Chrome for Developers has advised developers building with WebMCP to properly annotate the tools they create, a brief reminder that tool metadata matters for anyone working with the framework.
WebMCP · Chrome developer guidance
Annotate your WebMCP tools: a short reminder that metadata matters
Chrome has advised developers building with WebMCP to properly annotate the tools they create. The guidance is brief and points to a linked resource, but it does not yet include a detailed specification, a release timeline, or a list of required fields.
Why annotation matters
Annotations give each tool a defined description that calling systems can read. The chain below shows the logic as described in the reminder.
STEP 1
Build the tool
Developers add tools to web apps and AI-assisted workflows.
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STEP 2
Annotate it
Add metadata that describes what the tool does.
→
STEP 3
Systems read it
Calling systems use the description to invoke the tool correctly.
→
OUTCOME
More predictable behavior
Tool use is clearer and easier to anticipate.
What the guidance says
Annotate the tools you create with WebMCP.
Treat it as a practical step for anyone already building with the framework.
A linked resource offers more, though its contents were not available for this report.
What remains unclear
How annotations are structured or validated.
Which fields, if any, are required.
How annotations are handled across browsers and tool types.
How widely WebMCP is being adopted.
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