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petropt

petropt/petro-mcp

calculate_effective_porosity

Calculate effective porosity from total porosity and shale volume using PHIE = PHIT * (1 - Vshale). Determines pore space available for fluid flow by excluding shale-bound water, critical for reservoir evaluation.

Instructions

Calculate effective porosity from total porosity and shale volume.

PHIE = PHIT * (1 - Vshale)

Args: phi_total: Total porosity (fraction v/v, 0-1). vshale: Shale volume (fraction v/v, 0-1).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
phi_totalYes
vshaleYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

No annotations provided, and the description does not disclose any behavioral traits beyond the calculation. No mention of side effects, permissions, or limits.

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?

Description is concise with formula and parameter details. No unnecessary words; front-loaded with clear purpose.

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?

Output schema exists, so return value is defined. Description covers input parameters adequately for a simple calculation. Could mention output name but not necessary.

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?

Description adds meaning to both parameters (fraction v/v, 0-1) beyond the schema's type and title. Schema coverage is 0%, so description compensates well.

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?

Description clearly states it calculates effective porosity from total porosity and shale volume, with explicit formula. Verb 'calculate' and resource 'effective porosity' are specific and distinct from sibling tools.

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?

No explicit guidance on when to use or when not to use. Usage is implied by the tool's purpose, but no alternatives or exclusions 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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