MCP & Tool Protocols
Tool result
The structured information returned after an AI system calls a tool.
Example
After a calendar lookup, the tool result returns the available time slots.
Why it matters
It gives an agent evidence for deciding what to do next.
You'll hear it
“The tool returned a receipt, but not confirmation that the delivery happened.”
Can you control it?
Set by the team
The people building or running the AI choose this setup. An everyday user generally needs their help to change how this part works.
Common questions
- Can a tool result contain instructions?
- Yes. Returned text may include instructions that should not automatically override the assigned task.
- Does a successful response guarantee correct data?
- No. The tool can return stale or mistaken information.
- Can an empty result be legitimate?
- Yes. There may simply be no matching record or nothing to report.