Writefile

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

No annotations are provided, so the description carries the full behavioral burden, and it discloses almost nothing: it does not say whether existing files are truncated, whether missing files are created, whether parent directories are made, or what happens on permission errors. For a mutation tool that can silently destroy existing content, this is a substantial gap.

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 nine-word sentence with zero padding and the resource/scope stated up front. It is efficient, though its brevity contributes to the transparency gaps noted above rather than being a pure strength.

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 need not be explained, but the definition still omits the destructive/overwrite behavior, file-creation semantics, and any routing versus sibling write tools. For a 4-parameter mutation tool with no annotations, that leaves an agent under-informed before calling it.

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 all four parameters (including append and newline) are already documented in the schema. The description adds no parameter-level detail beyond reiterating the file/text targets, so the baseline 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?

States a specific verb (write) and resource (text into a local file) plus a scope constraint (current directory), so the agent knows it cannot target arbitrary paths. It does not, however, distinguish itself from write-capable siblings like editFile or applyPatch, which also modify file contents.

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 mention of when to prefer editFile/applyPatch over a full-file write, and no statement of prerequisites or overwrite semantics. The agent must infer that this replaces file contents rather than editing them.

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