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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so safety is covered. The description adds real behavior beyond that: the list form returns titles and previews, while passing an id returns a full notebook — useful disclosure about output granularity.

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?

One efficiently front-loaded sentence that leads with the trigger and then enumerates the two modes. No filler, though the single-sentence form forces the packed 'id' semantics to be inferred.

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 two-parameter, optionally-filtered list tool with no output schema, the description covers the read purpose and partial return shape, but the unexplained 'query' parameter and absence of pagination or filtering behavior leave a noticeable gap.

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 carries the full burden. It explains the 'id' parameter implicitly (full notebook by id) but says nothing about the 'query' parameter, leaving half the inputs undocumented in both places.

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 (read) and resource (PerfuMate notebooks), and describes two distinct modes: listing titles/previews versus fetching one notebook in full by id. It distinguishes itself from the write/journal siblings by being the read path, though it doesn't name them 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?

"Use this when the user asks to read their PerfuMate notebooks" gives a clear trigger condition, but there is no exclusion guidance or mention of alternatives such as write_note or journal_note when the intent is to modify rather than read.

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