set_url_rewrite_rules_tool

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

No annotations are provided, so the description must disclose behavioral traits. It clearly states that calling this replaces all existing rules, which is a critical destructive behavior. It also gives the rule structure, but doesn't mention side effects beyond replacement.

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 description is short and front-loaded with the key point about replacing existing rules. It uses a bulleted sub-list for rule structure, which is concise and easy to parse. No fluff.

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?

Given that this is a setter tool with an output schema (not shown), the description covers the main behavior and parameter structure. It doesn't explain error cases or idempotency, but for the complexity level, it's fairly complete.

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?

The schema already describes zone_id and rules, so baseline is 3. The description adds significant value by detailing the required fields within each rule (expression, description, action, action_parameters) and giving a sample structure for action_parameters. This goes 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?

The description clearly states it sets URL rewrite rules and explicitly notes it replaces all existing rules. This distinguishes it from sibling tools like list_url_rewrite_rules_tool and set_request_header_rules_tool.

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 description explicitly states 'replaces all existing rules', which tells the agent this is a full replacement operation and should be used when defining the entire rule set. It doesn't explicitly mention alternatives, but the context is clear.

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