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petropt

petropt/petro-mcp

calculate_vshale

Calculate shale volume (Vshale) from gamma ray log using linear, larionov, or clavier methods. Input GR, clean sand, and shale values.

Instructions

Calculate shale volume (Vshale) from gamma ray log.

Methods: linear, larionov_tertiary, larionov_older, clavier.

Args: gr: Gamma ray reading (API units). gr_clean: GR in clean sand (API units). gr_shale: GR in pure shale (API units). method: Calculation method. Default 'linear'.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
grYes
gr_cleanYes
gr_shaleYes
methodNolinear

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

With no annotations provided, the description carries the full burden. It describes the calculation and parameters but does not disclose behavioral traits like side effects, permissions, or output details. However, the presence of an output schema partially compensates.

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 highly concise, with a clear first sentence stating purpose, followed by methods and parameter list. Every sentence adds value without redundancy.

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?

Given the complexity of the tool and the presence of an output schema, the description adequately covers purpose, methods, and parameters. It lacks explanation of method differences but is otherwise complete for a calculation tool.

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

Parameters4/5

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

Schema description coverage is 0%, so the description adds meaning by listing all parameters with units and default for method. It explains what gr, gr_clean, gr_shale represent, though method options are not elaborated.

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 calculates shale volume (Vshale) from gamma ray log, using a specific verb and resource. It lists available methods, distinguishing it from sibling calculation tools.

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?

The description provides no guidance on when to use this tool versus alternatives among many sibling calculation tools. No exclusions or context for selection are mentioned.

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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