# Claude Code Harness Extensibility -- Reference URLs

All URLs verified on **2026-04-02**. The documentation domain migrated from `docs.anthropic.com/en/docs/claude-code/` to `code.claude.com/docs/en/` (301 redirects in place).

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## Official Documentation

### Core Documentation Pages

| Topic | URL | Accessed |
|-------|-----|----------|
| Plugins (creating) | https://code.claude.com/docs/en/plugins | 2026-04-02 |
| Plugins reference (schemas, CLI, debugging) | https://code.claude.com/docs/en/plugins-reference | 2026-04-02 |
| Discover and install plugins | https://code.claude.com/docs/en/discover-plugins | 2026-04-02 |
| Plugin marketplaces | https://code.claude.com/docs/en/plugin-marketplaces | 2026-04-02 |
| Skills | https://code.claude.com/docs/en/skills | 2026-04-02 |
| Built-in commands | https://code.claude.com/docs/en/commands | 2026-04-02 |
| Hooks | https://code.claude.com/docs/en/hooks | 2026-04-02 |
| Hooks guide (practical examples) | https://code.claude.com/docs/en/hooks-guide | 2026-04-02 |
| MCP integration | https://code.claude.com/docs/en/mcp | 2026-04-02 |
| Subagents | https://code.claude.com/docs/en/sub-agents | 2026-04-02 |
| Agent teams | https://code.claude.com/docs/en/agent-teams | 2026-04-02 |
| Permissions | https://code.claude.com/docs/en/permissions | 2026-04-02 |
| Permission modes | https://code.claude.com/docs/en/permission-modes | 2026-04-02 |
| Settings | https://code.claude.com/docs/en/settings | 2026-04-02 |
| Memory (CLAUDE.md) | https://code.claude.com/docs/en/memory | 2026-04-02 |
| Model configuration | https://code.claude.com/docs/en/model-config | 2026-04-02 |
| Sandboxing | https://code.claude.com/docs/en/sandboxing | 2026-04-02 |
| Security | https://code.claude.com/docs/en/security | 2026-04-02 |
| Authentication | https://code.claude.com/docs/en/authentication | 2026-04-02 |
| Troubleshooting | https://code.claude.com/docs/en/troubleshooting | 2026-04-02 |
| Context window | https://code.claude.com/docs/en/context-window | 2026-04-02 |
| Tools reference | https://code.claude.com/docs/en/tools-reference | 2026-04-02 |
| Common workflows | https://code.claude.com/docs/en/common-workflows | 2026-04-02 |
| Quickstart | https://code.claude.com/docs/en/quickstart | 2026-04-02 |
| Scheduled tasks | https://code.claude.com/docs/en/scheduled-tasks | 2026-04-02 |
| Server-managed settings | https://code.claude.com/docs/en/server-managed-settings | 2026-04-02 |
| GitHub Enterprise Server | https://code.claude.com/docs/en/github-enterprise-server | 2026-04-02 |
| Channels | https://code.claude.com/docs/en/channels | 2026-04-02 |
| Remote control | https://code.claude.com/docs/en/remote-control | 2026-04-02 |
| Claude Code on the web | https://code.claude.com/docs/en/claude-code-on-the-web | 2026-04-02 |
| IDE integrations | https://code.claude.com/docs/en/ide-integrations | 2026-04-02 |

### LLM-Friendly Documentation

| Resource | URL | Accessed |
|----------|-----|----------|
| Full docs index (llms.txt) | https://code.claude.com/docs/llms.txt | 2026-04-02 |

