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com.spacemushroom/materials

com.spacemushroom/materialsspacemushroom.comstreamable-httpv0.1.0Scanned

Read-only sourced engineering materials data: every value with unit, conditions and source.

11 tools: 3 change things and 8 only read.

Tools: 0 delete, 0 irreversible, 3 write, 8 read.
  • Reads private data · 0
  • Reads text others write · 0
  • Can send data out · 0
  • 1 finding

Anlyon alternative

3 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

Import an OpenAPI spec →
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Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

11 tools

Changes things 3Claude Code: ask
  • prove_claimEverything behind one value: as printed in the source, converted, the evidence level and what it means, the conditions, and each source with the place in it (and the passage where …No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Everything behind one value: as printed in the source, converted, the evidence level and what it means, the conditions, and each source with the place in it (and the passage where we have it).

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • resolve_designationWhich material a code names: a UNS number, EN number or name, DIN, JIS, AISI or SAE number, ASTM or AMS specification, or trade name (for example S31600, 1.4401, SUS316, A240).1 finding

    Why it is in this group

    • The name "resolve_designation" says "resolve": a word for reading.
    • The input takes a statement or command to run (input.code), which can change anything it can reach.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    Findings

    • Warn

      The server marks "resolve_designation" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

      Matched text

      annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "resolve_designation" says "resolve": a word for reading.

      What this check looks for
    Description, as the server wrote it
    Which material a code names: a UNS number, EN number or name, DIN, JIS, AISI or SAE number, ASTM or AMS specification, or trade name (for example S31600, 1.4401, SUS316, A240). Case, spaces and hyphens do not matter, and a short code also lists the codes that start with it. Each row gives the system, the code, a note (product form or a caveat) and whether the match is exact. A specification such as ASTM A240 covers many grades and returns every material that cites it. A note of "nearest equivalent" means the source itself hedges: do not treat the two as the same grade.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • what_is_missingFor one material and a list of properties: which have sourced data (and the strongest evidence) and which have none.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    For one material and a list of properties: which have sourced data (and the strongest evidence) and which have none. "no_data" means not covered yet, not known to be safe.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
Only reads 8Show 8 read-only tools
  • compareLine several materials up on one property, with each value, its conditions and its source.No findings

    Why it is in this group

    • The name "compare" says "compare": a word for reading.
    Description, as the server wrote it
    Line several materials up on one property, with each value, its conditions and its source. Values are also given in the property's canonical unit (value_canonical), so they can be ranked directly. Values measured under different conditions are listed separately and are not averaged.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • find_materialsRequirements in, candidates out.No findings

    Why it is in this group

    • The name "find_materials" says "find": a word for reading.
    Description, as the server wrote it
    Requirements in, candidates out. Each material gets a verdict: pass (every constraint met by a sourced value), fail, or unknown (no data on a constraint, so it cannot be ruled in or out). Every constraint reports pass, fail or no_data and the strongest evidence level behind it (flown, measured, derived, inferred, estimated, predicted). By default only passes and unknowns are returned, passes first. Context narrows which values count: at_temperature (degrees C; values measured at another temperature do not count), flown_only (only values measured in the real space environment), environment, include_failed, limit. Materials with no data on any constraint are not listed: use what_is_missing to see coverage for one material.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • get_materialThe sourced record of one material: sourced numbers with conditions, method and source location, plus uses, hazards, failure modes, corrosion and supply facts.No findings

    Why it is in this group

    • The name "get_material" says "get": a word for reading.
    Description, as the server wrote it
    The sourced record of one material: sourced numbers with conditions, method and source location, plus uses, hazards, failure modes, corrosion and supply facts. Optionally narrow to one property or fact topic.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • get_termA plain-language definition of a technical term or abbreviation used on material pages, for example ARC, SoC or adiabatic.No findings

    Why it is in this group

    • The name "get_term" says "get": a word for reading.
    Description, as the server wrote it
    A plain-language definition of a technical term or abbreviation used on material pages, for example ARC, SoC or adiabatic.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • list_claimsEvery current sourced value for one material (optionally one property) in canonical units, with evidence level and a claim_id.No findings

    Why it is in this group

    • The name "list_claims" says "list": a word for reading.
    Description, as the server wrote it
    Every current sourced value for one material (optionally one property) in canonical units, with evidence level and a claim_id. Use the claim_id with prove_claim to see the exact source and passage.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • list_propertiesThe property names in use, with their canonical unit and whether higher or lower is better.No findings

    Why it is in this group

    • The name "list_properties" says "list": a word for reading.
    Description, as the server wrote it
    The property names in use, with their canonical unit and whether higher or lower is better. Use these names with get_material and compare.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • search_materialsFind materials by name, abbreviation or formula.No findings

    Why it is in this group

    • The name "search_materials" says "search": a word for reading.
    Description, as the server wrote it
    Find materials by name, abbreviation or formula. Optionally filter by category slug (for example polymers, metals, energy). Returns ids to use with get_material.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • search_sourcesFull-text search over short passages quoted from our sources.No findings

    Why it is in this group

    • The name "search_sources" says "search": a word for reading.
    Description, as the server wrote it
    Full-text search over short passages quoted from our sources. Returns the passage, the source and the place in it. Passages are still being added, so an empty answer means none indexed yet.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or untrusted-input or outbound.

Reads private data0
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write0
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Findings

Matches of fixed checks, with the text they matched.

1 warn
  • Warnresolve_designation

    The server marks "resolve_designation" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

    Matched text

    annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "resolve_designation" says "resolve": a word for reading.

    What this check looks for

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 0.1.0. Values in angle brackets are yours to fill in.

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

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__materials__search_materials",
      "mcp__materials__get_material",
      "mcp__materials__compare",
      "mcp__materials__list_properties",
      "mcp__materials__get_term",
      "mcp__materials__find_materials",
      "mcp__materials__list_claims",
      "mcp__materials__search_sources"
    ],
    "ask": [
      "mcp__materials__prove_claim",
      "mcp__materials__what_is_missing",
      "mcp__materials__resolve_designation"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as materials. Review it before you use it.

Pin

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/com.spacemushroom/materials/verify?hash=f703fa188e25fab713afc8eba2f685f19ba444c6dc2c4e8dec1a40b81da63b46" | jq -e '.changed == false'

Pinned hash f703fa188e25, from Nov 2, 2026, 03:18 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/com.spacemushroom/materials/changes.xml

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Badge

anlyon.dev badge for com.spacemushroom/materials
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Source: MCP Registry · repository. Synced Nov 2, 2026, 03:17 UTC.