fritzing-mcp

Fritzing Open Gui

fritzing_open_gui

Open sketch bundles in the Fritzing GUI to enable human review and editing of circuit designs.

Instructions

Open sketch(es) in the Fritzing GUI for human review.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "files": "<files>"
    },
    "name": "fritzing_open_gui"
  }
}

Input Schema

Name	Required	Description	Default
`files`	Yes	sketch paths to open

Output Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.1.0Sep 13, 2026

TDQS

A3.5/5.0

Behavior3/5

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

No annotations are provided, so the description carries the full burden. Saying it opens a GUI hints at a side effect on the host (spawning an application window) and that it's non-destructive, which is real behavioral value. But it does not disclose whether the call blocks until the window closes, whether it requires Fritzing to be installed/launched, or what happens on failure.

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?

One short sentence, front-loaded with the verb and resource, with zero filler. Nothing about it is padded or restated from the title.

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

Completeness3/5

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

An output schema exists, so return values need not be explained. But this is a side-effecting tool with no annotations in a 14-sibling family containing several visually overlapping names, and the description resolves none of that ambiguity nor states GUI/launch preconditions.

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

Parameters3/5

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

Schema description coverage is 100% with a single 'files' array parameter documented as 'sketch paths to open'. The description adds no further parameter meaning (format of the paths, relative vs absolute, one vs many windows). Baseline 3 applies when the schema does the heavy lifting.

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

Purpose4/5

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

Specific verb+resource+destination: 'Open sketch(es) in the Fritzing GUI for human review.' An agent immediately understands this launches a visual editor session rather than mutating files. However, it does not differentiate itself from nearby siblings like fritzing_show_sketch or fritzing_render, which sound like they also surface sketches visually.

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

Usage Guidelines3/5

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

'for human review' implies the intended context (a human wants to inspect output interactively), which is useful implied guidance. But there is no explicit when-to-use vs when-not, no statement of prerequisites (e.g., a GUI/display must exist), and no routing to the visual-but-non-GUI siblings.

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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