writeToFile

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

With no annotations, the description carries the full burden, and it does add one genuine behavioral fact: writes are atomic. However it omits permission requirements, directory-creation behavior, error/failure semantics, and the precedence rule between append and overwrite, which are the traits an agent most needs for a destructive mutation.

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?

A single front-loaded sentence with zero filler, and the create-vs-modify distinction leads. It is arguably too terse for a five-parameter mutation tool, but nothing in it is wasted.

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 5-parameter, no-annotation, no-output-schema mutation tool, the description leaves too much unspecified: flag interaction, behavior when the target does not exist and append is set, and failure behavior. The atomicity note is the only added behavior.

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 schema already documents all five parameters and the baseline is 3. The description ties 'atomic overwrite/append' to the two boolean flags, but adds no precedence or conflict semantics beyond the terse schema prose.

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 specific verb+resource ('Create a new file or ... overwrite/append to an existing file') and even discloses the atomic write behavior. It is clear in isolation, but it never differentiates itself from the sibling replaceFileContent, so an agent can't tell from the description alone which mutation path to pick.

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 when-to-use guidance and no mention of the alternatives viewFile or replaceFileContent. The description also never explains how the append and overwrite flags interact or what happens when both are false, leaving the selection logic entirely to inference.

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