lookup_pincode

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

No annotations are provided, so the description carries the full behavioral burden. The word 'List' plus the domain (postal data) implies a read-only lookup with no side effects, which is reasonable, but it does not state that explicitly nor mention rate limits, auth, or behavior on invalid/nonexistent PIN codes.

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?

A single front-loaded sentence with zero filler; the resource and the input constraint both appear before the sentence ends. Nothing could be removed without losing information.

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?

For a one-parameter lookup with no output schema, the description covers the essential input constraint and names the main returned fields (post offices, district, state). It could say slightly more about the return shape (e.g., a list of post office records), but an agent has enough to call it correctly.

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%, so the description must compensate, and it does: it specifies the parameter is a 6-digit Indian PIN code, a constraint the bare string schema does not convey. It stops short of clarifying format edge cases (leading zeros, spaces, exactly six digits), so it is strong but not exhaustive.

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?

States a specific verb (List) and concrete return content (post offices, district, state) scoped to a 6-digit Indian PIN code, which is clearly distinct from lookup_ifsc (bank codes) and get_air_quality. However, it never acknowledges aqi_by_pincode, the sibling that takes the same pincode input, so the differentiation is left implicit rather than stated.

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?

Usage is implied by the stated return content — an agent can infer it is the tool for postal/address data on a PIN code. There is no explicit when-to-use statement, no mention of when to prefer aqi_by_pincode (which shares the pincode parameter), and no prerequisite or error guidance.

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