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

With no annotations, the description carries the behavioral burden well: it discloses the per-check credit cost ('1 credit a check'), the cadence of evaluation, the email notification plus Monday digest, and the default threshold rule ('default 3x its channel'). It omits auth expectations despite the api_key parameter and says nothing about what happens on failure or duplicate alerts.

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?

Dense and front-loaded: the primary action leads, then cost and the API equivalent trail. It is telegraphic (fragments, parenthetical) but every clause carries information; nothing is padding.

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?

Given an output schema exists (so return values needn't be described) and no annotations, the description covers the essential contract: what is created, how often it runs, what triggers a hit, notification behavior, and cost. The remaining gap is undocumented non-obvious parameters, which is the only thing keeping it from full completeness.

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 only 17%, so the description must compensate. It does add real meaning for the core threshold concept ('a new video at your line (default 3x its channel)' maps to min_multiple) and for email/digest behavior, but query, min_vph, and api_key receive no explanation at all, leaving half the surface undefined.

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?

The description names a specific action (save a search) and its resulting behavior (checked daily/weekly, emails hits, Monday digest), which is more than a restatement of the name. It implicitly distinguishes from get_alert/list_alerts/update_alert by describing creation of a persisting alert, though it doesn't name those siblings.

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 context is implied through the alerting behavior and credit cost, but there is no explicit when-to-use guidance nor any mention of alternatives such as create_tracker or save_preset, which occupy adjacent territory in the sibling list. An agent can infer this is the alert-creation path but gets no routing help.

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