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claude-agents — multi-harness agentic plugin marketplace

Production-ready agentic-workflow building blocks: 84 plugins (82 local + 2 external), 192 agents, 156 skills, 102 commands. Native source-of-truth for Claude Code; also consumed by OpenAI Codex CLI, Cursor, OpenCode, and Gemini CLI from a single Markdown source.

This file is the canonical context file. Codex / Cursor / OpenCode read it directly. Claude Code reads it via CLAUDE.md, a symlink to this file. Gemini CLI reads it via gemini-extension.json (contextFileName) / .gemini/settings.json.

Read this file like a table of contents. Detail lives in docs/. Authoring conventions live in docs/authoring.md. Per-harness setup and capability deltas live in docs/harnesses.md. Gemini-specific setup is in GEMINI.md (also auto-loaded by Gemini CLI). This file should never grow beyond ~150 lines (per OpenAI's harness-engineering practice).

Map

Working in this repo

  • Python tooling: uv (package manager), ruff (lint/format), ty (type check). Do not use pip / mypy / black.
  • Plugins live under plugins/<name>/ with auto-discovery — see docs/authoring.md for frontmatter shapes.
  • Plugin names: lowercase, hyphen-separated. Never use __ (it's the adapter namespace separator).
  • Never commit secrets. Never run destructive git (force-push, reset --hard, branch -D) without explicit ask.

Quality gates (run these before pushing)

make validate STRICT=1     # structural validation across all harness outputs
make garden                # drift detection (dead links, stale artifacts, oversize skills)
make test                  # full pytest suite (plugin-eval + tools/tests/)
make smoke-test            # real-CLI subprocess tests against generated artifacts

CI (.github/workflows/validate.yml) runs all four on every PR plus installs OpenCode + Gemini CLI for live verification.

Regenerating per-harness artifacts

make generate HARNESS=codex      # .codex/skills, .codex/agents, .codex/plugins/<p>/, .agents/plugins/marketplace.json
make generate HARNESS=cursor     # .cursor-plugin/{marketplace,plugin}.json, .cursor/rules/
make generate HARNESS=opencode   # .opencode/{skills,agents,commands,plugins}/, opencode.json
make generate HARNESS=gemini     # skills/, agents/, commands/ at extension root
make generate-all                # all four

Generated artifacts are committed so each harness installs natively from a clone / GitHub URL (native-install commands in docs/harnesses.md). Run make generate-all before committing source changes — CI fails on drift. Source-of-truth lives only under plugins/; never hand-edit generated files.

Skills (cross-harness)

156 skills under plugins/*/skills/<n>/SKILL.md — discoverable by every harness:

  • Claude Code: auto-discovery via Anthropic's SKILL.md spec
  • Codex CLI: mirrored to .codex/skills/<plugin>__<skill>/ (8 KB body cap; detail in references/details.md)
  • OpenCode: mirrored to .opencode/skills/<plugin>-<skill>/ using hyphenated names for global install
  • Cursor: reads .claude/skills/ directly (no re-emit)
  • Gemini CLI: native skills at skills/<plugin>__<skill>/SKILL.md

Top-level skills/ is Gemini output; do not use it for OpenCode installs.

Subagents (cross-harness)

192 subagents under plugins/*/agents/<name>.md. Per-harness transpilation:

  • Codex: .codex/agents/<plugin>__<agent>.toml (drop tools:, map model alias to the GPT-5.x family, infer sandbox_mode)
  • OpenCode: .opencode/agents/<plugin>__<agent>.md with mode: subagent + permission: block (locked agents — those with source tools: [] — get deny-everything except base skill/task)
  • Gemini: agents/<plugin>__<agent>.md (April 2026 subagent spec)
  • Cursor: reads .claude/agents/ directly

Why this file is short

Per OpenAI's harness-engineering practice: this file is a map, not an encyclopedia. Procedural detail lives in skills (loaded on demand by agents). Reference material lives in docs/ (loaded when an agent navigates). A single bloated AGENTS.md crowds out the task, rots quickly, and is hard to verify mechanically. Keep it lean; push detail elsewhere.