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AB-021
MCP Tool Calls
What it means
Your MCP server responds when agents try to call a tool.
Why it matters
Listing tools isn't enough — agents need to actually call them. If calls fail, your MCP server is useless.
✗
What's wrong
MCP server lists tools but doesn't respond when agents try to use them.
✓
What's right
MCP server processes tool calls and returns results.
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