append_to_file

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 mentions the append and create-on-missing behavior, which is helpful, but it does not disclose permissions required, failure modes, whether content is inserted at the end, or what the response looks like. For a mutation tool, this is insufficient transparency.

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, front-loaded sentence that states the core action and the most important conditional behavior. Every word earns its place, with no redundancy or filler.

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 tool's simplicity (2 params, no output schema), the description covers the essential action but leaves gaps in usage guidance and behavioral detail. The lack of annotations and absence of return-value information mean the description could be more complete in guiding an agent, especially with sibling tools available.

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 description coverage is 100%, so both parameters are fully described in the input schema. The description adds no additional parameter-level meaning beyond what the schema already provides. The create-if-missing note indirectly relates to the filename behavior, but this is not a significant enhancement over the schema.

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 action (append) and resource (file), and adds the key behavior of creating the file if it does not exist. While it does not explicitly differentiate from sibling tools like append_to_active_file, the phrase 'to a file' and the create-if-missing note provide enough specificity for basic selection.

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 when to use the tool (when you want to append content to a specific file, possibly creating it), but it does not provide explicit context about when to prefer this over alternatives like append_to_active_file or create_or_update_file. No exclusions or alternative recommendations are given.

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