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

With no annotations, the description carries the full burden and does substantial work: it declares the output structure (source name, exact query URL, UTC retrieval time, verbatim excerpt), the no-unsourced-numbers guarantee, empty-source behavior, AI-provenance disclosure, and the $1.05 USDC per-call x402 charge. What is missing is failure-mode behavior — timeouts, partial results, or what happens on payment failure.

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 input/output contract is front-loaded in the first two clauses, followed by the citation guarantees and the price. Every sentence carries distinct information — no filler, no repetition of the tool name.

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?

There is no output schema, so the description must describe the return value, and it does so concretely down to the per-figure citation fields. Cost and provenance are covered, which is rare. It falls short only on operational behavior such as latency expectations or error responses for a paid network call.

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 all three parameters are already documented, and the baseline is 3. The description confirms 'questions' drive the brief's required answers and that max_sources bounds citations, but adds little syntax or semantics beyond the schema. It does not mention the default of 5 or any bounds, which the schema covers anyway.

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 a concrete input/output contract: send topic, questions[], max_sources and receive one Markdown research brief with per-figure citations. That is a specific verb+resource, not a restatement of the name. It stops short of distinguishing itself from near-neighbors like cc0-daily-brief, so a 4 rather than a 5.

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 citation requirements and 'none found' guarantee signal that this is for sourced research rather than free-form writing. There is no explicit when-to-use, when-not-to-use, or named alternative among the siblings. The paid-call note hints at a cost tradeoff but never routes the agent.

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