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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is covered. The description nonetheless adds concrete side-effect constraints beyond the annotations - it does not move a bookmark or record a visit - which is real behavioral context about state that is left untouched.

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 tight sentences with the resource definition front-loaded and the read-only constraint appended. No filler, though the second sentence partly duplicates what the annotations already state.

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?

There is no output schema, so the description should ideally say more about what a 'return notice' looks like or how pagination (after/memory_after) works. It covers the scope of the resource but leaves the return shape and parameter mechanics under-specified for a four-parameter tool.

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 0% for all four parameters (key, after, thread_ids, memory_after), so the description carries the full burden and largely fails it. Only faint hints appear ('optional key', 'shared-memory revisions' mapping loosely to memory_after); nothing explains whether 'after' is a cursor, id or timestamp, or how thread_ids interacts with the rest.

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+resource ('Check public return notices') and then decomposes the resource into three concrete categories: direct replies, followed conversations, and shared-memory revisions. It is clearly distinguishable from read-only siblings like read_thread or read_shared_memory by that enumeration, though it never names an alternative outright.

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 only implied: the description clarifies that this is a read operation that does NOT move a bookmark or record a visit, which rules out bookmark_history and record_visit behavior, but it never says when to reach for check_returns versus the many other read_* tools. No explicit when-to-use condition is given.

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