OpenCode

Terminal coding-agent harness from Anomaly with project AGENTS.md, configurable primary agents and subagents, MCP support, and Claude-compatible SKILL.md discovery across .opencode, .claude, and .agents skill directories.

Why It Matters

OpenCode belongs in the Cross-Agent Harness Portability and future agent-harnesses capsule because it shares the same convergence pattern as Cursor, Claude Code, Codex, OpenClaw, and Hermes: markdown instructions, tool permissions, subagents, and AgentSkills-style SKILL.md files.

It is especially relevant to Kevin's portability model because OpenCode reads project-local and global skills from several compatible locations, including .agents/skills. That makes the existing ~/.agents/skills -> skills/personal bridge a plausible shared skill path for OpenCode too. Source: OpenCode skills docs, 2026-06-26

Current Routing Notes

• Install routes include npm package opencode-ai, Homebrew tap anomalyco/tap/opencode, native package managers, Docker image, and GitHub releases. Source: OpenCode intro docs, 2026-06-26
• /init analyzes a project and creates a root AGENTS.md; OpenCode recommends committing it. Source: OpenCode intro docs, 2026-06-26
• Built-in primary agents include Build and Plan. Build has full tools; Plan is restricted for analysis/planning. Source: OpenCode agents docs, 2026-06-26
• Built-in subagents include General, Explore, and Scout. General can execute multi-step work, Explore is read-only codebase exploration, and Scout is read-only external dependency/docs research. Source: OpenCode agents docs, 2026-06-26
• Custom agents can be configured in opencode.json or markdown files under global ~/.config/opencode/agents/ and project .opencode/agents/. Source: OpenCode agents docs, 2026-06-26
• Skills use SKILL.md with frontmatter fields name, description, optional license, optional compatibility, and optional string metadata. Names must match the skill directory and use lowercase hyphenated slugs. Source: OpenCode skills docs, 2026-06-26
• Skill discovery includes project .opencode/skills/*/SKILL.md, compatible .claude/skills/*/SKILL.md, .agents/skills/*/SKILL.md, and global ~/.config/opencode/skills, ~/.claude/skills, and ~/.agents/skills. Source: OpenCode skills docs, 2026-06-26

Capsule Fit

OpenCode should move under the future agent-harnesses capsule with:

• OpenClaw Harness
• Hermes Agent (Nous Research)
• Claude Code Harness
• Codex Harness (OpenAI)
• Cursor Harness
• AI SDK HarnessAgent

The comparison axes should be: instruction files, skill loading, subagent model, MCP/tool support, permission model, session model, config portability, and bootstrap wiring.

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Timeline

• 2026-06-26 | Added as a first-class tool page while specifying the future Agent Harnesses capsule. Source: User request, 2026-06-26; OpenCode docs, 2026-06-26