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

With no annotations, the description carries the full burden, and it does disclose the key side effects: a calendar event is created and the candidate is notified externally. It says nothing about what happens if the scheduling provider is not connected (a create_calendar_connection sibling exists), whether the call is idempotent on retry, what occurs if the slot has been taken, 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, both front-loaded: effects first, then workflow placement. No filler, no restatement of the name, and the reader gets the actionable constraint in the second sentence.

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 multi-effect mutation tool with zero annotations and no output schema, the definition covers purpose and preconditions but not outcome or failure behavior. An agent still cannot tell whether a returned value exists, whether requires a pre-existing calendar connection, or whether retrying is safe.

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 all five parameters including the provider enum and ISO 8601 format are already documented. The description adds only the framing that scheduled_at must correspond to an already-selected time; it contributes no additional meaning for provider or duration_minutes.

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 names three concrete operations (confirm a time, create a calendar event, notify the candidate), which is far more specific than a generic 'schedule interview'. It does not name a sibling, but the phrase 'final step ... once a time is selected' implicitly separates it from slot-discovery tools like get_available_slots.

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?

'Use this as the final step in the scheduling process once a time is selected' gives a clear precondition and workflow position, which is the main thing an agent needs to avoid calling it prematurely. It stops short of explicit exclusions or naming the prerequisite tool, so it is not a full when/when-not statement.

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