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

Annotations already establish this is a non-destructive, closed-world write (readOnlyHint=false, destructiveHint=false, openWorldHint=false). The description adds one genuinely useful behavioral fact beyond that — "Commits immediately" — telling the agent there is no draft or confirmation step. It stops short of saying what defaults are applied, whether duplicate routines are rejected, or how the new routine affects today's schedule.

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 with the core purpose front-loaded and zero filler; the immediate-commit warning is placed where it will be read. It is efficient, though the brevity leaves little room for the schema-level context this tool actually needs.

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 nine-parameter creation tool with a nested free-form object and no output schema, the definition is thinner than ideal — it says nothing about defaults, recurrence semantics, or what is returned after creation. The immediate-commit note and the chore/decision framing carry a lot of the weight, but an agent could still call this incorrectly on scheduling fields.

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 only 33% across nine parameters, so the description needs to compensate and largely does not. It implicitly covers `kind` via the chore/decision split, but `weekdays`, `frequency`, `visibility`, `default_energy`, and the `additional_information` nested object get no explanation, including the non-obvious interaction between weekdays and frequency.

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 gives a specific verb plus resource ("Create a recurring routine") and splits it into two concrete modes, a recurring chore and a variable recurring decision such as meals, which maps to the `kind` enum. It does not, however, distinguish this from near-siblings like create_task, bulk_create_tasks, or create_reminder, so an agent must infer the boundary itself.

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 only usage signal is implicit: the word "recurring" suggests this is for repeating items rather than one-offs. There is no explicit when-to-use, no when-not-to-use, and no named alternative for one-time tasks or reminders, which is a real gap given how many create_* siblings exist.

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