url_encode

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It only states the basic operation without detailing character encoding rules, handling of special characters, or return format. No behavioral nuances are revealed beyond what the schema already conveys.

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 a single compact sentence that communicates the core function without any redundant words. It is appropriately sized for such a straightforward utility.

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?

The tool is simple, but the lack of an output schema means the return format is not explicitly stated. The description implies the output is the encoded/decoded string, but it does not mention default behavior (defaults to encode) or potential error conditions. It is adequate for a minimal tool but not fully 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 input schema has 100% coverage for both parameters ('text' and 'action'), so the description need not elaborate. The description adds no extra meaning beyond the schema, but does not need to given the high schema coverage.

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 specifically names the resource ('URL') and the action ('encode or decode'), which clearly distinguishes it from sibling tools like base64 or hex_encode. The phrase 'URL encode or decode a string' is specific and unambiguous.

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?

No explicit guidance is given for when to use this tool versus alternatives like base64 or string_escape. The description does not mention excluded use cases or prerequisites.

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