fakechat — Agent Skill
by anthropics · Updated
Localhost web chat for testing the channel notification flow. No tokens, no access control, no third-party service.
At a glance
fakechat is an Agent Skill by anthropics in the Coding & Engineering category. In Claude Code it installs with `/plugin install fakechat@claude-plugins-official` after adding the anthropics/claude-plugins-official marketplace; other assistants use its SKILL.md instructions as rules. Its source repository has 45,210 GitHub stars (as of Oct 28, 2026).
How to install fakechat in your AI client
Setup for Claude Code, Claude Desktop, Cursor, Codex, Windsurf, Cline and VS Code — copy-paste ready.
How to install fakechat in Claude CodeAnthropic's agentic CLI
Add the marketplace
claude/plugin marketplace add anthropics/claude-plugins-officialInstall the skill
claude/plugin install fakechat@claude-plugins-officialUse it
These are slash commands for a Claude Code session, not your shell. Claude auto-invokes the skill when your request matches its description — or type its slash command if it exposes one.
How to install fakechat in Claude DesktopDesktop app (MCP config)
Clone the source
bashgit clone https://github.com/anthropics/claude-plugins-official.gitFind the skill
It lives in claude-plugins-official/external_plugins/fakechat — that folder contains the SKILL.md.
Add the SKILL.md to your Skills folder
Settings → Capabilities → Skills → add the folder containing SKILL.md. Claude picks it up automatically.
How to install fakechat in CursorAI-first code editor
Clone the source
bashgit clone https://github.com/anthropics/claude-plugins-official.gitFind the skill
It lives in claude-plugins-official/external_plugins/fakechat — that folder contains the SKILL.md.
Convert to a Cursor rule
Create .cursor/rules/fakechat.mdc and paste the SKILL.md body. Set `alwaysApply` or a glob so the Agent loads it in context.
How to install fakechat in Codex CLIOpenAI coding agent
Clone the source
bashgit clone https://github.com/anthropics/claude-plugins-official.gitFind the skill
It lives in claude-plugins-official/external_plugins/fakechat — that folder contains the SKILL.md.
Reference in AGENTS.md
Add the skill's instructions (or a link) to AGENTS.md at your repo root — Codex reads it on every run.
How to install fakechat in WindsurfCodeium's agentic IDE
Clone the source
bashgit clone https://github.com/anthropics/claude-plugins-official.gitFind the skill
It lives in claude-plugins-official/external_plugins/fakechat — that folder contains the SKILL.md.
Add to your rules / context
Paste the SKILL.md instructions into this tool's custom rules or workspace instructions so the agent follows them.
How to install fakechat in ClineVS Code autonomous agent
Clone the source
bashgit clone https://github.com/anthropics/claude-plugins-official.gitFind the skill
It lives in claude-plugins-official/external_plugins/fakechat — that folder contains the SKILL.md.
Add to your rules / context
Paste the SKILL.md instructions into this tool's custom rules or workspace instructions so the agent follows them.
How to install fakechat in VS CodeCopilot / MCP support
Clone the source
bashgit clone https://github.com/anthropics/claude-plugins-official.gitFind the skill
It lives in claude-plugins-official/external_plugins/fakechat — that folder contains the SKILL.md.
Add to your rules / context
Paste the SKILL.md instructions into this tool's custom rules or workspace instructions so the agent follows them.
Documentation
Full READMEfakechat
Simple UI for testing the channel contract without an external service. Open a browser, type, messages go to your Claude Code session, replies come back.
Setup
These are Claude Code commands — run claude to start a session first.
Install the plugin:
/plugin install fakechat@claude-plugins-officialRelaunch with the channel flag — the server won't connect without this. Exit your session and start a new one:
claude --channels plugin:fakechat@claude-plugins-officialThe server prints the URL to stderr on startup:
fakechat: http://localhost:8787Open it. Type. The assistant replies in-thread.
Set FAKECHAT_PORT to change the port.
Tools
| Tool | Purpose | | --- | --- | | reply | Send to the UI. Takes text, optionally reply_to (message ID) and files (absolute path, 50MB). Attachment shows as [filename] under the text. | | edit_message | Edit a previously-sent message in place. |
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