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Trace Elixir call trees from entry points via mix xref.
Passed 15 of 19 test cases with the skill, and 10 of 19 without it.
and 2 more in the full report
5 fixed12 passed either way5 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.
When executing subagent call tracing for `MyApp.Warehouse.fulfill/2`, `CLAUDE_CODE_MAX_SUBAGENT_SPAWN_DEPTH` is unset and `claude --version` reports version 2.1.219. What default depth applies?
| Checked | Without skill | With skill |
|---|---|---|
| Applies a default max depth of 3. | Missed | Passed |
The instructions your model reads when the skill loads.
Build call trees showing how functions are reached from entry points.
mix xref callers first - It's authoritative; grep is fallback only| Condition | Why Call Tree Helps |
|---|---|
| Unexpected nil/value at runtime | Trace where the value originates |
| Bug can't reproduce locally | See all entry points that reach the code |
| Changing function signature | Find all callers and their argument patterns |
| Incomplete stack trace | Get full path context |
| "Where does X come from?" | Visual answer to data flow question |
Run the caller query first, then inspect another function in the chain as needed:
mix xref callers MyApp.Accounts.update_user/2
mix xref callers MyApp.Accounts.get_user/1
Read the reported locations to see argument patterns.
| Pattern | Type |
|---|---|
def mount/3, def handle_event/3 | LiveView |
def index/2, def show/2, def create/2 | Controller |
def perform(%Oban.Job{}) | Oban Worker |
test cases passed, vs 10 / 19 without
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