set_fit_download_dir

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

With no annotations, the description carries the full burden of explaining side effects. It clearly states that the tool stores the path in a JSON config file and affects future downloads, which is transparent about persistence behavior. It does not mention potential overwrite or error behavior, but those are not critical for this simple setter.

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 concise and well-structured, with a clear purpose statement followed by implementation detail and parameter guidance. Every sentence adds useful information without redundancy.

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 state-setting tool, the description provides all necessary context: what it does, where it persists, and how it affects another tool. No return schema details are needed for this action, and the description is sufficient for an agent to invoke it 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?

Although the schema provides no field description, the tool description fully covers the only parameter ('path') by explaining that it is a directory and offering recommended usage. This gives the agent complete semantic understanding of the argument.

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 uses a specific verb ('set and persist') and clearly identifies the resource ('default directory for downloaded activity files'). It is distinct from sibling tools, which mostly retrieve data, and it explicitly names the dependent tool download_activity_file.

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 explains that this tool persists the directory so download_activity_file can save files without asking, giving clear context for when to use it. It also provides practical guidance to pass the current working directory, though it could be more explicit about sequencing relative to download_activity_file.

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