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

Annotations already declare the full safety profile (readOnly=false, openWorld=false, idempotent=false, destructive=false), so the bar is lower. The description usefully adds caller provenance (only the fetch shim), the CORS-workaround motivation, and that the payload is pre-built, but it discloses nothing about auth requirements, rate limits, or the effect of the relayed POST on the ingest endpoint.

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?

Two sentences, purpose front-loaded, zero filler. The caller restriction and the 'not a chat tool' caveat both earn their place by preventing misuse.

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?

An output schema exists, so return values need not be described, and annotations cover the safety profile. The remaining hole is the four fully undocumented parameters on a generic relay tool, which the description does not address.

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% across four required parameters, so the description carries the burden and largely fails it. 'Already-built ... POST' weakly implies url/method/headers/body are passed through verbatim, but no parameter is explained, and the openWorldHint=false annotation sits awkwardly beside a caller-supplied url.

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+resource: it relays an already-built POST to sig(-staging).paytm.com, and explicitly says it is not a chat tool. That cleanly separates it from every bus/flight sibling, which an agent would otherwise have no reason to confuse it with.

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?

Gives both the when and the when-not: it is called only by pulse.js's fetch shim to bypass the widget sandbox's CORS block, and it is not for chat use. Nothing about selection is left to inference.

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