render

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

With no annotations, the description carries the full burden. It usefully discloses side effects (writes OUT.svg, OUT.html, and a receipt) and a failure mode (ok false indicates read errors), but says nothing about overwriting existing files, permissions, or the precedence between inline spec/data and path.

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?

Three short, front-loaded sentences with no padding; outputs are named early. The telegraphic 'ok false' phrasing is terse to the point of being cryptic, costing a little clarity.

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 6-param tool with nested objects and no output schema, the description covers the write side effects and a failure signal, which is the right scope. It still omits how the 'ok'/receipt is surfaced to the caller and how spec vs path precedence works, leaving gaps an agent would hit.

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 the schema already documents all six parameters, including the 'type' enum values and options shape. The description adds no parameter meaning beyond mentioning 'spec or options' in its error note, 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?

The description states concrete actions (validate, draw, audit) and names the concrete artifacts produced (OUT.svg, OUT.html, a receipt), so an agent knows this renders a figure to disk. However it gives no differentiation from the siblings validate and audit, which it claims to also perform, leaving overlap unresolved.

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 a hint of recovery guidance ('ok false: ... call again'), but nothing states when to use render versus describe, export, validate, or audit. An agent gets no routing signal for choosing this tool over its siblings.

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