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

Annotations already establish that this is a non-read-only, non-destructive, closed-world mutation. The description adds useful behavioral context beyond the annotations by explaining that marked actions will be skipped in later briefings and by clarifying the snooze date format.

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?

The description is three short sentences with no filler and front-loads the core action. The extra detail about later briefings and snoozeUntil is directly useful and efficiently placed.

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?

The output schema and annotations reduce the description's burden, and it covers the downstream effect of the update. However, for a five-parameter mutation with no schema descriptions, it leaves essential identifiers such as projectId and actionKey unexplained.

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 0%, so the description must compensate for five undocumented parameters. It only explains the status values and the snoozeUntil date format; projectId, actionKey, and note receive no semantic explanation, and the status enum is already present in the schema.

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 uses a specific verb (“Mark”) and resource (“briefing action”) and names the three target statuses. It clearly distinguishes a mutation from the sibling read/list tools, though it does not explicitly name the related briefing tool or use the tool name's “recommendation” terminology.

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 gives explicit timing: “Call this after the user finishes or rejects an action.” That is clear usage context for an agent, but it does not state when not to use the tool or mention alternative ways to handle briefing actions.

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