generate_image

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

With no annotations provided, the description carries the burden of disclosing safety and side effects. It does disclose side effects (preserving response, saving files to disk, returning MCP content). However, it does not reveal potential write/modification behavior, provider-specific limitations, or error-prone conditions like overwriting files or moderation implications.

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 sentence that is reasonably concise and front-loaded with the main action. It covers multiple behaviors compactly. It could be slightly more structured (e.g., split into purpose and usage), but it earns its place without padding.

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 18 parameters, no output schema, and no annotations, the description is underspecified for full autonomous use. It clarifies the file-saving and response-preservation behaviors but does not explain the full output contract, provider coordination, or parameter interactions, making it adequate but with clear 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 description coverage is low (22%), so the description partially compensates by clarifying key behavior around save_directory and response preservation. It adds meaning beyond the schema for the main flow, especially the user-selected directory semantics, but leaves many parameters unexplained (e.g., background, moderation, stream, custom_parameters).

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 uses specific verbs ('Generate', 'preserve', 'save', 'return') and identifies the core resource (image) and key behaviors (file saving, MCP content return). It is clear enough to distinguish from siblings like list_image_providers or get_image_capabilities, though it doesn't explicitly name those alternatives.

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 the tool is the main generation action, and mentions preserving URL/b64_json response and saving to a user-selected directory, which signals when file persistence is involved. However, it does not provide explicit when-to-use vs. alternatives, prerequisites (e.g., provider selection via prepare_image_request), or exclusions.

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