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jtt_from_api

Generate TypeScript types directly from API response samples to eliminate manual type creation.

Instructions

Generate types from API response samples

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
api_keyNo
directoryYesProject directory
Behavior2/5

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

With no annotations, the description must disclose side effects and operational behavior, but it only states the transformation at a high level. It does not say whether it fetches responses via api_key, writes files into the directory, or what output it produces, so an agent cannot anticipate the tool's full effect.

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

Conciseness4/5

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

The description is one short sentence with no filler and leads with the action. It could not be much terser, though it sacrifices useful detail for compactness.

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 generation tool with no annotations and no output schema, the description is too incomplete. It omits the output language/destination, whether network access is involved, and the role of api_key, so an agent lacks enough context to invoke it confidently.

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

Parameters2/5

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

Only one parameter (directory) has a schema description, while api_key is undocumented and the description does not compensate. 'API response samples' weakly implies api_key is for accessing an API, but this connection is not explicit enough for an agent to understand how to populate the parameter.

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 uses a specific verb ('Generate') and names the resource ('types') and source ('API response samples'). It clearly describes the core action, though it does not explicitly distinguish itself from the sibling tool jtt_from_json.

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?

'From API response samples' implies the intended use case: when you have API response samples and want types. However, it gives no explicit guidance about when to choose this over jtt_from_json or other type-related tools, leaving the comparison to inference.

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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