Get one rule by id

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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered. The description adds useful content about what the record carries (source, quote, confidence, verified date, freshness, citation line), but says nothing about behavior on a missing/unknown id or any lookup limits. With annotations carrying the safety burden, this is adequate but not rich.

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?

Purpose is front-loaded in the first clause, and the id-format note is a legitimate second sentence rather than filler. The middle list of returned fields is somewhat dense and partly duplicates the output schema, but each element is informative.

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 simple read-by-id tool with a full output schema and complete parameter coverage, the description supplies everything an agent needs: what it returns, what the id looks like, and where ids come from. The only gap is behavior on an unknown id, which is a minor omission given the output schema handles the return 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 description coverage is 100%, so both parameters are already documented, and the schema itself supplies a concrete id example. The description adds marginal value by explaining the id pattern 'rul_<place uid>_<kind>' and its origin in place results, but gives no guidance on response_format beyond what the enum already conveys.

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 (fetch one rule by stable id) and immediately disambiguates what a 'rule' is with concrete examples (fee, leash rule, weight limit). This clearly separates it from sibling tools like dogpolicies_get_place, which returns a whole place rather than a single rule.

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?

Usage is implied rather than stated: the note that rule ids 'appear in every place result as rule_records' tells the agent where to get an id, which implies the get_place -> get_rule workflow. However, it never explicitly says when to use this instead of get_place or get_brand_policy, and gives no exclusions or error conditions.

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