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build123d-mcp

build123d-mcp

by pzfreo
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

list_sessions

Read-only

Check current CAD session usage and idle times for the build123d server. See session count against configured limit without exposing session handles.

Instructions

Report how many CAD sessions this server process is holding, its configured limit, and how long each has been idle. Handles are secrets and are never returned. Operator/diagnostic tool for HTTP deployments — over stdio there is always exactly one session.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "list_sessions"
  }
}

Input Schema

NameRequiredDescriptionDefault

No arguments

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Addedv0.3.82

TDQS

A4.5/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Beyond the readOnlyHint annotation, the description discloses that handles are secrets and never returned, which is important security behavior, and explains the stdio vs HTTP session count difference. It adds useful context without contradicting the annotation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two concise sentences cover the main function, security caveat, and deployment context without redundancy. Every word adds value.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the simple scope (no params, read-only, has output schema), the description fully covers purpose, security, and operational nuance. It is complete for an operator/diagnostic tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool takes 0 parameters, so there is nothing for the description to explain. The schema coverage is trivially 100%, and the baseline for 0 params is 4.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb ('Report') and resource ('CAD sessions') and clearly states the three pieces of information returned: count, limit, and idle times. The phrase 'Operator/diagnostic tool' plus the HTTP/stdio distinction differentiates it from siblings like health_check and session_state.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It explicitly notes this is for HTTP deployments and that over stdio there is always exactly one session, providing clear context for when to use it. However, it doesn't explicitly name alternative tools, so it falls short of full when/not-to-use guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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