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

Annotations already declare readOnlyHint=true, so the safety profile is covered; the description earns credit for adding real behavioral context beyond that – the selected-vs-delivering distinction, the caveat that a chosen Slack that is not connected or email that cannot be sent is 'selected but not delivering', and the warning that a webhook receipt is not proof of reading. It stops short of describing ordering or how the settings are scoped, which keeps it from a 5.

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 scoping statement is front-loaded and the selected-vs-delivering rule follows logically, with the parenthetical example doing useful work. It is dense and slightly run-on, and the closing caveats ('A webhook receipt is not proof the person read it', 'Does not subscribe or send') sit at the end where they are easy to skim past.

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?

With zero parameters, no output schema and readOnlyHint=true, the description carries the burden of explaining what comes back, and it does: selected vs delivering, own email, connected Slack workspaces, scheduledTask, subscription readiness, plus the explicit limit that it neither subscribes nor sends. What is missing is how the returned channels map to conversation scope (all conversations vs per-chat) and whether the values reflect the caller's identity only.

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?

The tool takes zero parameters, so the baseline is 4 and there is nothing for the description to compensate for. The description does spend words on output fields (selected, delivering, email, Slack workspaces, scheduledTask) but that is return-value semantics rather than parameter semantics.

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?

Identifies a specific resource (shared project and direct chat notification settings for yourself, across all conversations) but never states a verb such as 'get/read' – the read intent is only implied by context. It does implicitly differentiate itself from the write siblings by stating 'Does not subscribe or send', so an agent can place it apart from set_chat_notification_settings and send_chat_notification_test.

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?

Usage is implied rather than stated: 'only say a channel will receive when it is in `delivering`' tells the agent how to interpret the result, and 'Does not subscribe or send' hints that a sibling handles mutation. There is no explicit when-to-use, no mention of get_chat_notification_tests or get_chat_setup_status as alternatives, and no exclusions.

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