lookup_pincode

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

With no annotations provided, the description carries the full burden. It discloses caching behavior, which is a positive. However, it does not mention rate limits, data freshness, error handling, or any potential side effects beyond cache optimization.

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 extremely concise with two sentences, front-loading the purpose and key detail (caching). Every word adds value without unnecessary elaboration.

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?

Given the tool's simplicity (one parameter, no output schema), the description adequately covers purpose and caching. It lists the types of location details returned, which compensates for the lack of an output schema. A 5 would require mention of error states or source authority.

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 coverage is 100% (one parameter with schema description). The description adds no further semantics beyond the schema's explanation of the pincode parameter, so it meets the baseline but does not exceed it.

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 the tool retrieves location details for an Indian postal PIN code, listing specific output fields (Post Office name, Block, etc.). It uses a specific verb 'Retrieves' and resource 'location details for an Indian Postal PIN code', which distinguishes it from siblings like 'check_pincode_serviceability' that likely serve a different purpose.

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 mentions caching for optimization but does not provide explicit guidance on when to use this tool versus alternatives like 'check_pincode_serviceability'. Usage context is implied but not clearly delineated.

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