pack_resources

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

With no annotations, the description carries the burden and does reasonably well: it discloses the mutation's effect (external assets are absorbed into the .blend), the resulting property (self-containment/portability), and the persistent side effect of autopack on every save. It doesn't mention file-size growth, failures from missing paths, or reversibility via unpacking.

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?

Two-sentence summary is front-loaded with the action and the benefit, and the Args block is tight. The Returns block restates what the output schema already provides, which is mild waste rather than bloat.

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 single-optional-boolean mutation tool with an output schema present, the description covers purpose, effect, portability rationale, autopack semantics and return shape. An agent has everything needed to decide to call it and how to set the flag.

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 coverage is 0% and the single undocumented parameter is fully explained in prose: autopack means new external files are packed automatically on every future save. That is genuine meaning beyond the schema's bare boolean, though its interaction with already-packed items isn't clarified.

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 (pack) and enumerates the exact resource classes affected (image, sound, font, volume) plus the destination (.blend file), which separates it cleanly from siblings like unpack_resources, manage_external_paths and link_or_append.

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?

Gives a concrete use condition — making the file self-contained so it can be moved or shared without missing textures. It does not name the counterpart tool (unpack_resources) or state when packing is undesirable (e.g. file-size concerns), so it stops short of full alternative routing.

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