Structomat

com.structomat/steelstructomat.comstreamable-httpv1.4.4Scanned 3 hours ago

Structural steel engineering: 3D frame analysis, portal frame tonnage, checked steel connections.

7 tools: 4 change things and 3 only read.

Reads private data · 0
Reads text others write · 0
Can send data out · 0
2 findings

Tools listed without sign-in. Remote posture

Anlyon alternative

4 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 →

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.

7 tools

Changes things 4Creates or changes something that can be changed back.Claude Code: ask

about_structomatFacts about Structomat, an AI engineering agent for structural steel: what it does, design codes, who signs designs for construction, what to send, what comes back, how to start.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
Facts about Structomat, an AI engineering agent for structural steel: what it does, design codes, who signs designs for construction, what to send, what comes back, how to start. Use when the user asks about Structomat or how to engage it.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
analyze_frameRuns a 3D finite-element frame analysis and returns the numbers: equilibrium check, largest deflection along the members, largest joint displacement and sway in X and Y, every supp…1 finding
Why it is in this group
- The name "analyze_frame" says "analyze": a word for reading.
- The description's first verb is "run": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "analyze_frame" 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 "analyze_frame" says "analyze": a word for reading.
  What this check looks for
Description, as the server wrote it
Runs a 3D finite-element frame analysis and returns the numbers: equilibrium check, largest deflection along the members, largest joint displacement and sway in X and Y, every support reaction, the axial force, shears and moments of every member (the envelope with the governing combination when there are several), and natural periods with mass participation (modal analysis); linear or second order (P-Delta). The model is either a template (a pitched portal frame building, an open mono-pitch canopy, or a multi-storey frame, from a few dimensions, sections and loads) or a full model in JSON (nodes, members, sections, supports, loads, combinations). It is solved by the code of Structomat's free 3D frame analysis page, so the result also has a link that shows the same model and results in 3D (deflected shape, force diagrams, mode shapes). Use it to check a frame, compare sections or see how loads flow, and run it again with changed sections or loads. Elastic analysis only, not a code check: member buckling, connection design and code load combinations are not covered. Nothing is stored.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
draft_project_requestPrepare an e-mail to Structomat (info@structomat.com) describing a project, ready for the user to review and send.1 finding
Why it is in this group
- The name "draft_project_request" says "request": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "draft_project_request" 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 "draft_project_request" says "request": a word for a change.
  What this check looks for
Description, as the server wrote it
Prepare an e-mail to Structomat (info@structomat.com) describing a project, ready for the user to review and send. This tool sends nothing and stores nothing; it returns the draft text and a mailto link.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
estimate_portal_frame_steelSteel tonnage estimate for a single-span pitched portal frame building (span 15-30 m) before any design: total tonnes, kg per m2 of floor, a range, the weight by part (frames, gabl…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
Steel tonnage estimate for a single-span pitched portal frame building (span 15-30 m) before any design: total tonnes, kg per m2 of floor, a range, the weight by part (frames, gable posts, bracing, eave struts, purlins, side rails, plates and connections) and typical member sizes. Interpolated between complete finite-element designs and calibrated against published designs. Use for budgets, tenders and feasibility; a real design needs the actual loads and code.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

Only reads 3Looks things up and changes nothing.Show 3 read-only tools

find_examplesSearch Structomat's published work: steel projects, case studies, example situations, checked steel connections, measured benchmarks (e.g.No findings
Why it is in this group
- The name "find_examples" says "find": a word for reading.
Description, as the server wrote it
Search Structomat's published work: steel projects, case studies, example situations, checked steel connections, measured benchmarks (e.g. scan-to-BIM from a point cloud), sample deliverables (e.g. a complete US AISC shop drawing submittal with a clouded revision, or an erectability check that finds the pieces of a clash-free model that cannot get into place during erection) and free tools. Returns titles, links and short summaries.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
get_connectionDetails of one connection from the Structomat steel connection library: members, plates, bolts, welds, design code and the utilisation of each component.No findings
Why it is in this group
- The name "get_connection" says "get": a word for reading.
Description, as the server wrote it
Details of one connection from the Structomat steel connection library: members, plates, bolts, welds, design code and the utilisation of each component. Use find_examples with type "connection" to get slugs.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
list_servicesStructomat services (analysis & design, connection design, shop drawings, erectability check of a steel model before erection, automation consulting, custom tools) with what the cl…No findings
Why it is in this group
- The name "list_services" says "list": a word for reading.
Description, as the server wrote it
Structomat services (analysis & design, connection design, shop drawings, erectability check of a steel model before erection, automation consulting, custom tools) with what the client sends and what comes back.
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.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Tools listed without sign-in

Looked at Oct 29, 2026, 21:19 UTC, unchanged since Oct 29, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable: yes
HTTP status of an anonymous initialize: 200
tools/list served without credentials: yes
Tools that change things, listed without credentials: 4
Protocol version: 2025-06-18
WWW-Authenticate on 401: not observed
resource_metadata in WWW-Authenticate: not observed
RFC 9728 protected resource metadata: not observed
Authorization servers: not observed
Legacy HTTP+SSE transport: no
Dynamic client registration: not observed
Client ID metadata documents: not observed

WarnThe whole server
The endpoint served tools/list without credentials, and the list has 4 tools that change things (4 write). Whether a call also works without credentials was not tested: tools are never called.
Matched text
https://structomat.com/mcp/: tools/list returned 7 tools to an anonymous client, including about_structomat (write), estimate_portal_frame_steel (write), analyze_frame (write), draft_project_request (write)
What this check looks for

Findings

Matches of fixed checks, with the text they matched.

2 warn

Warnanalyze_frame
The server marks "analyze_frame" 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 "analyze_frame" says "analyze": a word for reading.
What this check looks for
Warndraft_project_request
The server marks "draft_project_request" 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 "draft_project_request" says "request": a word for a change.
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 1.4.4. Values in angle brackets are yours to fill in.

claude mcp add --transport http steel https://structomat.com/mcp/

claude mcp add --transport http steel https://structomat.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__steel__list_services",
      "mcp__steel__find_examples",
      "mcp__steel__get_connection"
    ],
    "ask": [
      "mcp__steel__about_structomat",
      "mcp__steel__estimate_portal_frame_steel",
      "mcp__steel__analyze_frame",
      "mcp__steel__draft_project_request"
    ],
    "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 steel. Review it before you use it.

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.structomat/steel/verify?hash=158b1b6ef0fccb7caa45fe895aca3fdc677090df5eabcbd76a4f3d1d308dee75" | jq -e '.changed == false'

Pinned hash 158b1b6ef0fc, from Oct 29, 2026, 21:17 UTC.

Watch

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

https://anlyon.dev/servers/com.structomat/steel/changes.xml

An Atom feed. Works in any feed reader or Slack's RSS app.

Badge

[![anlyon.dev](https://anlyon.dev/badge/com.structomat/steel.svg)](https://anlyon.dev/servers/com.structomat/steel)

Source: MCP Registry. Synced Oct 29, 2026, 21:17 UTC.