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

Annotations already declare the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false). The description adds genuine context beyond that: the relay mechanism, the sandbox limitation, and that the server selects the ingest endpoint. However, it says nothing about auth, retries, what happens on failure, or why the operation is non-idempotent, which matters for a write tool.

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?

Three compact sentences that are front-loaded with the core action and rationale. Nothing is padded, though the final clause about the server choosing the endpoint and accepting a batch is slightly redundant with the opening.

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 explained. But this is a non-idempotent write tool with an opaque string body and an undefined headers object at 0% schema coverage, and the description does not close that gap. It is minimally sufficient for an agent that already knows the Signal batch format, but not self-contained.

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% for both required parameters. The phrase 'accepts a Signal analytics batch' loosely maps 'body' to the batch payload, but gives no format, encoding, or structure detail. The 'headers' parameter is entirely unexplained, and its role (auth, content type) is left to inference.

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 gives a specific verb and resource: it 'sends the results cards' interaction analytics to Paytm's first-party Signal ingest.' It also explains the relay rationale (the card sandbox cannot reach the ingest), so an agent can tell this is a telemetry proxy rather than a search tool. It does not explicitly contrast with any sibling, but the sibling set (flight/bus search tools) is unrelated, so differentiation is moot.

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 only implied: 'The cards' analytics script calls this' suggests it is invoked by the analytics script rather than directly by an agent. There is no explicit statement of when to call it, prerequisites, or what to do instead. Adequate context but no actionable routing guidance.

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