syncky_ack

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

The annotations already declare idempotentHint=true, destructiveHint=false, readOnlyHint=false, and openWorldHint=true, so the safety and repeatability profile is supplied. The description contributes the extra fact that the ACK advances a durable checkpoint and explicitly excludes Health state changes, which is real behavioral context, though it never says what happens on failure or what the call returns.

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 sentences, no padding, and the checkpoint constraint is front-loaded. The terseness works against it, however, because the compressed phrasing is what makes the purpose opaque rather than clarifying it.

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?

For a one-parameter mutation with no output schema and no annotation coverage of return behavior, the description leaves too much open: the meaning of up_to_seq, what advancing the checkpoint implies for other consumers, and what the caller receives are all unstated.

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% for the single required parameter up_to_seq, so the input schema gives only type and integer range. The description does not explain that up_to_seq is the sequence watermark being acknowledged, its inclusive/exclusive boundary, or how it relates to the durable checkpoint, leaving the only parameter semantically undefined.

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 says 'ACK only through the durable receive checkpoint', which restates the name's verb without explaining the resource or what an ACK actually does. An agent cannot tell from this whether it acknowledges messages, events, or sequence positions, nor how it differs from syncky_inbox or syncky_status.

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?

'Only through the durable receive checkpoint' and 'Does not apply Health changes' are scoping constraints rather than usage guidance. There is no statement of when to call this instead of a sibling, no prerequisite, and no condition under which it should be avoided.

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