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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, openWorld), so the description's added value is the payload shape — it lists returned sub-fields and the underlying route GET /notebooks/{notebook}. Since there is no output schema, this return-format disclosure is genuinely useful; it stops short of describing pagination or error behavior, so not a 5.

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 plus the endpoint, front-loaded with the action and payoff ('Read one notebook: ...'). Every clause carries information; nothing is redundant.

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 compensates by enumerating return fields, and it explains the workflow dependency that motivates the call. For a single-parameter read tool with annotations already covering safety, nothing an agent needs to invoke it correctly is 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 description coverage is 100% and the single 'notebook' parameter is fully documented in the schema with its id format and provenance (notebook_list_notebooks / notebook_create_notebook). The description adds nothing about the parameter, so the 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?

'Read one notebook' gives a precise verb+resource, then enumerates exactly what comes back (title, sources with id/title/kind/status/words, Studio artifacts with id/type/status/title). That level of detail lets an agent distinguish it from notebook_list_notebooks and notebook_get_source without opening a schema.

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?

It states concrete use cases: retrieving source ids and verifying new sources reached status 'ready' before calling notebook_ask or notebook_generate_artifact. That is a real when-to-use with named downstream tools, but it gives no explicit exclusion (e.g. when to prefer notebook_get_source or notebook_list_notebooks instead).

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