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

Annotations already declare the full safety profile (readOnlyHint=false, idempotentHint=true, destructiveHint=true, openWorldHint=true), so the bar is lower. The description adds the no-file-upload boundary and the create-or-edit semantics, but does not explain what 'destructive' means here (e.g., overwriting existing block fields) or any permission requirements.

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 sentences, all front-loaded: purpose first, key constraint second, and a docs link for the bulky block-type/limit reference rather than inlining it. Every sentence earns its place.

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?

An output schema exists (return-value detail needn't be in the description), annotations cover safety, and the schema covers all parameters. The description adds the essential no-upload boundary and defers limits to documentation, leaving only minor gaps around destructive semantics and auth requirements.

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 every one of the 11 parameters (including url, block_id, client_id, and block type enum) is already documented in the schema. The description adds no syntax, format, or default semantics beyond what the schema provides, making the baseline 3 appropriate.

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 pair (create or edit / upsert) and resource (one owned link-in-bio block), and enumerates exactly which block types are covered (link, title, text, image, video, download). This clearly distinguishes it from siblings like link_in_bio_remove_block, link_in_bio_get, and link_in_bio_update.

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?

Provides a useful constraint for image/video/download blocks (public HTTPS URL, no file upload), implying when the tool is appropriate. However, it never states when to prefer this upsert over link_in_bio_update or link_in_bio_create, and no explicit exclusion or alternative is named, leaving usage to inference.

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