joist_type

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

No annotations are provided, so the description must cover behavior itself, and a single sentence does not say whether existing text in the field is replaced or appended to, whether a submit or blur event fires, or whether the target field must be focused first. These are material gaps for a write-to-page tool. The schema's note that the element number comes from a prior read hints at ordering, but that note is in the schema rather than in the description.

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 zero filler and no ambiguity in phrasing. It is arguably too terse for a write operation, but the issue is under-specification rather than wasted words.

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?

With only two required parameters and no output schema, this tool is simple enough that a brief description covers most of the need. However, for a mutating tool with no annotations, the description should still state replace-vs-append semantics and the dependency on a prior read, so it falls short of 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 description coverage is 100%, so both parameters are already fully documented in the schema, and the description adds no new syntax, format, or constraint information. A baseline 3 is appropriate 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?

The description gives a specific verb and resource combination ('Type text into a numbered field'), which clearly separates typing from the click, read, and open operations of its listed siblings. It stops short of naming an explicit alternative or scope qualifier, so a 4 rather than a 5 fits.

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 phrase 'on the current Joist page' implies that this tool is limited to the currently loaded page, but the description never states when to call this tool instead of joist_click or joist_read. It also omits the prerequisite that a field number must come from a prior read; the schema carries that prerequisite instead.

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