MarketNow Registry / Developer Tools / @mcp-b/webmcp-polyfill

@mcp-b/webmcp-polyfill

Strict WebMCP core runtime polyfill for document.modelContext (with deprecated navigator.modelContext alias)

Developer Tools v5.1.0 by GitHub Actions

Trust score

72/100

Install risk

Runs registry code

Downloads / week

100

Source

npm-registry

Indexed

2026-09-10

Install

$ npx -y @mcp-b/webmcp-polyfill

Installing via npx/uvx/npm install executes arbitrary code from the public registry on your machine. This is the install-risk semantic of the MarketNow catalog — verify the publisher before running it.

Adoption evidence: 100 weekly registry downloads.

How MarketNow scored this

Sentinel Index Heuristics — a security-first estimate from public signals:

Package age and release activity (stale repositories lose points)
Verified adoption: registry downloads or GitHub stars, not follower counts
Typosquat distance against the 150 most-installed MCP packages
Injection markers scanned in the package description

Heuristic, not a guarantee. For verified agent credentials and revocation, see the MarketNow Trust API.

What is @mcp-b/webmcp-polyfill?

Strict WebMCP core runtime polyfill for document.modelContext (with deprecated navigator.modelContext alias) Indexed by MarketNow with trust 72/100 (Runs registry code).

How do I install it?

Run $ npx -y @mcp-b/webmcp-polyfill Installing via npx/uvx/npm install executes arbitrary code from the public registry on your machine. This is the install-risk semantic of the MarketNow catalog — verify the publisher before running it.

What does the trust score mean?

Security-first heuristic over public signals (age, adoption, typosquat distance, injection markers). It is not a popularity ranking and not a guarantee of safety. @mcp-b/webmcp-polyfill scores 72/100.