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

Annotations declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds that output is built only from guide data and includes guide_url, but doesn't disclose rate limits, auth, or other behavioral traits beyond the annotations.

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?

Front-loaded with usage triggers, then a compact list of outputs. The trailing semicolon is odd but minor; the description is appropriately sized.

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 read-only comparison tool with no output schema, the description explains the output structure (specs table, fit notes, summary) and data source, making it complete enough to call correctly. It doesn't cover edge cases but none are critical.

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 parameters are fully documented. The description adds that ids should come from search_home_gym_gear, which is useful provenance, but doesn't add meaning for user_height_in beyond the schema.

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?

Description states the tool places 2-3 products side by side with a specs table, fit notes, and summary, which is a specific comparison action. It references search_home_gym_gear for ids but doesn't explicitly contrast with other siblings like get_home_gym_gear or find_home_gym_gear_alternatives.

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?

Explicit trigger phrases ('A or B?', 'what's the difference', 'which fits my room better') tell the agent exactly when to use it. It also notes ids come from search_home_gym_gear, implying a prerequisite, but doesn't state when not to use or name alternative tools.

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