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

Annotations already flag destructiveHint=true and readOnlyHint=false, so the agent knows this mutates state; the description adds valuable format constraints (max 3 lines, 120 characters, plain hyphen not an em dash) and placeholder semantics. However, it never discloses that applying a sign-off overwrites any existing one, nor anything about brand scoping or authorization, which is the key destructive behavior an agent should surface.

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?

One dense sentence that front-loads the behavior and then packs the format rules into the same breath; no filler. Only slight cost is that it opens with a conditional ("When on") rather than the action, but nothing is wasted.

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 destructive, open-world mutation with no output schema, the definition covers the format contract but leaves out what happens on turn-off, whether an existing sign-off is replaced, and what the caller should expect back. It is adequate to call correctly but incomplete about consequences.

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 only 33%, but the description compensates well: it explains the default `format` value "- {name}", the {name}→first-name substitution, and the length/dash constraints. `brand` is documented in the schema itself and `on` is a self-evident boolean, so the gap is small.

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 states the effect precisely: when on, every team reply from the Team Inbox ends with this sign-off, with {name} substituted by the sender's first name. Combined with the title, the resource and effect are unmistakable and distinct from siblings like set_tone or set_topics, though the description itself never says "set" or names those siblings.

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?

There is no statement of when to use this versus adjacent configuration tools (set_tone, set_topics, update_settings), no mention of prerequisites or permissions, and no guidance on the off case or on replacing an existing sign-off. The reader must infer usage entirely from the title.

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