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

Annotations already declare readOnly, idempotent, non-destructive and closed-world behavior, so the safety profile is covered. The description adds the useful detail of what the response contains, but says nothing about failure behavior (e.g. unknown synonym/identifier) or lookup resolution order among the four accepted forms.

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 well-formed sentences, front-loaded with the return payload and then the accepted inputs. The field list is long but each item is load-bearing; no filler.

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 usefully enumerates the returned fields, and the single parameter is fully covered, so an agent has what it needs to call the tool. The main omission is error/not-found behavior for a lookup that accepts four different input shapes.

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 already lists the accepted forms (name, synonym, slug, PTL identifier); the description largely repeats this. The two concrete examples ('react', 'PTL-0058') add a little formatting guidance, but nothing beyond the schema's own enumeration. 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?

States a specific verb and resource ('Get the full Protologue entry for one technique') and enumerates the returned content, so the agent knows exactly what it retrieves. It does not name or contrast itself with the obvious sibling search_terms, which is the only thing keeping 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?

The 'one technique' framing and the accepted identifier forms imply usage (retrieve a single known term), but there is no explicit 'use this when...' or a pointer to search_terms for discovery. Usage is inferred rather than stated.

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