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

Annotations are all false and uninformative, so the description carries some burden. It adds useful behavioral context: this is paid access, priced at 0.01 USDC per query, with a 20-query session cap. However, it does not disclose whether a successful query consumes balance, whether it returns partial results on failure, or any authentication/receipt requirements beyond the stated sequence.

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 compact: three sentences deliver pricing, limit, free-preview alternative, and the required sequence. It is front-loaded with the core purpose sense. The listing detail feels slightly niche but is still information-bearing; there is minimal padding.

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 absence of an output schema; a paid, multi-step workflow with five parameters; and financial side effects, the description is incomplete. It explains the general flow but leaves critical execution details — exact query semantics, what the response contains, k meaning, and how delivery_receipt/sandbox_receipt affect invocation — to the agent to infer.

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 only 40%, and the tool description adds no parameter-level meaning. It never explains query format, the k parameter, sandbox_receipt, or delivery_receipt semantics. The schema itself documents only three of five parameters, so the description should compensate but does not.

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 states the tool provides paid per-query access to live data listings and includes the concrete listing (Debian Security Advisories at 0.01 USDC per query). The sequence data_session_open → data_session_fund → data_session_query makes the tool's role as the query step clear)Skip; while the verb 'buy' is slightly imprecise, the title and sequence resolve the intent.

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 explicitly provides the intended call sequence and contrasts the free first taste via data_preview with paid per-query access here. It does not spell out exclusions like 'do not use before funding', but the sequence strongly implies when this tool should be used.

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