Adds a file extension to the specified preset.

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

Annotations already declare a non-read-only, non-idempotent, non-destructive, closed-world mutation, so the safety profile is covered. The description adds nothing beyond that: it doesn't say whether an existing extension with the same ID is replaced, whether the file must exist on disk, what errors occur on failure, or what permissions are needed. For a write tool it carries no extra behavioral context.

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?

It is a single front-loaded sentence with no wasted words, which is structurally fine. But the sentence merely mirrors the title, so its brevity reflects under-specification rather than efficient communication.

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 mutation tool with no output schema, the description should at least note that only presetId is required and filePath is optional, and what happens to pre-existing extensions. None of that is present, and the description never mentions the file input at all despite 'from_file' in the name.

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%: filePath, presetId, and workspaceId all carry inline descriptions and the workspaceId default (-1) is documented. The description adds no formatting or constraint detail beyond the schema, so the baseline of 3 applies.

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?

Tautological: description restates name/title.

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, no prerequisites, and no mention of create_extension_from_web as the alternative for web-sourced extensions. Usage is only weakly inferable from the phrase 'file extension', so this is essentially 'no guidance'.

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