Render one diagram

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

Discloses output as file path and 2x rendering for crisp output. However, with no annotations, more information would be beneficial, such as whether it overwrites existing files, idempotency, or required permissions. Still, key behaviors are covered.

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 concise sentences with no redundancy. First sentence states purpose, second explains inputs, third describes output and quality. Every sentence adds value.

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?

Given 3 parameters, no output schema, and no annotations, the description is fairly complete. It covers input requirements, output format, and quality hint. Could mention the output path format or directory confinement, but overall adequate for the tool complexity.

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 has 33% coverage; the description compensates by referencing list_templates for slot schema and explaining that slots are validated there. However, it does not detail the structure of slots or add meaning beyond the schema for out_path. Adequate but not excellent.

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?

Clearly states it renders a single in-article diagram to PNG. Distinguishes from sibling tools like render_set (multiple) and render_cover (cover image) by specifying 'single' and 'in-article'.

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?

Instructs to provide template name and slots, and references list_templates for slot schema, providing clear context. Does not explicitly state when not to use, but the purpose is well-defined and alternatives are implied by sibling names.

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