Add hivemind to External Marketplaces

[Hanishchow]

Adds hivemind to the External Marketplaces table.

What it is

A Claude Code plugin marketplace for delegating mechanical work to headless opencode worker swarms running on free models, while Claude Code stays the planner, reviewer, and merger.

The design constraint is containment rather than parallelism:

• One-JSON-line worker contract — every worker returns exactly {ok, result, tokens, cost_usd, duration_ms}. Raw agent streams never enter the orchestrator's context, which is the whole point.
• Git-worktree isolation — every writing worker gets its own worktree, so concurrent agents can't corrupt each other's diffs.
• Explicit fallback ladder — worker fails, retry once; fails again, the orchestrator does that subtask itself; backend down, abandon the swarm and do the task directly. A swarm should never fail a task one agent could have finished.

Ships seven slash commands: /hive (auto-router), /oc, /swarm, /review-panel, /research-sweep, /migration, /test-fleet, plus scout / coder / tester worker personas.

Install

claude plugin marketplace add Hanishchow/hivemind
claude plugin install hivemind@hivemind

Verified against the repo's .claude-plugin/marketplace.json — marketplace hivemind, plugin hivemind, skill at ./skills/hivemind.

Notes

• Apache-2.0.
• It wraps the third-party opencode CLI, and the free tier belongs to opencode rather than Anthropic — both stated up front in a Prerequisites section rather than buried, along with a warning not to delegate secrets, since worker traffic leaves for opencode's endpoints.
• The same skill was merged into alirezarezvani/claude-skills#979.

One row, matching the existing table format and install-command style. Happy to move it to the Marketplaces list or Skills & Frameworks instead if that's a better fit.