save_url

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

With no annotations, the description carries full burden for behavioral disclosure. It states 'save for archival' and lists supported features, but does not mention side effects (e.g., API credit usage, potential duplicates), rate limits beyond env var hint, or what happens if the URL is already archived. This is insufficient for a mutation tool.

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: first states core action, second lists optional features, third provides setup tip. No redundant information; efficient and front-loaded.

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?

With 7 parameters, all well-described in schema, and a clear core action, the description is largely complete. However, it lacks explanation of return values or confirmation behavior (no output schema), and misses context on error handling or archival status response. This leaves gaps for an external API 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?

Schema description coverage is 100%, so all parameters are already documented in the schema. The description adds no further clarifications for individual parameters beyond their schema descriptions. Baseline 3 is appropriate as the schema does the heavy lifting.

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 verb 'Save a URL to the Wayback Machine for archival' and specifies key features (screenshots, outlinks, conditional archiving). It effectively distinguishes this tool from siblings like check_archive_status or get_archived_url by focusing on the archival action.

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 mentions setting environment variables for higher rate limits but provides no explicit guidance on when to use this tool versus alternatives, nor any 'when not to use' context. Sibling tools have distinct purposes, but the description does not clarify prerequisites or exclusions.

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