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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false, so the safety profile is covered. The description adds non-annotation behavior: the prerequisite ordering, that everything arrives in ONE call, and that it removes the need to brute-force enum spellings. It does not mention auth or rate limits, but for a schema-fetch tool that is minor.

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?

Front-loaded with the imperative 'Call this FIRST', which is exactly what an agent needs to see first. It is dense but the parenthetical icon enumerations (linkedin -> linkedin-in, etc.) are repetitive; a couple of examples would have carried the same signal with less bulk.

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-value structure need not be re-explained, and the description still gives the shape of what comes back (schema + enums + example + guidance). Together with annotations this is fully sufficient for an agent to call the tool correctly and know why.

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?

There is a single parameter (context) with 100% schema description coverage, so the schema already explains its purpose and constraints. The description adds no parameter-level detail beyond that, which is the expected baseline when 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 names a specific verb+resource (returns the content schema needed to build a valid block tree) and enumerates exactly what is returned: strict JSON Schema, enums lookup, social_icons map, worked example, and guidance. It is unmistakably distinct from siblings like get_signature_html or preview_signature.

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?

It states an explicit call-order rule ('Call this FIRST before authoring or editing') and names the exact downstream tools it enables: create_signature / update_signature drafts and marketing-campaign content. When-to-use is spelled out rather than inferred.

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