url_encode_decode

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 does not mention whether the operation is read-only, what side effects might occur, what output format to expect, or any operational constraints. The only behavioral trait mentioned is the cost, which is not a behavioral aspect.

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 very short (two phrases) but the first phrase simply repeats the tool name, and the second phrase about cost does not contribute to understanding the tool's usage. It is concise in length but fails to earn its place by adding meaningful content.

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 tool that requires at least a URL string and an action (encode/decode), the description is severely incomplete. There is no output schema, no parameter details, and no explanation of how to specify the mode. The description is inadequate for an agent to successfully invoke the tool.

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 contains a single generic 'params' object with no specific properties, and the description provides no information about what parameters are required (e.g., 'url', 'action'). The description adds zero value beyond the schema, leaving the agent with no guidance on how to construct a valid request.

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 restates the tool name ('url encode decode') and adds a category label ('Text & Encoding tool'), but does not explain what the tool does in a functional sentence. It is clear that it relates to URL encoding/decoding, but it does not distinguish this tool from sibling encoding tools like encode_base64 or html_escape.

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 usage guidance is provided. The description only mentions a cost ('Costs $0.001 USDC via x402') without any indication of when to use this tool versus alternatives, prerequisites, or scenarios where it is appropriate.

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