Add Agent Island to Specialized CLI Tools

[tristan666666]

Summary

Adds Agent Island to ### Specialized CLI Tools — a native desktop companion that shows live session state, your-turn alerts, and quota and cost for Claude Code, Codex, Antigravity, Grok and Cursor. I am the author.

Type of Change

• New tool/resource
• Update existing entry
• Fix broken link
• Improve documentation
• Other (please describe)

Checklist

• I have read the CONTRIBUTING guidelines
• Tool/resource follows the awesome list format
• Links are working and tested
• Entry includes: Tool name, Pricing, Best For, Why It's Awesome
• No promotional/marketing language (focus on utility)
• Alphabetical order maintained (if applicable)

Additional Context

Two corrections to my own earlier version of this PR:

1. It was in the wrong table. The entry sat under ## AI Agents & Autonomous Coding, whose blurb is "AI that doesn't just assist — it works independently on complex tasks." Agent Island runs no agent loop and takes no autonomous action; it watches sessions and tells you when one needs you. Listing it there would have misled anyone reading that section for autonomous tools.

The right home is ### Specialized CLI Tools, which already holds Agent FM (Agent monitoring, "Local macOS companion for Claude Code and Codex sessions") and agenttrace (Session observability). Same job, same header shape, so this is a drop-in. Placed directly after Agent FM as the closest neighbour rather than at the end of the table.

2. It was typed as an update. The PR was titled "Update Agent Island for 2.1.2", but grep -ci agent-island against README.md on main returns 0. It is a first-time add and is now titled and ticked as one.

Facts behind the row: MIT, 120 stars, v2.1.2 shipping macOS and Windows from one tag on 2026-08-09. Quota comes from each provider's own endpoint using tokens already on the machine; no account, no product telemetry.

[tristan666666]

Updating this for Agent Island 2.1.2, released today — the entry named a provider the app no longer supports.

Gemini CLI is out; Antigravity is in. Google retired Code Assist for individuals on 2026-06-18 and pointed those users at Antigravity, so the slot followed them. Every Gemini* source file is gone from the codebase in 2.1.2; the provider set is now Claude Code, Codex, Antigravity, Grok and Cursor.

2.1.2 also ships macOS and Windows from the same tag for the first time (AgentIsland-2.1.2.dmg and AgentIsland-2.1.2-win-x64.zip).

The diff is unchanged in shape — one line, one word. I am the author, and I would rather correct this myself than have the entry go stale in your list.