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

With no annotations, the description carries the full burden. It does disclose meaningful traits: the facts are 'reviewed' (curated content), sources are attached, and no verdict or ranking is produced. It says nothing about behavior for unknown or unmatched options, about the scope limit of exactly two items, or about result shape, so the disclosure is useful but partial.

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 short sentences, front-loaded with the operation and closed with the key negative constraint. Nothing is redundant and every clause carries information.

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 three-parameter, read-only comparison tool with no output schema, the description covers the core intent and the sources/no-verdict behavior. It is thinner on what the caller gets back structurally and on the optional topic filter, which an agent must learn from the schema alone.

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% with an enum on topic, so the schema already does the heavy lifting and baseline 3 applies. The description does add a little meaning by restricting 'first'/'second' to activities, walks, or places rather than arbitrary strings. The optional topic parameter is never mentioned in the description, so no extra guidance on topic selection is gained there.

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 concrete operation on a concrete resource: putting reviewed facts on two activities, walks, or places side by side, with sources. The closing clause 'offers no ranking or verdict' separates it from a recommendation-style tool and hints at what siblings like get_answer or plan_trip do instead. It stops short of a crisp verb-resource phrasing, which keeps it out of the top band.

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 comparison framing implies when to reach for it, and 'offers no ranking or verdict' sets a boundary on what it will return. However, it never states an explicit trigger ('use when choosing between two candidates') nor names an alternative such as calling get_experience twice for each option. Usage is inferable but not spelled out.

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