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

Annotations already declare readOnlyHint=true, destructiveHint=false, and idempotentHint=false, so the safety profile is covered. The description adds pagination semantics (the preceding part supplies the receipt) but omits whether more parts may follow, how completion is signalled, or why the call is non-idempotent. Some added value, but gaps remain.

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?

Two short sentences with the core action front-loaded and the parameters parenthesized where expected. The second sentence is awkwardly phrased and slightly cryptic ('names what later parts hold'), costing some clarity but not much length.

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?

There is no output schema, so the description carries the burden of explaining what comes back on a continuation call, and it does not: it never says whether more parts may remain or how the agent knows the read is finished. Annotations cover safety, but for a pagination continuation tool this is a meaningful omission.

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%, so both parameters are already documented in the schema. The description's notes about read_id and receipt provenance largely restate that, adding no format or edge-case detail beyond structured data. Baseline 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?

States a clear verb and resource: fetching the next part of a paginated read, with the trigger condition (the read did not fit in one response). It references the originating arroway_read implicitly via 'read_id ... returned by the incomplete arroway_read response', but does not explicitly name a sibling alternative, so it falls short of the 5 bar.

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 trigger condition is stated ('a read that did not fit in one response'), which is useful context. However, there is no explicit comparison with alternatives and the 'OPTIONAL: the first part already counts as delivered' clause is ambiguous about whether/when the agent should actually call this, leaving usage partly to inference.

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