[snayyar00]

What this PR does

Adds the WebAbility accessibility plugin: a hosted MCP server that lets Grok Build scan pages and HTML for WCAG 2.2 AA, ADA and Section 508 issues, return source-level fixes, and verify each fix.

• Plugin name: webability
• Type: remote source
• Source URL + pinned SHA: https://github.com/snayyar00/webability-mcp.git @ 84e5f90b64dbcd2c74b8b4deec11665090f236b0
• Homepage: https://www.webability.io/mcp

Ownership

• I own this plugin or have the right to distribute it.
• The source repo is published under our official org (or I've explained why not below).

Checklist

• Added/updated exactly one entry in .grok-plugin/marketplace.json (valid JSON, kebab-case name).
• Remote source pins a full 40-char lowercase commit sha, and that commit is public + reachable.
• Regenerated .grok-plugin/plugin-index.json (python3 scripts/generate-plugin-index.py).
• python3 scripts/validate-catalog.py passes locally.
• python3 scripts/generate-plugin-index.py --check passes locally.
• homepage + clear description set; local plugins include README.md + .grok-plugin/plugin.json.
• License is stated (MIT, LICENSE in the source repo).

Security

• No curl | bash, remote-code download/exec, or postinstall RCE.
• No reading/exfiltration of secrets, tokens, .env, or env vars.
• Hooks and MCP scope are least-privilege.
• Network endpoints this plugin calls (and why): only https://mcp.webability.io/mcp (Streamable HTTP). The plugin is a single .mcp.json entry; no hooks, scripts, skills or local code run on the user's machine.
• Credentials/permissions it requires (and why): none to start. Anonymous use works with per-IP fair-use limits; signing in (OAuth) is optional and unlocks saved audits and higher limits.

Notes for reviewers

WebAbility.io is operated by TechyWeb Solutions; I am the founder. The source repo lives on my GitHub account snayyar00, which owns all WebAbility repos (the same repo backs our listings in the official MCP Registry as io.github.snayyar00/webability, the npm package @webability/mcp, and the Claude Code plugin). mcp.webability.io and webability.io are our domains.