feature
Claude Code

Agent tool accepts effort parameter for sub-agent reasoning levels

code.claude.comagent

The Agent tool now accepts an effort parameter to run sub-agents at specific reasoning levels (low, medium, high, xhigh, max). This lets developers optimize latency and cost by controlling computation intensity for different sub-agent tasks within workflows.

Stacks this affects

Claude Code ships in 4 tested stacks here.

Claude Code MCP setup
Code · Agent setup
$50/mo
Claude Code setup
Code · Agent setup
$50/mo
Claude Code only
Code · Workflow
$50/mo
Ship code with AI
Code · Workflow
$50/mo
All Claude Code changes and pricing

More Claude Code

releaseClaude Haiku 5.5 released as default Haiku modelfeatureTool schema registration supports immediate prompt listingfeatureAgent tool now accepts effort parameter for subagent configurationfeaturePrompt caching support added to mod $.model.complete APIfeatureWorkflow agents now available in agent.spawn mod hookfeaturePlugin install command gains --marketplace source parameter