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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint, so the safety profile is covered. The description adds useful behavioral context beyond that: results are 'likely' candidates, the search is 'bounded', and it is not producing reconciled/provenance-backed evidence. This helps set the right expectations for result reliability.

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 two sentences, front-loads the primary purpose, and then immediately provides the alternative-tool condition. Every sentence earns its place, with no filler or redundant restatement 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?

Given the output schema, strong annotations, complete parameter documentation, and an explicit sibling-tool pointer, an agent has everything it needs to invoke this tool correctly and decide whether it is the right choice for the task. No critical contextual gap is evident.

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%, and the input schema documents all five parameters with descriptions, examples, constraints, and required fields. The tool description itself does not need to repeat parameter details, so it meets the baseline for high schema coverage without adding extra per-parameter semantic value.

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 uses a specific verb ('Search'), a clear resource ('U.S. Copyright Office public records'), and a scope ('film, television, or underlying creative work'). It also explicitly distinguishes itself from the sibling tool by positioning this as a candidate-finding, bounded search rather than a reconciled-evidence dossier.

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 states exactly when to use this tool ('Use this free bounded search to identify candidates or evaluate applicability') and names the alternative condition explicitly ('If you need reconciled evidence... use filmrightsproof.trace_public_rights instead'). This gives an agent unambiguous routing guidance.

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