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format_format_truncate

Truncate text to a specified maximum character length, appending an optional suffix (default '…') when the text exceeds the limit.

Instructions

[format] Truncate text to max_length, appending suffix (default '…').

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
textYes
max_lengthNo
suffixNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

No annotations are provided, so the description must carry the full burden. It describes the basic truncation and suffix appending behavior, but does not disclose details like character vs byte counting, handling of null max_length, or any side effects. Adequate but not rich.

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 a single, well-structured sentence that conveys the essential information without any redundant words. It is appropriately sized and front-loaded.

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?

For a simple truncation tool with 3 parameters, the description covers the core functionality and key parameter defaults. An output schema exists (indicated by context signals), so return value documentation is not needed. Could mention the output type, but overall complete enough.

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

Parameters3/5

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

The description adds value by mentioning the default suffix '…', which is not in the schema. However, it does not fully explain that max_length and suffix are optional, or what happens when max_length is null. The schema provides parameter names but no descriptions (0% coverage). The description partially compensates.

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 verb 'truncate', the resource 'text', and the behavior (truncate to max_length, append suffix). It is distinct from sibling format tools which handle other formatting tasks like bytes, currency, etc.

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

Usage Guidelines4/5

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

The description implies usage for truncating text with a suffix. However, it does not explicitly state when to use this tool over alternatives or when not to use it. Among the format tools, it is the only truncation option, so context is clear but lacks explicit guidance.

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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