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Hardik-Singh

Invariance MCP

Official
by Hardik-Singh

invariance_write_node

Write a node to an Invariance run with run ID, action type, and optional input/output to capture agent behavior for debugging and observability.

Instructions

Alias of invariance_node_write

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
inputNo
outputNo
run_idYes
action_typeYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.3.0

TDQS

D1.3/5.0
Behavior1/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It merely points to another tool without revealing effects, side effects, required permissions, or any operational details. This is a significant gap for a write operation.

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

Conciseness2/5

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

The description is extremely brief, but this is under-specification rather than conciseness. It packs no information beyond a reference, so its brevity does not serve the agent's needs.

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

Completeness1/5

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

The tool has two required parameters and no output schema; the description fails to explain the tool's purpose, when to use it, or how parameters relate. It is entirely inadequate for correct invocation.

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

Parameters1/5

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

Schema description coverage is 0%, and the description provides no explanation of the four parameters (input, output, run_id, action_type). The agent is left entirely to infer meaning from names, which is insufficient.

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

Purpose2/5

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

The description only states 'Alias of invariance_node_write', which indicates the tool is a synonym for another tool but does not describe what it actually does. The name hints at writing a node, but the description adds no functional clarity.

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

Usage Guidelines1/5

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

There is no guidance on when to use this tool versus the sibling invariance_node_write or any other alternative. The alias reference suggests interchangeability but does not explain the context or selection criteria.

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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