add_photo

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

No annotations are provided, so the description must fully disclose behavioral traits. It only says 'save' indicating a write operation, but does not mention permissions, idempotency, potential overwriting, or whether the date must already exist. This is insufficient for an unannotated mutation tool.

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 sentence of 16 words, efficiently conveying the core action. It could benefit from slightly more structure but is appropriately sized.

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?

With 5 parameters, no output schema, and low schema coverage, the description falls short. It does not explain how to specify the photo (data vs path), the role of 'filename', or what the tool returns. A more complete description is needed for effective invocation.

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 only 20% (only 'date' has a description). The description adds value by explaining 'data' and 'path' are for local path or base64 input, and that 'caption' is optional. However, it does not clarify the relationship between 'data' and 'path' (e.g., are they alternatives?), nor the purpose of 'filename'.

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 verb 'save' and resource 'photo into the user's diary for a day', specifying two possible input formats (local path or base64) and an optional caption. This effectively distinguishes it from sibling tools like add_entry and add_voice_note.

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 implies the tool is for adding a photo to a diary entry, providing some context on when to use it. However, it lacks explicit guidance on when not to use it or alternatives, leaving the agent to infer from context.

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