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set_symmetry

Define unit cell dimensions and angles for a PyMOL selection to enable crystallographic symmetry display.

Instructions

Sets symmetry parameters for an object

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
aYes
bYes
cYes
betaYes
alphaYes
gammaYes
selectionYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

With no annotations, the description must disclose behavioral traits. It only states that symmetry parameters are set, but does not mention whether the operation is destructive, reversible, or what side effects occur (e.g., affecting rendering). The effect on the object is vague.

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

Conciseness3/5

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

The description is extremely concise (one sentence), which is efficient, but it sacrifices necessary detail. It front-loades the core action but omits critical information, making it inadequate for effective use.

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?

Given the high parameter count (7 required) and no parameter descriptions, the description is insufficiently complete. An output schema exists, but the description does not clarify the tool's behavior or return value, leaving significant gaps for the agent.

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 coverage is 0%, and the description adds no meaning to the seven parameters (a, b, c, alpha, beta, gamma, selection). No hints are given about their units, expected values, or roles, leaving the agent to guess their purpose.

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

Purpose4/5

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

The description clearly states the action (sets) and the resource (symmetry parameters for an object), making the purpose discernible. However, it does not differentiate from sibling tools such as 'set' or 'alter', which could be ambiguous.

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. The description lacks context about prerequisites or scenarios where set_symmetry is appropriate, requiring the agent to infer usage from the 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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