webmcp-tool-annotations
WebMCP Tool Annotations
Before writing code
Fetch live docs:
- Fetch
https://webmachinelearning.github.io/webmcp/for the annotations specification - Web-search
webmcp tool annotations readOnlyHint destructiveHint idempotentHintfor annotation field details - Web-search
site:developer.chrome.com webmcp annotations permissionsfor how Chrome uses annotations - Web-search
site:github.com mcp-b annotationsfor polyfill support for annotations
Conceptual Architecture
What Annotations Are
Tool annotations are optional metadata attached to a tool definition that inform the browser and agent about the tool's behavior and safety characteristics. The browser uses annotations to decide whether to prompt the user for confirmation before allowing agent invocation.
Available Annotations
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