Deepnatal MCP Server

A natal chart engine that cross-verifies every result three independent ways - and refuses to answer when it can't. Its 4 documented tools cover calculate, chart. It runs locally over stdio via the published package.

People who work with calculate and chart and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-08-29 · ★ 2 · #28 OF 55 MAINTAINED WEB FRAMEWORK · VERIFIED 2026-09-18

MIT · TypeScript servers · how we verify → /methodology

01 · Install Deepnatal

Claude Code

claude mcp add breezefeng-deepnatal -- npx -y deepnatal

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "breezefeng-deepnatal": {
      "command": "npx",
      "args": [
        "-y",
        "deepnatal"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

repo age created 2026-08-29 - young repo, little track record yet

license MIT - declared in the repository

npm package deepnatal - unscoped; check the name against the project README before installing

registry namespace io.github.breezefeng is GitHub-verified and matches the repo owner

03 · What Deepnatal can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

An agent gets 4 documented tools spanning calculate, chart, including calculate_natal_chart, calculate_chart_without_birth_time, verify_ascendant, inspect_historical_timezone.

Capability map

Tools grouped from the project's README - what Deepnatal lets an agent do.

Calculate

2 tools - e.g. Ten planets with sign, degree, house, retrograde; ascendant, midheaven, twelve cusps. Fails rather than returning a chart the two engines disagree on.; Only what's knowable without a time. Lists what's…

calculate_natal_chart · calculate_chart_without_birth_time

Verify

1 tool - e.g. Recomputes via pure geometry and adjudicates a value from another tool. Accepts Virgo, 處女座, 12 Leo, Leo 12°34', or a bare longitude.

verify_ascendant

Inspect

1 tool - e.g. What the historical tzdata actually did on that date, and whether DST was in effect.

inspect_historical_timezone

04 · Who maintains Deepnatal

deepnatal is maintained by breezefeng. It's the only MCP server we track from this author; the repo dates to Aug 2026.

05 · Facts

repository: github.com/breezefeng/deepnatal
website: https://deepnatal.com/
category: web framework - ranked #28 of 55 actively-maintained web framework servers as of 2026-09-18.
registry: io.github.breezefeng/deepnatal (active, first published 2026-08-29)
packages: npm:deepnatal

06 · Deepnatal FAQ

Is Deepnatal still maintained?

Yes - as of 2026-09-18, its last commit was 2026-08-29. We re-verify nightly.

What can Deepnatal do?

An agent gets 4 documented tools spanning calculate, chart, including calculate_natal_chart, calculate_chart_without_birth_time, verify_ascendant, inspect_historical_timezone.

How do I install Deepnatal?

Run `npx -y deepnatal`. You can also paste the ready-made client config above.

Does Deepnatal run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Deepnatal

Alternatives to Deepnatal

Maintained web framework servers if Deepnatal isn't the fit.

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