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

Beyond the annotations (readOnly/openWorld/idempotent=false), the description discloses a critical behavioral trait: cost ($0.10 USDC per call via x402 or prepaid credits) and that it is paid-only and excluded from the free trial. It also reveals the sources consulted and the report structure. It does not mention rate limits or latency, but the pricing disclosure is high-value.

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?

Front-loads the identity ('Premium research report...') before the mechanics, and the pricing caveat is a short, separate sentence. The middle sentence is dense but earns its place by listing sources and outputs; no obvious 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?

With an output schema present, return format need not be described, and annotations cover the safety profile; the description fills the remaining gaps (cost model, what is gathered, what the brief contains). Nothing essential to correct invocation is missing, though no guidance on failure/paid-gating behavior is given.

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 100%, so the schema already documents goal, library, and the ecosystem enum with defaults. The description adds no syntax or format detail beyond what the schema provides, so baseline 3 applies.

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 ('Premium research report on a library or API for coding agents') and enumerates the deliverable (summary, code, gotchas, risks, plus data sources checked). This clearly differentiates it from narrow siblings like docs-lib, package-audit, or repo-health, though it never names those siblings explicitly.

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 intended context ('for coding agents', 'for your goal') is implied but there is no explicit when-to-use statement versus the many overlapping siblings (docs-lib, package-audit, dependency-report). The scope of its aggregation is described but not the condition that selects it over cheaper alternatives.

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