File I/O

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

No annotations are provided, so the description carries the full burden. 'Low-level' hints at statefulness and handle-based semantics, but it never states whether open file handles must be tracked across calls, whether write operations truncate or append, whether overwriting existing files destroys data, or what errors look like.

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?

One front-loaded sentence with no filler, but the brevity is under-specification rather than efficiency for a seven-action, seven-parameter tool. Nothing is padded, yet nothing is prioritized either.

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?

An output schema exists so return values needn't be described, but for a branching low-level I/O tool with no annotations and one required enum action, the description leaves the action-parameter pairings and I/O state model entirely unexplained.

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 the baseline is 3. The description adds nothing about parameters, and the key gap it should have filled — which of the seven optional parameters apply to each of the seven actions — remains unaddressed.

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 names a resource (files) and a class of operations (open/close/write), so the general purpose is inferable. But it is vague about scope and never distinguishes this low-level helper from siblings like load_data/save_data, nor does it cover the action enum values write, writem, writeascii, spwrite that dominate the schema.

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?

There is no statement of when to reach for file_io versus the sibling tools, especially load_data/save_data which sound like the higher-level equivalents. No prerequisites, no exclusions, and no mention that fopen must precede fwrite/close.

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