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## Plugin Architecture

| Topic | URL | Accessed |
|-------|-----|----------|
| Plugin manifest schema | https://code.claude.com/docs/en/plugins-reference#plugin-manifest-schema | 2026-04-02 |
| Plugin directory structure | https://code.claude.com/docs/en/plugins-reference#plugin-directory-structure | 2026-04-02 |
| Environment variables (CLAUDE_PLUGIN_ROOT, CLAUDE_PLUGIN_DATA) | https://code.claude.com/docs/en/plugins-reference#environment-variables | 2026-04-02 |
| Persistent data directory | https://code.claude.com/docs/en/plugins-reference#persistent-data-directory | 2026-04-02 |
| Plugin caching and file resolution | https://code.claude.com/docs/en/plugins-reference#plugin-caching-and-file-resolution | 2026-04-02 |
| User configuration (userConfig) | https://code.claude.com/docs/en/plugins-reference#user-configuration | 2026-04-02 |
| Plugin channels | https://code.claude.com/docs/en/plugins-reference#channels | 2026-04-02 |
| Version management | https://code.claude.com/docs/en/plugins-reference#version-management | 2026-04-02 |
| Debugging and development tools | https://code.claude.com/docs/en/plugins-reference#debugging-and-development-tools | 2026-04-02 |
| CLI commands reference | https://code.claude.com/docs/en/plugins-reference#cli-commands-reference | 2026-04-02 |
| LSP servers | https://code.claude.com/docs/en/plugins-reference#lsp-servers | 2026-04-02 |

---

## Skills System

| Topic | URL | Accessed |
|-------|-----|----------|
| Skills overview | https://code.claude.com/docs/en/skills | 2026-04-02 |
| Frontmatter reference | https://code.claude.com/docs/en/skills#frontmatter-reference | 2026-04-02 |
| String substitutions | https://code.claude.com/docs/en/skills#available-string-substitutions | 2026-04-02 |
| Dynamic context injection | https://code.claude.com/docs/en/skills#inject-dynamic-context | 2026-04-02 |
| Invocation control | https://code.claude.com/docs/en/skills#control-who-invokes-a-skill | 2026-04-02 |
| Pass arguments | https://code.claude.com/docs/en/skills#pass-arguments-to-skills | 2026-04-02 |
| Run skills in subagent | https://code.claude.com/docs/en/skills#run-skills-in-a-subagent | 2026-04-02 |
| Restrict tool access | https://code.claude.com/docs/en/skills#restrict-tool-access | 2026-04-02 |
| Supporting files | https://code.claude.com/docs/en/skills#add-supporting-files | 2026-04-02 |
| Bundled skills | https://code.claude.com/docs/en/skills#bundled-skills | 2026-04-02 |
| AgentSkills.io standard | https://agentskills.io | 2026-04-02 |

---

## Hook System

| Topic | URL | Accessed |
|-------|-----|----------|
| Hooks reference | https://code.claude.com/docs/en/hooks | 2026-04-02 |
| Hooks practical guide | https://code.claude.com/docs/en/hooks-guide | 2026-04-02 |
| Hooks in skills and agents | https://code.claude.com/docs/en/hooks#hooks-in-skills-and-agents | 2026-04-02 |

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## MCP Support

| Topic | URL | Accessed |
|-------|-----|----------|
| MCP integration | https://code.claude.com/docs/en/mcp | 2026-04-02 |
| MCP registry API | https://api.anthropic.com/mcp-registry/docs | 2026-04-02 |
| Managed MCP configuration | https://code.claude.com/docs/en/mcp#managed-mcp-configuration | 2026-04-02 |

---

## Distribution

| Topic | URL | Accessed |
|-------|-----|----------|
| Plugin marketplaces | https://code.claude.com/docs/en/plugin-marketplaces | 2026-04-02 |
| Marketplace schema | https://code.claude.com/docs/en/plugin-marketplaces#marketplace-schema | 2026-04-02 |
| Plugin sources | https://code.claude.com/docs/en/plugin-marketplaces#plugin-sources | 2026-04-02 |
| CLAUDE_CODE_PLUGIN_SEED_DIR | https://code.claude.com/docs/en/plugin-marketplaces#pre-populate-plugins-for-containers | 2026-04-02 |
| Managed marketplace restrictions | https://code.claude.com/docs/en/plugin-marketplaces#managed-marketplace-restrictions | 2026-04-02 |
| strictKnownMarketplaces | https://code.claude.com/docs/en/settings#strictknownmarketplaces | 2026-04-02 |
| Official marketplace submission (Claude.ai) | https://claude.ai/settings/plugins/submit | 2026-04-02 |
| Official marketplace submission (Console) | https://platform.claude.com/plugins/submit | 2026-04-02 |

