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visualizer-mcp

visualizer-mcp

by htminuslab
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

vcc_recent_signals

Retrieve recent async signal notifications from Visualizer, such as vTimeChange and vDesignStateChange. Newest entries are listed last, and you can limit the results.

Instructions

Return recent async signal notifications received from Visualizer (e.g. vTimeChange, vDesignStateChange). Newest last.

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": "vcc_recent_signals"
  }
}

Input Schema

NameRequiredDescriptionDefault
limitNo

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.4/5.0
Behavior3/5

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

No annotations are provided, so the description must cover behavioral traits. It does indicate the type of notifications (async) and ordering, but does not disclose potential side effects, rate limits, or behavior when no signals are available. Some context is given, but gaps remain.

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?

The description is extremely concise: two short sentences that front-load the purpose and include an illustrative example. Every word adds value, with no redundancy or unnecessary detail.

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?

The tool has a simple interface with one parameter and an output schema, but the description still omits practical details like parameter semantics and common error scenarios. It is minimally complete but could better cover usage context without overcomplicating.

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

Parameters2/5

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

The input schema has a single 'limit' parameter with no description (0% coverage). The tool description does not mention the parameter or its effect, leaving the agent to guess. Although the name 'limit' is somewhat intuitive, the description should clarify how it controls the number of returned notifications.

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 returns recent async signal notifications from Visualizer, with concrete examples (vTimeChange, vDesignStateChange) and specifies ordering (newest last). This is specific and distinguishes it from sibling tools that handle other simulation operations.

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

Usage Guidelines2/5

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

No guidance is provided on when to use this tool versus alternatives like vcc_scan_signal (for current values) or vcc_get_time. The description lacks any 'when to use' or 'when not to use' information, leaving the agent to infer from the tool name alone.

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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