create_json_tool

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

No annotations are provided, so the description carries full burden for behavioral disclosure. It discloses file generation behavior and malformed output capability, but it doesn't mention whether files are written to disk (though output_directory and filename parameters imply this), what happens on overwrite, or any side effects. The description doesn't cover permission needs, error behavior, or how output is returned, which is a notable gap for a generation tool. With no annotations, this falls short.

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

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

The description is concise: two sentences plus a short example line. It front-loads the primary purpose and then provides the key usage nuance (malformed flag). The example is helpful but could be more structured; overall it earns its place with minimal waste.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The tool has 8 parameters, 0% schema description coverage, and an output schema exists (though not provided). The description is sparse relative to the tool's complexity. It lacks details on how parameters like depth, items, seed, and pretty affect the output, and doesn't explain the behavior of filename, output_directory, or overwrite. Output schema may cover return values, but the description doesn't guide users on parameter interplay. It's minimally viable but has clear gaps.

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

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

Schema description coverage is 0% since the description doesn't mention any parameter names, but the description does explain the 'malformed' parameter's purpose ('Set malformed=true for intentionally invalid JSON'). However, it doesn't add meaning for the other seven parameters (seed, depth, items, pretty, filename, overwrite, output_directory). Baseline is 3 because schema coverage is low (<50%), but the description only compensates for one parameter, so a 3 is appropriate.

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

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

The description clearly states 'Generate a JSON test fixture' using a specific verb and resource, and distinguishes from sibling tools by focusing on JSON generation. It mentions malformed JSON support, which is a key differentiator from other create_*_tool siblings, though it doesn't name alternatives explicitly.

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

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

The description gives a brief example of valid vs malformed usage ('valid JSON array, malformed JSON with trailing comma or missing bracket'), which implies when to use the malformed flag. However, it doesn't provide explicit context for when to use this tool over siblings like create_dummy_file_tool or create_corrupted_file_tool, nor any exclusions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.