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

Annotations already provide readOnlyHint=false and idempotentHint=true, so the description does not need to restate idempotency. It adds the detail that repeated calls return the existing bookmark, which is useful, but not much additional behavioral context beyond what annotations already supply.

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 short sentences, front-loaded with the primary action and immediately followed by the key idempotency caveat. Every sentence earns its place with no filler or 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?

The tool is simple: one required parameter and an output schema is present, so return-value documentation is not needed. The description covers the essential behavior for correct invocation: save a public URL and idempotent repeated calls. It only lacks explicit sibling routing or edge-case guidance, which is a minor gap.

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 0%, so the description must carry parameter meaning beyond the schema. It adds the semantic constraint that the URL must be 'public' and notes that the same URL is the identity key for idempotency, which meaningfully supplements the schema's url property.

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 action ('Save'), the resource ('a public URL'), and destination ('Stashr'), and adds the behavioral result of repeated calls. However, it does not explicitly distinguish itself from siblings like update_bookmark or archive_bookmarks, so it is clear but not fully differentiated.

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 gives a clear context: saving a public URL and idempotent behavior. It does not mention when not to use this tool versus alternatives or provide any routing guidance relative to siblings, so usage context is implied rather than explicit.

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