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

Annotations already declare readOnly/idempotent/non-destructive/openWorld=false. The description goes beyond them with genuinely useful behavioral detail: canonicalId is the durable identity the traverse door serves while slug is a mutable discovery input, and that bare signals/verticals keys are deprecated aliases. That deprecation and identity-stability context is the kind of thing annotations cannot convey.

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 purpose is front-loaded in the first clause, but the second sentence is a dense run-on that enumerates output fields, units, windows, and scope in a single breath. Much of this is field documentation that would be better placed elsewhere, and 'each count with its unit, window and scope' is low-yield.

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 no output schema, the description must carry return-value explanation, and it does describe row contents (canonicalId, aliases, addresses, counts) and the two count families. Safety behavior is covered by annotations. It is largely complete for a single-optional-parameter read tool, though the routing gap against siblings remains.

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 single parameter (limit) is fully described in the schema at 100% coverage, and the description adds nothing about it. Per the high-coverage baseline, 3 is appropriate — the schema carries the parameter semantics entirely.

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 resource (entities/topics accelerating most) and a ranking criterion (cross-domain attention), with a temporal scope ('right now'). It never names or distinguishes itself from plausible siblings like get_signals, get_corroborated, or todays_brief, so an agent cannot fully route on the description 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 phrase 'right now' implies a freshness/current-moment use case, but there is no explicit when-to-use, when-not-to-use, or named alternative. An agent choosing between this and the several other ranking/feed tools gets no guidance.

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