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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so 'Read-only' is redundant restatement. The description does add non-annotation context: the read is scoped to the connected learner and explicitly not for another learner, which is a meaningful authorization boundary.

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 tight sentences: the positive trigger first, the exclusions second. No filler, no repetition of the title, and the scope ('one certification') is front-loaded before the caveats.

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, but the description enumerates the returned content (progress, saved schedule, next study option), which is what an agent needs to decide to call it. It does not describe the response shape or how the 'next study option' is chosen, a minor residual gap for a zero-required-param tool.

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 optional enum parameter is fully documented in the schema, including the omit-default and that every result names its certification and lists others. The description only echoes 'for one certification' and adds no syntax or default behavior beyond the schema, 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?

Names a specific verb+resource ('see their CertArc study overview') and enumerates the contents: progress, saved schedule, next study option, scoped to one certification. It does not name the overlapping siblings (get_study_summary, get_study_plan, get_next_study_action), so the composite-vs-single-purpose distinction has to be inferred.

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?

'Use this when the connected learner wants to see their CertArc study overview' gives a clear trigger, and the negative clause rules out another learner, exam answers, and changing plans. It stops short of routing to alternatives for plan detail or next-action specifics, which would be needed for a 5 given the crowded sibling set.

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