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

Annotations already cover safety (readOnlyHint=false, idempotentHint=true, destructiveHint=false), and the description adds real context beyond them: the operation only ever affects the authenticated connector's own notifications, and it requires being signed in. It does not say what happens with already-read or nonexistent ids, though the idempotent hint partly covers that.

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?

Front-loaded with the action and scope, then the id/all behavior, then the auth note in a short second sentence. The middle clause is dense (ids, source, and the all-unread default in one breath) but every phrase carries information.

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 two-optional-parameter mutation with full schema coverage and no output schema, the description covers scope, auth, sourcing of ids, and default behavior. Only the response shape and handling of invalid ids are unspecified, which are minor given the idempotent annotation.

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 100%, so the baseline is 3, but the description adds meaning the schema lacks: ids should come from get_notifications, and with neither parameter the default is 'all unread ones'. That default behavior is not stated in the schema and is genuinely useful.

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 (marks notifications as read) and pins the scope to 'the person who connected the app on Veritula', which cleanly separates it from sibling reads like get_notifications. The analogy to 'opening their notifications page' gives an immediate mental model.

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?

Explicitly positions the tool against get_notifications by noting that reading with get_notifications leaves items unread on the site, which is a strong when-to-use cue. It stops short of stating any when-not-to-use condition or warning about over-marking, so it falls just shy of the top band.

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