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self-host-fusion360-mcp

by mystify59
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Python
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fusion_api_introspect

Read-only

Discover exact Fusion 360 API signatures by inspecting a class or object path. Filter members to find properties and methods, then use them with fusion_api_call.

Instructions

Inspect the live Fusion API: list a class's (or an object path's) properties and method signatures. target is a class name (e.g. 'ExtrudeFeatures') or a path ('rootComponent.bRepBodies'); query filters member names. Use this to discover the exact API to drive via fusion_api_call.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
queryNo
targetYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.6.0

TDQS

A4.5/5.0
Behavior4/5

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

Annotations already declare readOnlyHint and destructiveHint; description adds that it inspects the live API and lists signatures, providing context beyond annotations. No contradictions.

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?

Three sentences, front-loaded with main action, parameter explanations, and usage guidance. No wasted words.

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

Completeness4/5

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

While no output schema exists, the description explains what the tool lists (properties and method signatures). Slightly lacking on return format but adequate for a discovery tool.

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

Parameters5/5

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

Schema coverage is 0% with no descriptions, but the description provides detailed explanations for both parameters (target with examples, query with filtering), fully compensating for missing schema descriptions.

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 clearly states the tool inspects the live Fusion API to list properties and method signatures, with specific verb-resource pairing. It distinguishes from sibling fusion_api_docs by mentioning live inspection and direct usage to drive fusion_api_call.

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?

Explicitly advises using this tool to discover the exact API for fusion_api_call, providing clear context for when to use. Does not explicitly state when not to use or mention alternatives, but context is sufficient.

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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