Focus Mode Guardian

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

Annotations already declare readOnlyHint=true, destructiveHint=false, and idempotentHint=true. The description adds that the tool 'auto-snapshots' today's events and reminders, but this is incomplete and potentially misleading if snapshots involve writing. No further behavioral details (e.g., what happens on invocation, error cases) are provided.

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?

The description is a single incomplete sentence ending with '...', indicating truncation. It is not well-structured or front-loaded, and it fails to convey the tool's purpose efficiently. Being short does not equate to conciseness when it lacks clarity.

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?

Given the tool has no parameters and annotations are present, the description should explain the tool's behavior, return value, and relationship to other tools. Instead, it is incomplete and does not cover any of these aspects. Output schema is missing, and no behavioral context is provided.

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?

With zero parameters, the schema provides no constraints. The description adds that the tool operates on today's events and open reminders, which gives some context. However, it does not clarify how these are selected or if any implicit filters apply. Baseline 4 is adjusted down due to vague description.

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 'Auto-snapshots today's events and open reminders whenever the system ...' is vague and incomplete, failing to clearly state what the tool does. The title 'Focus Mode Guardian' implies a focus-related function, but no specific verb or resource is identified sharply. The description is confusing and does not distinguish from sibling tools like toggle_focus_mode.

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?

No guidance is provided on when to use this tool versus alternatives. The description does not mention context, prerequisites, or exclusions. Sibling tools exist for similar purposes (e.g., timeline_today, today_events), but no differentiation is given.

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