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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds genuinely new behavior: that board items persist after claim/signal/waiting/release, and specifically that this call does NOT advance the unread cursor — a non-obvious side effect that separates it from message-reading siblings.

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?

Three short sentences, front-loaded with the resource and its contents. Slight deduction because the middle sentence ("Claim, signal, waiting, and release stay on board") is terse to the point of ambiguity — it reads as a list of action names rather than a clear statement of state persistence.

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 input schema, no output schema, and full annotation coverage, the description does the remaining work: it sketches the returned board contents and flags the cursor side effect. The absent piece is how this differs from the `board` sibling, but for a zero-param read tool it is close to complete.

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?

The tool takes zero parameters, so per the baseline this scores 4. The description correctly spends no space on parameter prose, focusing instead on content and side effects.

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 and resource ("List the Space Board") and enumerates what comes back — live claims/signals/waiting, parking count, SLA flags — so the agent knows the payload shape before calling. It does not, however, distinguish itself from the very similarly named sibling `board` or from `list_parking`/`space_state`, which is the only thing keeping it from a 5.

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?

The line "Claim, signal, waiting, and release stay on board" plus "does not advance the unread cursor" implies when this snapshot is appropriate versus a cursor-advancing read, but no sibling is named and no explicit when-to-use/when-not condition is given. With `board`, `list_parking`, and `space_state` in the sibling set, the agent is left to infer the distinction.

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