webmcp.js

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webmcp.jsTyped WebMCP tools for web apps

Register validated, approval-aware browser tools with TypeScript, Zod, React bindings, and testing utilities.

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Typed tool definitions

Define named tools with descriptions, input schemas, risk levels, and strongly typed run functions.

Validation and JSON Schema

Use Zod as the developer-facing schema API while registering JSON Schema-compatible metadata.

Approval-aware execution

Require human or agent approval for high-impact actions through browser dialogs or custom providers.

React and tests

Register tools from React components and test validation, approval, rejection, and execution behavior in memory.

Status ​

WebMCP is an emerging browser API proposal. This library is an execution and safety layer around navigator.modelContext when that API exists. It does not define a protocol, ship a browser runtime, or create navigator.modelContext.

bash
pnpm add @webmcp-js/core zod

webmcp.js is not an official W3C, Chrome, Google, Microsoft, MCP, or MCP-B project.

Released under the MIT License.