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

Annotations already declare idempotentHint=true, destructiveHint=false, readOnlyHint=false and openWorldHint=false, so the safety profile is covered. The description adds one genuinely useful behavioral fact not in the annotations: it authenticates against the connected Himalayas account with no extra sign-in. It says nothing about the result of omitting both parameters (a no-op?) or the state change semantics.

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, front-loaded with the operation and its two modes, with no filler. The closing auth sentence is slightly tangential to the call itself but is cheap and informative.

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?

A low-complexity two-parameter mutation with full schema coverage and no output schema; the description plus annotations give the agent enough to invoke it correctly. Only minor gaps remain: no statement of what happens with zero arguments and no cross-reference to the sibling message-marking tools.

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% and both parameters are already documented in the schema ('Notification id from list_notifications', 'true marks every notification as read'). The description restates the same semantics rather than adding syntax, defaults, or interaction rules (e.g. precedence when id and all are both supplied), which is the appropriate baseline 3.

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 ('mark ... notifications as read') and covers both single-target and bulk modes via 'id' or 'all: true'. It does not, however, differentiate itself from the closely named siblings mark_message_read and mark_my_message_read, leaving the agent to infer the notification-vs-message split from the resource noun alone.

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 description tells the agent how to pick between id and all: true, which is implied usage guidance, but it offers no when-to-use or when-not-to-use context, no prerequisite (e.g. notifications must exist, call list_notifications first), and no routing away from the message-marking siblings.

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