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

readOnlyHint=true already covers the safety profile, so the description's real contribution is disclosing output redaction: payroll identifiers are excluded from staff responses and leave notes are omitted. That is non-obvious behavior an agent cannot get from annotations or schema, though it does not say whether the redaction is caller-role dependent.

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, no filler, with the core action front-loaded and the caveat about omitted fields following immediately. Every clause carries information.

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 some burden for return shape; it mentions only what is excluded, not what a shift record contains. For a simple single-record read with a fully documented ID this is adequate but leaves the returned payload opaque.

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 coverage is 100% and the single id parameter is fully documented in the schema (opaque Workfeed ID from a preceding read, not a UUID), so the description correctly defers. It adds nothing about the parameter, which is acceptable at one parameter but not above baseline.

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?

"Read one selected shift" gives a specific verb (read) and resource (shift) and the word "one" implicitly separates it from the list_* siblings. It does not explicitly name workfeed_list_shifts as the alternative, so the differentiation is inferred rather than stated.

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 singular "one selected shift" implies you should already have an ID and want a single record rather than a collection, but there is no explicit when-to-use/when-not guidance and no sibling tool is named. The agent must infer that workfeed_list_shifts is the alternative for enumeration.

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