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

Annotations already declare readOnly/idempotent/non-destructive, so the safety profile is covered; the description adds what the annotations cannot — the temporal-validity caveat and the presence of pending_acts, confidence, and flags that signal uncertainty. The one weakness is that the January–June warning is stated without explaining why that window is risky.

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?

Two dense sentences with purpose and parameters front-loaded and zero filler. The final caveat is compressed to the point of being slightly opaque, but it is still information-bearing rather than waste.

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, the description needn't enumerate return fields, and it correctly focuses on the reliability caveat instead. Coverage of both parameters plus the confidence/flags warning makes it callable without further reading; only sibling disambiguation and failure behavior are missing.

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 coverage is 0%, so the description must carry the parameter burden and largely does: it supplies an example section_id format ('31-16-15-25') and gives as_of's format and default (YYYY-MM-DD, today). It stops short of stating whether as_of accepts only ISO dates or what happens if the id is malformed.

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 concrete verb+resource ("Text of one section") with a well-formed example identifier and an explicit temporal dimension ("as of a date"). An agent can distinguish it from search/browse siblings, though it never names ic_get_versions, which is the nearest alternative for version-related questions.

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 closing sentence gives a real usage condition ("Check flags and confidence before relying on a date between January and June"), which is a useful caution. However, there is no explicit routing guidance against siblings like ic_get_versions or ic_resolve_citation, so the agent must infer which tool to reach for.

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