append_content

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

With no annotations, the description carries the disclosure burden. It clearly states the mutating action ('append') and the non-destructive create-if-missing behavior, which is valuable context. However, it does not mention return values, permissions, or directory creation, leaving some gaps for a write tool.

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?

Two compact sentences with no filler. The primary action is front-loaded, and the edge-case behavior (creating missing files) is added efficiently. Every word earns its place.

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?

The tool is simple, and the schema covers parameters fully. The description explains the core behavior and an important edge case, which is sufficient for correct invocation. Given no output schema or annotations, a bit more detail on return values could improve it, but it is largely complete.

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 coverage is 100% with all three parameters well-documented. The description adds no additional meaning beyond the schema; it merely restates the append action. Baseline 3 applies because the schema does the heavy lifting.

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?

Description uses the specific verb 'append' and resource 'file', clearly distinguishing it from siblings like put_content (which likely overwrites). The additional clause 'Creates the file if it does not exist' clarifies behavior, making the purpose unambiguous.

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 append semantics imply when to use the tool (add content to a file, create if missing), but there is no explicit comparison to put_content or other alternatives. No exclusions or when-not scenarios are stated, so guidance is only implied.

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