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Patterns for parallel subagent execution using Task tool with run_in_background.
Passed 20 of 24 test cases with the skill, and 16 of 24 without it.
and 4 more in the full report
5 fixed15 passed either way3 still failing1 broke1 errored
Tokens, turns and time describe resource use, not a dollar price.
One of 5 test cases the skill fixed. Same model, same prompt, with and without the skill.
When attempting to spawn subagents in an environment running Claude Code version 2.1.60, should tool call invocations use `Agent` or `Task`?
| Checked | Without skill | With skill |
|---|---|---|
| Recognizes that Task functions as a supported tool alias for Agent | Missed | Passed |
The instructions your model reads when the skill loads.
Parallel execution spawns multiple subagents simultaneously using the Agent tool (named Task before Claude Code 2.1.63; Task still works as an alias). Subagents run in the background by default, so N tasks run concurrently, dramatically reducing total execution time.
Critical Rule: ALL Agent calls MUST be in a SINGLE assistant message for true parallelism. If the calls are in separate messages, they launch one after another.
Before spawning, verify tasks are independent:
Each subagent receives a custom prompt defining its role:
You are a [ROLE] specialist for this specific task.
Task: [CLEAR DESCRIPTION]
Context:
[RELEVANT CONTEXT ABOUT THE CODEBASE/PROJECT]
Files to work with:
[SPECIFIC FILES OR PATTERNS]
Output format:
[EXPECTED OUTPUT STRUCTURE]
test cases passed, vs 16 / 24 without
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