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

Despite annotations already covering readOnly/destructive/openWorld, the description adds substantial behavior: visibility to anyone with the portal link, attribution under the studio name rather than the user, side effect of marking client comments read, no email, and the confirm-gated preview. This is exactly the extra context annotations cannot convey.

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?

Telegraphic but front-loaded and free of filler; each sentence carries a distinct fact (visibility, non-email, length, portal existence, owner restriction, confirm). The clipped style is dense rather than padded.

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?

For a confirm-gated mutation tool with full schema coverage and annotations, the description covers prerequisites, side effects, and the preview behavior. Nothing an agent needs to call it safely is missing.

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 coverage is 100%, so cardId, text, and confirm are already documented, and the description largely restates the 2000-character limit and confirm:true semantics. Baseline 3 is appropriate since 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?

States a specific verb (posts) and resource (answer under a task on the client portal) with scope. It clearly distinguishes itself from sibling comment tools by specifying the client-facing portal, studio-name attribution, and that it is not emailed.

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 preconditions and context: portal must exist, only the project owner, and confirm:true is required. It stops short of naming an explicit alternative (e.g. add_comment for internal replies vs reply_to_client), so the when-to-use routing is implied rather than spelled out.

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