Add plan attachment

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

No annotations are provided, so the description must carry the full burden of behavioral disclosure. It only states the action and input format, but does not mention potential side effects, required permissions, size limits, or response behavior. For a mutating upload operation, this is a notable gap.

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 immediately conveys the core function. The first sentence ('TestPlan.add_attachment.') is redundant with the tool name, but the second sentence is efficient and informative. Overall, it is reasonably concise with 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?

For a simple upload tool, the description and rich schema cover the essential details: what is uploaded, in what format, and to what target. No output schema is present, but the tool's behavior is straightforward enough that this does not severely hamper usability. A small amount of additional context about side effects or return values would improve it.

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% with each parameter already described (plan_id, filename, b64content). The description's mention of 'filename + base64 content' mirrors the schema, adding little new meaning. The baseline of 3 applies because the schema is fully self-explanatory.

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's function with a specific verb ('Uploads') and resource ('the plan'), and explicitly names the payload (filename + base64 content). It differentiates this from sibling attachment tools by scoping to 'plan', matching the tool name.

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 guidance is provided about when to use this tool versus alternatives like case_add_attachment or run_add_attachment. The context signals list many sibling attachment tools, but the description does not explain when this one is appropriate.

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