download_modpack

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

The description discloses the download destination, SHA-1 verification, default version behavior, and the return object structure. However, it does not mention permission requirements, overwrite behavior, or any side effects beyond writing to <workdir>/mcpacks/. With no annotations, these traits are not covered elsewhere.

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 sentences contain destination, verification, parameter usage, and return format, with no superfluous information.

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?

Considering the tool has 3 parameters and no output schema, the description covers the primary action, a key behavioral detail (SHA-1), default version selection, and the full return object structure. It misses explanations for id and source, but overall is sufficiently complete for a download tool.

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?

The description clarifies the versionId parameter and its default behavior, and references get_modpack as the source of version names. It does not explain the id parameter (likely the modpack identifier) or the source parameter, though the enum values are self-explanatory. With 0% schema coverage, this is partial compensation.

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 clearly states the tool downloads a modpack file via HMCL to a specific directory, with specific behavior (SHA-1 verification). This distinguishes it from sibling tools like install_modpack, which presumably installs the modpack.

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 through the versionId parameter ('a version name from get_modpack') and defaulting to latest, but offers no explicit guidance on when to choose this over install_modpack or other siblings. It provides context but no when-not/alternatives.

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