Space Mushroom

npx add-mcp 'https://spacemushroom.com/mcp'

Space Mushroom MCP server

A free, read-only Model Context Protocol server for engineering materials. Every number it returns comes with its unit, the conditions it was measured under, the method and the source it was read from, so an AI assistant can quote a value and prove where it came from.

• Endpoint (Streamable HTTP): https://spacemushroom.com/mcp
• No API key, no sign-in. Read-only.
• Data: about 600 material profiles (metals, polymers, ceramics, composites, semiconductors, thermal protection, shielding, regolith and more, with a focus on space materials), licensed CC BY 4.0.
• Docs and setup page: https://spacemushroom.com/mcp-server/
• Website: https://spacemushroom.com · Open dataset: Zenodo, Hugging Face, GitHub

Tools

Tool	What it does
find_materials	Requirements in, candidates out. Each material gets pass, fail or unknown, with the evidence
search_materials	Find materials by name, abbreviation or formula
get_material	The sourced record of one material: values, conditions, uses, hazards, failure modes, corrosion, supply
compare	Line several materials up on one property, each value with its conditions and source
list_properties	Property names in use, with canonical units
list_claims	Every current sourced value for a material, with an evidence level and a claim id
prove_claim	Everything behind one value: as printed, converted, conditions, and where in each source
what_is_missing	Which properties have sourced data and which have none (not covered yet, not "safe")
resolve_designation	Which material a code names: UNS, EN, DIN, JIS, AISI/SAE, ASTM, AMS or a trade name
search_sources	Full-text search over short quoted passages from the sources
get_term	Plain-language definition of a technical term

Add it to a client

Claude Desktop, Cursor, VS Code and other clients that accept a remote server:

{
  "mcpServers": {
    "space-mushroom": { "url": "https://spacemushroom.com/mcp" }
  }
}

Claude Code:

claude mcp add --transport http space-mushroom https://spacemushroom.com/mcp

Example questions

• "Which stainless steels have a sourced minimum yield strength above 400 MPa, and what are the conditions?"
• "What material is UNS S31600 and what is its density, with the source?"
• "Compare PEEK, PEI and PPS on continuous service temperature."
• "What does Space Mushroom have no data on for Ti-6Al-4V?"

How accurate is it?

Profiles are drafted with AI assistance from cited sources and then checked automatically: every value must be found in its cited source, and every designation must be printed there. Values marked ai_checked were re-read by an AI assistant, not a person. See the methodology and editorial policy. Check the source before using a value in a safety-critical design.

Citation

Space Mushroom contributors (2026). Space Mushroom: open materials database. https://spacemushroom.com/ (CC BY 4.0)

Contact

hello@spacemushroom.com · Report a wrong value