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

Annotations declare readOnlyHint=false and destructiveHint=true, so the description's key added value is clarifying that the call is a proposal that does not itself place the task or complete scheduling — essential context that tempers the destructive hint. It still omits what is returned (e.g., a proposal identifier), whether proposals expire, and how it behaves when the slot conflicts with existing blocks.

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?

Three short sentences, front-loaded with the propose-only semantics before the parameter and workflow instructions. Every sentence carries a distinct, actionable instruction with no filler.

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 3-parameter mutation-adjacent tool with no output schema and no annotation detail beyond hints, the description covers the critical ambiguity (proposal vs. committed placement), the input format, and the upstream dependency. It is only slightly short of complete because it does not say what the call returns or how conflicts are surfaced.

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 0%, so the description must carry parameter meaning; it does this for two of three parameters by specifying ISO-8601 for scheduled_start and scheduled_end, a format detail absent from the schema. task_id is left unexplained, and no constraint (past dates, ordering of start before end, timezone) is given.

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 specific verb and resource ('Propose placing a task into a specific time slot') and immediately clarifies the propose-versus-commit distinction, which separates it from confirm/placement behavior. It also names the sibling that produces input (suggest_task_schedule), so an agent can place it in the workflow without opening another schema.

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?

Gives an explicit prerequisite ordering: 'get candidate slots from suggest_task_schedule first.' It also gives an explicit usage rule about what to tell the user ('awaiting their confirmation, never that the task has been placed'), which functions as a when-not-to-claim constraint. Little is left to inference.

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