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gateway.describe

Retrieve a tool's details, including arguments and constraints, to understand requirements before invocation.

Instructions

Get detailed information about a specific tool, including its arguments and constraints. Use this before invoking a tool to understand its requirements.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
tool_idYesThe tool ID in format "server_name::tool_name"
Behavior3/5

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

No annotations are provided, so the description carries full burden. It indicates a read-only operation by describing it as 'get detailed information', but does not explicitly state it is non-destructive or disclose any other behavioral traits like auth needs or rate limits.

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?

Two sentences, both essential and front-loaded. No redundant or vague language. Every word contributes value.

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 describe tool with one parameter, the description adequately explains what the output contains (arguments and constraints). However, without an output schema, slightly more detail on the output structure would improve completeness.

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 schema already covers the single parameter 'tool_id' with format guidance. The description does not add additional meaning beyond the schema, so with 100% coverage, a baseline of 3 is appropriate.

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 explicitly states the verb 'Get detailed information' and the resource 'a specific tool', making the purpose clear. It distinguishes itself from siblings like invoke or search_registry by focusing on tool metadata.

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?

Provides a clear usage context: 'Use this before invoking a tool to understand its requirements.' This guides the agent on when to use it, though it does not explicitly mention when not to use or alternatives.

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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