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

Annotations already declare readOnlyHint=false, openWorldHint=true, idempotentHint=true, and destructiveHint=true, so the safety profile is largely covered. The description usefully scopes that destructive behavior by ruling out block deletion and media upload, and clarifies block identity semantics. However, it never mentions that null values clear existing fields (the actual source of the destructive hint) or that this is a partial update where omitted fields are untouched, both important 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 short sentences, front-loaded with the core action and followed by the block-identity rule and the scope exclusions. Dense and low-waste, though the phrase 'or safe link' is awkward and slightly muddies an otherwise clean opening sentence.

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, so return values need no explanation, and the rich annotations carry the safety profile. The description covers the main surfaces (profile, social, blocks) at a level sufficient to call the tool. The remaining gap is that it does not state the partial-update contract (only supplied fields change; nulls clear), which matters given 10 optional parameters and destructiveHint=true.

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 parameter is documented in the schema, which sets the baseline at 3. The description's id/client_id block rule duplicates the schema's own blocks description almost verbatim, adding no new semantics. Fields like theme, shape, slug, bio, and location are neither named nor explained in the description.

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 (Edit) and resource (the authenticated creator's link-in-bio profile, social profiles, and block types), so an agent knows what it mutates. It partially separates itself from siblings by declaring it does not delete blocks, which routes away from link_in_bio_remove_block. It never names link_in_bio_upsert_block, which is the closest overlapping sibling for block edits, so differentiation is incomplete.

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 clear when-not guidance: 'does not delete blocks or upload media,' which tells the agent to reach for a different tool for those operations. It also gives the id vs client_id rule for choosing update vs insert of a block. It stops short of naming the actual alternative tools (link_in_bio_remove_block, link_in_bio_upsert_block), leaving that inference to the agent.

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