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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds useful domain behavior—only 'completed' check-ins and ordering 'newest first'—but does not disclose additional operational traits like pagination, limits, or auth requirements; with annotations carrying the core behavior, a 3 is warranted.

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, front-loaded with the core action and followed by the intended trigger. No filler or redundancy.

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 no-parameter read tool with readOnly/idempotent annotations and an output schema, the description covers what is read, the ordering, and when to call it. The only slight gap is that 'the feed' and 'status' are assumed domain vocabulary, but the core invocation context is present.

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 has zero parameters and schema description coverage is 100%, so there are no parameter semantics for the description to add. Baseline for zero parameters is 4.

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?

Description opens with an explicit verb and resource: 'Read recent completed check-ins for this linked agent, newest first.' This clearly identifies what the tool does and distinguishes it from siblings such as get_vibecheck_result and get_vibecheck_status, which suggest single-result or status reads.

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?

'Replenish the feed when status requests it' provides a concrete trigger for when to call the tool, but it does not explicitly name alternative tools or state when not to use them. This is clear context without exclusions, so 4 is appropriate.

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