Render PlantUML diagram

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

With no annotations, the description carries the full behavioral burden and discloses key traits: PNG is returned inline, SVG/TXT are returned as text, output can be saved to a path, and syntax errors are reported with the offending line. It does not mention rate limits, permissions, or whether saving overwrites an existing file, but covers the primary behaviors well.

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 front-loaded with the core action, then efficiently layers in output behavior, saving, and error reporting. Every sentence adds useful information without redundancy.

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 no annotations and no output schema, the description must explain return behavior and error handling. It does so clearly: inline image vs text output, optional file save, and syntax error reporting. An agent has what it needs to invoke the tool correctly.

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 baseline is 3. The description adds meaning beyond the schema by clarifying that PNG is returned inline for inspection while SVG/TXT are returned as text, and that output_path is an optional save location. It adds behavioral context to the format enum rather than just restating it.

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?

States a specific verb ('Renders') and resource ('PlantUML code') and enumerates supported diagram types and output modes. However, it does not explicitly distinguish itself from the sibling tools (get_diagram_urls, decode_diagram_url), so the differentiation remains implicit.

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 description implies usage ('Renders PlantUML code') and gives a condition for optional saving ('Optionally saves the result to output_path'), but provides no explicit when-to-use guidance or alternatives to the sibling tools. Usage is inferable but not directed.

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