Create a deep link into a session

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description goes beyond them by disclosing the concrete return artifact — a URL carrying a ?time=SECONDS query — which is the key behavioral detail an agent needs.

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?

A single front-loaded sentence that states the output and its timing behavior with zero filler. Nothing is wasted and nothing redundant with the title beyond the minimum.

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 no output schema, the description correctly supplies the return-value shape (URL with time fragment), which is the crucial missing piece. It stops short of explaining how `id`, `timestamp`, or `format` interact, but for a simple read-only link generator this is largely sufficient.

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 50% and the "seconds" parameter has no schema description at all; the description's "?time=SECONDS" is the only explanation of it. However, the required `id` and the `timestamp`/`format` parameters get no clarification in the description, so it only partially compensates.

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 ("returns a URL") with a clear resource and effect (deep link into a session at a given time). An agent can tell it apart from generic session retrieval siblings, but it never explicitly names any of the 40+ siblings it must be chosen over.

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 implied by "so the user jumps straight to a chapter," which conveys the linking-at-a-timestamp scenario, but there is no explicit when-to-use guidance, no prerequisites, and no named alternative (e.g. wwdc_get_session).

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