Open in TruePath PDF (Mac app)

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

With no annotations provided, the description discloses key behaviors: fire-and-forget, requires app installation, and links to download. However, it does not specify error handling (e.g., if app is missing or path invalid) or whether the function returns any status. This leaves some behavioral transparency gaps.

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 two sentences, efficiently front-loading the purpose. Every sentence adds value: first sentence gives action and use case, second explains mechanism and requirement. No extraneous words.

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 no output schema, the description explains the fire-and-forget nature and app requirement. It lacks explicit error handling or return value details, but for a simple open-in-app tool, the context is fairly complete for an agent to use correctly.

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 coverage is 100%, so baseline is 3. The description adds meaning for the 'scheme' parameter by explaining its default and when to override it (re-branded builds), which goes beyond the schema's description. The 'path' parameter is similarly clarified as absolute path.

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 the tool hands a local PDF to the TruePath PDF Mac app via URL scheme, with a specific verb 'hand' and resource 'local PDF'. It distinguishes itself from sibling tools like extract_images, merge, etc., which serve different purposes.

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 provides clear context: use when the user needs GUI-based work on a PDF (annotate, sign, fill forms, redact) and notes it's fire-and-forget. However, it lacks explicit when-not-to-use instructions or alternatives, though the context is sufficient for an agent.

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