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

readOnlyHint already covers the safety profile, so the description's 'Read-only' restates it, but it adds genuinely new behavior: the 404 NO_BRIEFING empty-state signal and the Space-scoping/override semantics. It stops short of saying how a stale briefing is represented or whether the response is cached.

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 paragraph, front-loaded with what is returned before the edge cases and scoping rules. Every clause carries information, though the 'Read-only' sentence is redundant with the annotation and could be dropped.

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?

With no output schema, the description compensates by describing the return payload's three components and the error case, which is what an agent needs. The only missing piece is disambiguation from get_answer_brief in a very large sibling set.

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% and the single space_id parameter is fully documented there, including the pattern and session-binding behavior. The description's 'pass space_id to override for this one call' merely echoes the schema, so baseline 3 is right.

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 resource (the growth manager's latest briefing) and enumerates its contents — covering period, text, and prepared changes with status. That is far more concrete than the title. It does not, however, distinguish itself from the similarly named sibling get_answer_brief, which an agent could easily confuse with it.

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 clear usage context: read the briefing for the active Space, use set_active_space to switch, or pass space_id for a one-off override, and expect 404 NO_BRIEFING when nothing exists. The one gap is that no alternative tool is excluded — get_answer_brief is never mentioned as the thing to use for a different kind of brief.

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