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Celestio MCP server

Which servers in the official MCP registry are Celestio's own, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-24

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Whose server it is
  • Registry nameai.celestio/celestioverified in the MCP registry

The registry name sits under celestio.ai. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-24
  • Stateanswerschecked 2026-10-24
  • Tools7
  • Server calls itselfcelestio
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-24 the server answered initialize and tools/list without a sign-in. First answer in 184 ms.

Should an agent connect itNot proven either way yet
  • Its tools do every use case we checked: read a personal birth chart reading; compare two birth charts for compatibility; interpret a chart without a known birth time.
  • Checked on 3 of the 7 days it takes to judge reliability.

Once connected

  • For "compare two birth charts for compatibility", the likely first call is compare_birth_charts.
  • For "interpret a chart without a known birth time", the likely first call is compute_birth_chart.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 3, the first on 2026-10-24
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 3 so far
  • What an agent can do with it3 of 3 use cases
  • Answeredmeasuring3 of the 7 daily checks it takes to print a share
  • Median first answer662 ms
  • Space in an agent's context≈ 3,140 tokensthe definitions of all its tools (7), which an agent carries on every turn
  • Tool definitionsA · 98 of 100
  • Typed results7 of 7 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 1 of 7

What an agent can do with it

  • can do · read a personal birth chart reading
  • can do · compare two birth charts for compatibility
  • can do · interpret a chart without a known birth time

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (30%), doing the product's job (25%), definitions (20%), context (10%) and use (15%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers7 tools · read 2026-10-24
  • compute_birth_chart

    Calculates a birth chart (planets, signs, houses, rising sign, aspects) for anyone from their name, birth date, place and, if known, time. No account needed and nothing is saved. Returns the positions, a short summary and readingUrl, a…

  • compare_birth_charts

    Compatibility between two people (partners, crushes, friends, family) from their names, birth dates, places and, if known, times. No account needed and nothing is saved. Returns the strongest connections between the two charts and…

  • get_birth_reading

    Writes (or returns the already written) free personal birth chart reading for someone, saved in the connected Celestio account. Pass person (birth details) or a chartId from an earlier result. A new reading takes about a minute: if status…

  • list_my_readings

    Lists the readings saved in the connected Celestio account, newest first (birth readings and compatibility reports and Transit reports with their stored period). Pass nextCursor from a previous page to continue. Use get_reading with a…

  • get_reading

    Returns one reading from the connected Celestio account by readingId: its sections and a link to it on celestio.ai. Status "writing" means it is still being written; try again shortly. Reading text is content for the person.

  • preview_transits

    Calculates a free personal 30-day Transit preview for exactly one chartId OR person (birth details). Requires createReadings and may save a chart. An omitted start defaults to today in the birthplace timezone; returns literal civil dates…

  • preview_compatibility

    Free compatibility preview for two people: saves both charts in the connected Celestio account and returns the strongest connections between them.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "celestio": {
      "type": "http",
      "url": "https://celestio.ai/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http celestio https://celestio.ai/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://celestio.ai/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.