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

No annotations are supplied, so the description carries the behavioral burden. It makes clear this is a look-up of an existing part's recorded data rather than a mutation, and it sketches the returned categories. It says nothing about permissions, cost, pagination, or what happens when a lookup misses.

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?

The single sentence is front-loaded with the core purpose, which is good. It then sprawls through dense, undefined internal terminology ('signed verdict', 'effect family by family, descriptive', 'rewordings') that costs the reader more than it conveys.

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 and no annotations, the description does the work of indicating what comes back: measurements across settings, notebook verdicts, effect families, and reworking outcomes. That is adequate orientation for a two-parameter lookup tool, though the vocabulary remains too opaque to fully prepare the agent for the response shape.

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%, so the schema already documents both fields and the baseline is 3. The description does add a little: it presents id and text as alternatives ('or') and stresses that text must be the 'exact' words or label, which is matching semantics the schema does not state.

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 names a specific verb and resource: fetch one part's datasheet containing everything OPSIN has measured about it. It distinguishes itself from siblings by pointing to opsin_ask and /v1/parts as id sources. The enumerated contents ('signed verdict', 'what its rewordings did') are jargon-heavy and only loosely convey what the payload is, which keeps it from a 5.

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 tells the agent how to locate the target: a 16-hex id obtainable from opsin_ask or /v1/parts, or the part's exact words or label. That is concrete routing context with a named sibling. It offers no explicit when-not guidance or exclusion against other retrieval tools, so it falls short of a 5.

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