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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorld=false, so the safety profile is covered structurally. The description adds real behavioral context beyond that: the 50-item cap, the null-when-absent semantics of comparisonPages, and the effect of includeUntracked. It does not discuss pagination beyond the cap, but that is minor.

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?

Three tight sentences, front-loaded with scope and shape, then the parameter behavior, then routing. No filler; the parenthetical defining aliases as 'other names AI answers count as naming them' resolves ambiguity in a single clause.

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 an output schema present the description needn't enumerate return values, yet it usefully previews comparisonPages. Combined with annotations covering safety and a fully documented single parameter, nothing an agent needs to invoke this correctly is missing.

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 semantic nuance the schema lacks: the schema says 'no longer tracked' while the description clarifies this means 'unstarred.' That extra interpretation is genuinely useful for a single-param tool.

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 ('Lists the competitors this workspace tracks') and immediately bounds the scope with a row cap and the fields returned (ids, names, aliases, domains, comparisonPages). The explanation of comparisonPages per kind (vs, alternative, pricing) is precise enough that an agent knows exactly what it gets back.

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?

Provides a conditional usage rule for the one parameter ('Pass includeUntracked to also see ones that were unstarred') and routes the agent via a 'Related' list of siblings (track_competitor, set_competitor_aliases, get_competitor_scorecard, draft_competitor_page). It stops short of explicitly stating when to prefer get_competitor_scorecard over this tool, so no exclusion guidance.

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