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Rubio-Enterprises

grocy-mcp

Battery Update Tool

battery_update_tool

Update battery details such as name, location, description, or charge interval to keep Grocy inventory accurate.

Instructions

Update a battery object.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameNo
batteryYes
used_inNo
descriptionNo
charge_interval_daysNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.2.0

TDQS

D1.7/5.0
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 disclosing side effects, yet it only repeats the word 'update'. It does not explain whether the operation is a partial update, whether null values clear fields, whether changes are reversible, or what happens to existing data; this is effectively no transparency.

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 single sentence is short but it earns its place only by restating the title; it is under-specified rather than efficiently complete. There is no front-loaded core information beyond what the name already conveys.

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

Completeness2/5

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

Despite a straightforward CRUD operation and an output schema, the definition lacks enough context to be safely invoked: no update semantics, no field explanations, and no use-case guidance. An agent would know the target resource but not what a successful update entails or how optional parameters behave.

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 mentions none of the five parameters. The schema provides names like name, used_in, description, and charge_interval_days, but neither the schema nor the description explains their meaning, format, or optionality semantics, so the description adds no parameter understanding.

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 'Update a battery object' is essentially a restatement of the tool name and title, adding only the generic noun 'object'. It identifies the resource, but says nothing about which attributes are updatable, so it is closer to a tautology than a purpose statement and does not clearly differentiate from sibling battery mutations like battery_charge_tool.

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?

There is no guidance about when to use this tool versus alternatives such as battery_create_tool, battery_charge_tool, or battery_details_tool. No conditions, prerequisites, or exclusions are stated, so an agent must infer usage entirely from the schema and sibling names.

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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