osint_isbn_validator

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

No annotations are provided, so the description carries the full burden. It discloses core behaviors (validation, conversion, analysis, error reporting) but lacks specifics on side effects, permissions, or rate limits. Adequate but not detailed.

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?

Two sentences efficiently describe purpose and direct to fuller guidance. No wasted words, but relies on external describe_tool for complete information.

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 the lack of parameter definitions and output schema, the description is insufficient. It does not specify input format, required fields, or return structure, leaving the agent guessing how to invoke it. Referral to another tool does not fully compensate.

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 is open (type: object, additionalProperties: true) and the description adds no parameter information. With 0 parameters defined and 0% parameter documentation in the schema, the agent has no guidance on what input to provide. Description fails to compensate.

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 validates ISBN-10 and ISBN-13, checks format, calculates check digits, converts formats, and provides detailed analysis and error reporting. This is specific and distinguishes it from sibling validation tools like credit card or EAN validators.

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 only instructs to 'Use describe_tool with tool_id "isbn_validator" for full page guidance' but provides no explicit guidance on when to use this tool vs alternatives or any context on prerequisites or limitations.

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