find_by_placeholder

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states that it returns a ref and match count, but does not clarify whether the operation is read-only, how matching works (exact, partial, case-sensitive), or what happens when no matches or multiple matches are found.

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?

The description is a single streamlined sentence that front-loads the purpose and then specifies the return value. There is no filler, repetition, or unnecessary detail.

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 simple two-parameter lookup tool, the description covers the core function and return shape adequately, and the schema handles the within parameter. However, with no output schema and no annotation coverage, missing details such as no-match behavior and matching semantics leave minor but real gaps.

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 50%, with placeholder lacking a schema description and within having one. The description partially compensates for placeholder by identifying it as the search text, but adds no detail about matching behavior or formatting. The within parameter is already covered by the schema.

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 clearly states a specific action ('Find input by placeholder text') and resource, and briefly mentions the return value. It does not explicitly distinguish itself from sibling tools like find_by_text or find_by_label, but the placeholder-specific focus makes the purpose reasonably clear.

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 guidance on when to use this tool versus alternatives such as find_by_text or find_by_label. The description implies it is for locating inputs via placeholder text, but it provides no exclusions, prerequisites, or alternative routing.

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