How do I connect Yggdrasil MCP Server to Claude?

Run `claude mcp add yggdrasil-mcp -- npx -y yggdrasil-mcp` in Claude Code, or add the same command and arguments under mcpServers in Cursor's mcp.json or Claude Desktop's claude_desktop_config.json, then restart the client. The blocks above are ready to paste.

Is Yggdrasil MCP Server free?

The listed licence is MIT. Check the upstream terms for permitted use and commercial requirements; a public repository does not by itself mean the software is free or open source. Connected APIs and hosted services may have separate charges.

What can Yggdrasil MCP Server do?

Yggdrasil MCP Server documents 4 tools to the agent, including archive_plans, get_plan, list_plans. The descriptions above come from project documentation. A live handshake does not test individual tool behavior.

Yggdrasil MCP

Unclaimed

by henrychong-ai

Reasoning orchestration MCP server — Tree of Thoughts with deep planning, branching, and revision. Drop-in replacement for sequential-thinking with critical Claude Code string coercion fix. Works with Claude Code, Claude Desktop, and any MCP client.

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01 / Choose your client

02 / Before you connect

Authentication is not specified. Check the project instructions before connecting.

Install the runtime required by the project and make it available to your client.

Project instructionsEnvironment variable names (optional)

Use names from the project instructions, separated by commas. Enter names only, never secret values.

03 / Add the configuration

Source: generated from public install instructions

claude mcp add --transport stdio 'yggdrasil-mcp' -- 'npx' '-y' 'yggdrasil-mcp'

Run in your terminal after replacing any placeholders.

04 / Check it in your client

Open your client’s MCP settings and confirm the server connects and lists its tools. A copied configuration does not confirm a working connection.

aiai-reasoninganthropicchain-of-thoughtclaudeclaude-codeclaude-desktopllmmcpmcp-server

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Security profile

Claimed and verified servers get a weekly static scan that shows what the code can reach: external services, environment variables, shell commands, agent configuration folders, plus any dependencies with known advisories. Claim this listing to get one. How the security profile works

Documented tools (4)

From project documentation. A server handshake does not verify each tool’s description or behavior.

archive_plans

Archive old plans by moving files to archive/YYYY/ subdirectory. Supports archiving both Yggdrasil index entries and Claude Code orphan files. Default mode is dry run (preview only).

get_plan

Retrieve a saved session by ID. Formats: markdown (default, finalized plans) or jsonl (full event log).

list_plans

List saved plans with unified view of Yggdrasil plans and Claude Code orphans. Supports pagination, source filtering, and keyword search.

promote_plan

Promote a Claude Code plan file to the Yggdrasil index. Renames the file to YYYYMMDD-{name}.md format and adds it to the index for unified discovery. Includes path traversal protection.

Tool change history

Compared across complete checks of the same configuration. Tools were listed, not invoked. Input-schema changes are not measured here.

No complete tool checks yet.

FAQ

Questions about Yggdrasil MCP Server

How do I connect Yggdrasil MCP Server to Claude?: Run `claude mcp add yggdrasil-mcp -- npx -y yggdrasil-mcp` in Claude Code, or add the same command and arguments under mcpServers in Cursor's mcp.json or Claude Desktop's claude_desktop_config.json, then restart the client. The blocks above are ready to paste.
Is Yggdrasil MCP Server free?: The listed licence is MIT. Check the upstream terms for permitted use and commercial requirements; a public repository does not by itself mean the software is free or open source. Connected APIs and hosted services may have separate charges.
What can Yggdrasil MCP Server do?: Yggdrasil MCP Server documents 4 tools to the agent, including archive_plans, get_plan, list_plans. The descriptions above come from project documentation. A live handshake does not test individual tool behavior.