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

No annotations are provided, so the description carries the full burden. It implies a mutating action but says nothing about side effects (does it create a deliverable? notify anyone? require an approved engagement?), whether it is idempotent, or whether starting work twice is an error — all material for a creation-style tool.

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 short sentence with zero filler, and the core action is front-loaded. The em-dash example is the only extra clause, and it earns its place by illustrating the resource, though the definition is arguably too terse for the mutation it performs.

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 three-parameter creation tool with no annotations and no output schema, the definition should state at minimum what is produced (a work item or deliverable id?), what preconditions apply, and what the caller gets back. None of that is present, leaving the agent unable to predict the result of the call.

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 case_id, task_type and instructions are already documented in the schema. The description adds a small amount of meaning by equating "case" with "client engagement" and by giving a concrete task_type example, but provides no syntax, format, or allowed-value detail beyond that. 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?

Names a specific verb ("start") and resource ("a piece of work on a client engagement (a case)"), and the parenthetical plus the "this month's report" example make the object concrete. It does not, however, distinguish itself from siblings such as list_recurring_work or get_deliverable, so an agent must infer the boundary.

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 example gives a flavor of the scenario but there is no explicit when-to-use / when-not-to-use guidance, no prerequisites, and no mention of sibling tools. An agent cannot tell from the text whether to call start_work before or after list_recurring_work, or what happens if work already exists for that case.

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