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

Annotations already declare read-only, idempotent, non-destructive behavior, so the safety profile is covered. The description adds real behavioral context beyond that: results are limited to published replays, sorted newest first, and CE eligibility is conditional on a body approving a self-study version.

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 short sentences, front-loaded with the resource and sort order. The second sentence partially restates the CE condition already embedded in the first, a minor redundancy that keeps it from a 5.

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?

For a read-only listing tool with no output schema and fully covered parameters, the description supplies the missing context: what is returned (length, sponsor, CE credit), ordering, and the CE eligibility rule. Nothing essential to correct invocation is absent.

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 100% and the single 'topic' parameter is documented in the schema as 'Topic name or slug.' The description adds no filtering syntax or default behavior, so the baseline of 3 applies when structured data carries the parameter semantics.

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 resource and scope: 'Published replays of AdvisorIQ webinars, newest first,' plus what each entry carries (length, sponsor, CE credit). It is clearly distinguishable from siblings like upcoming_webinars, though it never names an alternative 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?

Usage is only implied: an agent can infer this is for browsing past/archived webinars, and the CE sentence hints at the relevance of the credit field. There is no explicit statement of when to use this versus upcoming_webinars or ce_requirements.

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