Anthropic Claude Fable 5 MCP server — top-tier planning and code critique for handoff
Anthropic Claude Fable 5 MCP server — top-tier planning and code critique for handoff
An MCP (Model Context Protocol) server for Anthropic Claude Fable 5 — Anthropic's most capable, most expensive model ($10 / $50 per 1M input / output tokens, ~2× Opus). Built in Rust, it exposes Fable as specialized MCP tools (plan, critique, ask) so any MCP client can use them.
~/.config/mcp-server-fable/config.toml containing at minimum your api_key. See config.toml.example. ```toml api_key = "sk-ant-..."Compare MCP servers by category, or browse hosted MCP servers if you prefer an endpoint over a local process.
Check the linked publisher documentation and your connected client's tool list. Names and availability can vary with the server version and account permissions.
| Tool | What it does |
|---|---|
| plan | Flagship. Turn a goal (+ optional context) into an executor-ready implementation plan: numbered steps, exact paths/signatures, edge cases, acceptance criteria, |
| critique | Coverage-first review of code, a diff, or a design. Reports every finding with severity + confidence for downstream filtering. Optional focus. |
| ask | Raw one-shot query to Fable. Multi-turn history, system prompt, effort, optional reasoning summary. |
| goal | string |
| context | string |
| effort | string |
| max_tokens | integer |
| content | string |
| focus | string |
| prompt | string |
| system_prompt | string |
| messages | string |
| show_reasoning | boolean |
{
"mcpServers": {
"fable": {
"command": "/absolute/path/to/mcp-server-fable/target/release/fable"
}
}
}From the project documentation. Replace placeholders and example paths before connecting.
~/.config/mcp-server-fable/config.toml containing at minimum your api_key. See config.toml.example. ```toml api_key = "sk-ant-..."The original Chromium automation reference server — simple, screenshot-driven browser control.
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