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travnie/claudin

v1.8.0Apache-2.0 AND ISC

Live official docs for Claude Code, claude.ai/Cowork, the Claude API, MCP, Agent Client Protocol (ACP), OpenAI/Codex and xAI/Grok: seven authless docs MCP servers plus docs-lookup (cited answers, nothing to build). For builders: plugin-dev (plugins across chat, Cowork, Claude Code, Codex/ChatGPT, Grok Build, Copilot CLI, Antigravity and Gemini CLI), mcp-dev (MCP servers, MCP Apps, OAuth, MCPB, directory review, spec 2026-07-28) and skill-creator-v2 (skill lifecycle: create, eval, benchmark, package, claude.ai compat).

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Claudin

Live official docs for Claude Code, claude.ai/Cowork, the Claude API, MCP, the Agent Client Protocol, OpenAI/Codex and xAI/Grok — looked up, not remembered. Plus builder skills for plugins, MCP servers and skills. Replaces Anthropic's plugin-dev and mcp-server-dev and the MCP mcp-apps plugin (their pins had gone stale: hook list, manifest fields, ext-apps 1.x, pre-2026 spec).

Just want answers

Install it and ask: "how do Claude Code hooks block a tool call?", "does Cowork run plugin agents?", "what changed in the MCP 2026-07-28 spec?". docs-lookup picks the right server, reads the full page and answers with the link. Nothing to build or configure.

Docs MCP (public, authless)Covers
claude-code-docs — https://code.claude.com/docs/mcpClaude Code: CLI, settings, hooks, subagents, skills, plugins, LSP, Agent SDK
claude-ai-docs — https://claude.com/docs/mcpclaude.ai/Cowork features, plugins & skills, surface support matrix, connectors, directory review
claude-platform-docs — https://platform.claude.com/docs/mcpClaude API, SDK reference, Managed Agents, models
mcp-docs — https://modelcontextprotocol.io/mcpMCP spec revisions, SDKs, extensions (Apps, Skills), Inspector
acp-docs — https://agentclientprotocol.com/mcpAgent Client Protocol (editor ↔ coding agent): spec v1/v2, libraries, registry, RFDs
openai-docs — https://developers.openai.com/mcpOpenAI API, Codex/ChatGPT plugins, Agent Plugins manifest, Apps SDK
xai-docs — https://docs.x.ai/api/mcpGrok Build (plugins, skills, hooks, MCP, CLI) and the xAI API

openai-docs matches an existing connector URL, so installing reuses it.

Building something

SkillWhat it does
plugin-devSurface matrix (chat/Cowork/Code/Codex/Grok Build), portable layout, gotchas, Claude Code component shapes, Claude→OpenAI conversion, other hosts (Grok Build, Copilot CLI, Antigravity, Gemini CLI, M365 Cowork)
mcp-devDeployment choice, tool design + directory rules, OpenAPI wrapping, OAuth (CIMD/DCR), MCP Apps (standard vs window.openai), Skills over MCP, MCPB, submission; scripts/mcp_probe.py probes any remote server (both spec eras) and lints annotations
skill-creator-v2Skill lifecycle hub: need-a-skill check, index reconcile, create/edit, evals + viewer + benchmark, description optimization (claude -p, Claude Code), OpenAI agents/openai.yaml, claude.ai compat audit, quick_validate / package_skill. Moved here from standalone (uninstall that copy)

Surfaces

  • claude.ai chat / Cowork: skills + the seven remote MCPs. The sandbox runs mcp_probe.py against public URLs.
  • Claude Code: same, plus claude plugin validate, Inspector, local servers, MCPB packing.
  • Codex / ChatGPT: .codex-plugin/plugin.json overlay; skills are provider-neutral where it matters.
  • Antigravity: agy plugin import claude, or the .antigravity-plugin/ + mcp_config.json overlay from the account build. Gemini CLI: needs a gemini-extension.json. Neither overlay is kept in this repo: both would duplicate the mcp.json URL list.
  • Grok Build, Copilot CLI: load this plugin as a Claude Code plugin, no extra files.

Docs for hosts without a bundled MCP (GitHub Copilot, Antigravity, Gemini CLI, M365) are fetched from their official sites; the GitHub, Google Developer Knowledge and Microsoft Learn connectors are used only if the session already has them.

Related, not duplicated: skill-creator-v2 (SKILL.md authoring, packaging, claude.ai compat), built-in plugin-authoring (mods), product-self-knowledge (plans, pricing), cloudflare (Worker hosting).

Sources and licenses: each skill's NOTICE.md / LICENSE.txt.

Also folded in (Nov 2026): the private openai-dev-kit (travnie/twojstar) — search/fetch standard, .app.json registration flow, MCP Apps archetypes and state-sync patterns, validation ladder, shortDescription ≤30 rule.

twojstar package

Canonical source here is the portable plugin.json + mcp.json + skills/; the Claude Code marketplace entry and the Codex overlay are generated (plugins/_shared/).

python -m pip install -r plugins/_shared/requirements.txt
python plugins/_shared/package_plugin.py plugins/claudin /tmp/claudin-1.8.0.zip

Claude Code: /plugin install claudin@twojstar (after /plugin marketplace add travnie/twojstar).