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format_json

Process JSON strings by formatting, validating, minifying, or prettifying them with configurable indentation options.

Instructions

Format, validate, minify, or prettify JSON

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
inputYesJSON string to process
actionYesAction to perform
indentNoNumber of spaces for indentation (0-10, default: 2)
Behavior2/5

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

No annotations are provided, so the description carries full burden. It lists actions but doesn't disclose behavioral traits like error handling (e.g., what happens with invalid JSON), performance characteristics, side effects, or output format details. The description is functional but lacks operational context needed for informed tool selection.

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 extremely concise with zero wasted words - a four-word phrase listing all key actions. It's front-loaded with all essential information and every word earns its place by specifying distinct functionalities. This is a model of efficiency for a multi-action utility tool.

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?

For a tool with 3 parameters, no annotations, and no output schema, the description is insufficient. It doesn't explain what 'format' versus 'prettify' means, how validation results are communicated, what minified output looks like, or error conditions. The agent lacks crucial context about tool behavior and outputs despite the complete parameter schema.

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?

Schema description coverage is 100%, providing complete parameter documentation. The description adds minimal value beyond the schema, only implying that 'input' is JSON and 'action' defines the operation type. It doesn't explain parameter interactions (e.g., 'indent' relevance to 'minify' vs 'prettify') or provide usage examples, meeting the baseline for high schema coverage.

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 tool's purpose with specific verbs (format, validate, minify, prettify) and resource (JSON). It distinguishes itself from siblings like format_bytes or format_text_case by specifying JSON as the target data format. However, it doesn't explicitly differentiate from potential JSON-specific siblings that might exist on other servers.

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. It doesn't mention prerequisites, when not to use it, or compare it to similar tools like validate_data or format_text_case for different data types. The agent must infer usage from the action enum and parameter descriptions 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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