Building more effective AI agents
Anthropic. Anthropic engineers walking through what they actually changed when their multi-agent systems were misusing tools — collapsing endpoints, returning names instead of IDs, leaning on MCPs and Agent Skills instead of stuffing more tools into the system prompt. Maps point-for-point onto the article's checklist for tool descriptions and return-shape design.
AI Expert note
The examples are Anthropic-specific, but the design lesson is stable: reduce tool ambiguity, return useful identifiers and test tool choice on real tasks. Re-check current Agent Skills and MCP guidance before copying any product-specific pattern.
What you should get from this
Improve tool design so agents select the right action with the right parameters.
Watch or know first
Know the difference between a tool schema, tool description and agent instruction.
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