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## Subagents

| Topic | URL | Accessed |
|-------|-----|----------|
| Subagents overview | https://code.claude.com/docs/en/sub-agents | 2026-04-02 |
| Built-in subagents | https://code.claude.com/docs/en/sub-agents#built-in-subagents | 2026-04-02 |
| Frontmatter fields | https://code.claude.com/docs/en/sub-agents#supported-frontmatter-fields | 2026-04-02 |
| Preload skills into subagents | https://code.claude.com/docs/en/sub-agents#preload-skills-into-subagents | 2026-04-02 |
| Persistent memory | https://code.claude.com/docs/en/sub-agents#enable-persistent-memory | 2026-04-02 |
| Agent teams | https://code.claude.com/docs/en/agent-teams | 2026-04-02 |

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## Permissions

| Topic | URL | Accessed |
|-------|-----|----------|
| Permissions overview | https://code.claude.com/docs/en/permissions | 2026-04-02 |
| Permission rule syntax | https://code.claude.com/docs/en/permissions#permission-rule-syntax | 2026-04-02 |
| Tool-specific rules | https://code.claude.com/docs/en/permissions#tool-specific-permission-rules | 2026-04-02 |
| Permission modes | https://code.claude.com/docs/en/permission-modes | 2026-04-02 |
| Auto mode classifier | https://code.claude.com/docs/en/permissions#configure-the-auto-mode-classifier | 2026-04-02 |
| Managed settings | https://code.claude.com/docs/en/permissions#managed-settings | 2026-04-02 |
| Settings precedence | https://code.claude.com/docs/en/permissions#settings-precedence | 2026-04-02 |
| Example configurations | https://github.com/anthropics/claude-code/tree/main/examples/settings | 2026-04-02 |

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## Configuration

| Topic | URL | Accessed |
|-------|-----|----------|
| Settings overview | https://code.claude.com/docs/en/settings | 2026-04-02 |
| Configuration scopes | https://code.claude.com/docs/en/settings#configuration-scopes | 2026-04-02 |
| Settings files | https://code.claude.com/docs/en/settings#settings-files | 2026-04-02 |
| Plugin settings | https://code.claude.com/docs/en/settings#plugin-settings | 2026-04-02 |
| Permission settings | https://code.claude.com/docs/en/settings#permission-settings | 2026-04-02 |

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## Ecosystem

| Topic | URL | Accessed |
|-------|-----|----------|
| GitHub topic: claude-code | https://github.com/topics/claude-code | 2026-04-02 |
| Anthropic homepage | https://anthropic.com | 2026-04-02 |
| Claude Code product page | https://claude.ai/code | 2026-04-02 |
| MCP specification | https://modelcontextprotocol.io | 2026-04-02 |
| AgentSkills.io standard | https://agentskills.io | 2026-04-02 |

---

## Legacy URLs (Redirects)

The following old-domain URLs redirect with 301 to the new domain:

| Old URL | Redirects To |
|---------|-------------|
| `docs.anthropic.com/en/docs/claude-code/plugins` | `code.claude.com/docs/en/plugins` |
| `docs.anthropic.com/en/docs/claude-code/skills` | `code.claude.com/docs/en/skills` |
| `docs.anthropic.com/en/docs/claude-code/hooks` | `code.claude.com/docs/en/hooks` |
| `docs.anthropic.com/en/docs/claude-code/mcp` | `code.claude.com/docs/en/mcp` |
| `docs.anthropic.com/en/docs/claude-code/sub-agents` | `code.claude.com/docs/en/sub-agents` |
| `docs.anthropic.com/en/docs/claude-code/permissions` | `code.claude.com/docs/en/permissions` |
| `docs.anthropic.com/en/docs/claude-code/settings` | `code.claude.com/docs/en/settings` |
