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

Annotations already establish this is a non-read-only, non-idempotent, non-destructive, open-world write, so the description only needs to add what those flags cannot say. It adds nothing: whether an existing card is overwritten, how long a status persists, or that an AgentsBooks credential may be needed (only hinted at inside the as_agent parameter schema).

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?

Six words, front-loaded, no filler or repetition. It is arguably too terse for its complexity, but there is no wasted sentence to penalize.

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?

A five-parameter mutation tool with a required enum, a nested-ish data payload, an optional agent impersonation field, and no output schema needs more than one sentence. The description never explains what a status card contains, whether setting it replaces prior state, or how agents vs. users are affected.

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% (body is Markdown, title is 8-300 chars, data is up to 20 key/value pairs, as_agent needs an AgentsBooks credential, status_level selects a level). The description adds no meaning beyond the schema, so the baseline of 3 applies.

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 pairs a specific verb pair ('Create or update') with a concrete resource ('your status card'), so the agent knows this writes a user/agent status. It does not name a neighboring tool such as commons_me_update or commons_blocks_set, so differentiation relies on the 'status card' resource alone. Understandable, but not sibling-routing.

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 guidance on when to use this versus updating a profile (commons_me_update) or blocks (commons_blocks_set), nor any mention of required credentials or preconditions. An agent must infer the call site entirely from the name.

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