `grep` to trace function calls and build
a Mermaid diagram manually from import/call patterns.
Skip graph-specific steps.
**If installed but no graph.db**: Tell the user to run
`/gauntlet-graph build`.
## Steps
1. **Accept target**: Get a function name or entry point
from the user (or trace all entry points).
2. **Run flow tracing** (requires gauntlet):
```bash
python3 "$GRAPH_QUERY" --action flows --depth 15
```
To filter by entry point:
```bash
python3 "$GRAPH_QUERY" --action flows --entry "main"
```
**Fallback (no gauntlet)**: Trace calls with rg (or grep):
```bash
# Prefer rg (ripgrep) for speed; fall back to grep
if command -v rg &>/dev/null; then
rg -n "function_name\(" --type py . | head -20
else
grep -rn "function_name(" --include="*.py" . | head -20
fi
```
Build the call tree manually from search results.
3. **Display as indented tree**:
```
main() [criticality: 0.72]
-> validate_input()
-> parse_config()
-> process_data()
-> db.execute_query()
-> cache.store()
-> send_response()
```
4. **Generate Mermaid flowchart**:
```mermaid
flowchart LR
main --> validate_input
main --> process_data
main --> send_response
validate_input --> parse_config
process_data --> db.execute_query
process_data --> cache.store
```
5. **Show criticality breakdown**:
- File spread: how many files the flow touches
- Security sensitivity: auth/crypto code in the path
- Test coverage gaps: untested nodes in the flow
## Criticality Scoring
| Factor | Weight | Meaning |
|--------|--------|---------|
| File spread | 0.30 | Touches many files |
| Security | 0.25 | Contains auth/crypto code |
| External calls | 0.20 | Unresolved dependencies |
| Test gap | 0.15 | Untested nodes in flow |
| Depth | 0.10 | Deep call chains |
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