Chrome's developer team is showing web developers how to annotate their WebMCP tools so that browser agents make better UI decisions while better protecting end users.
WebMCP · Browser agent safety
Annotating WebMCP tools so browser agents act more safely
Chrome's developer guidance shows how tool annotations give browser agents more information before they act, helping them choose the right interface actions and reducing the risk of harm to users.
How annotations shape an agent's action
Step 1
Annotate tool
Developer describes what the tool does accurately.
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Step 2
Agent reads signals
Metadata shows when an action fits and when it has consequences.
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Step 3
Better UI decision
Agent selects the right interface action for the task.
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Step 4
Lower user risk
Fewer surprise consequences the user has not anticipated.
Why it matters
Agents are moving from answering questions to clicking, filling forms and completing tasks.
Page metadata becomes a safety issue as well as a usability one.
Chrome treats developer-supplied descriptions as a first line of defense.
Open questions
Specific annotation fields are pending the full walkthrough.
Performance in practice has not been independently verified.
Cross-browser compatibility and behavior across agents remain unclear.
Takeaway for developers
Describe tools with the same care as accessibility and security.
Be accurate
Describe what the tool really does, without overstating it.
Flag consequences
Signal when an action could have effects users may not expect.
Plan for routine use
Expect annotation practices to become part of standard implementation.
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