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

Annotations already declare readOnlyHint=true, idempotentHint=true, and openWorldHint=true, so safety is covered. However, the description does not disclose the behavior that matters most for this tool: whether it performs live network probes against each pool API (with possible latency/timeouts) or reads a cached status, nor how often status refreshes. Nothing contradicts the annotations, but the description adds little beyond them.

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?

A single clause, front-loaded on the exact resource being reported, with no filler or redundancy. It is efficient, though its terseness leaves the action implied rather than stated.

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 and no parameters, the description carries the full burden of explaining what the agent receives, yet it never says what a 'reachability status' looks like—per-pool entries, up/down flags, timestamps, error reasons—nor whether results are live or cached. For a zero-argument, zero-output-schema tool, this is a substantive gap.

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 and schema coverage is 100%, so there is no parameter semantics to explain. Baseline 4 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 names a specific resource—the reachability status of each mining-pool API used for block attribution—which clearly separates it from siblings like pool_distribution (block share by pool) or chain_provenance. It is a noun phrase without a verb, so the agent must infer that calling it returns status data, but the subject matter is unambiguous.

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 when-to-use guidance, no stated prerequisites, and no mention of alternatives or exclusions. An agent cannot tell from the description whether this is for diagnosing attribution gaps, monitoring upstream health, or pre-checking before pool_distribution.

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