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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds genuinely useful context beyond that: deals are sourced from vendor pages and official accounts, and an end date appears only when the source stated one, which warns the agent about missing fields. It stops short of describing result volume, ordering, or pagination.

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 short sentences, front-loaded with the core action and provenance, then the filter semantics. The status enumeration duplicates the schema slightly, but nothing is padded or buried.

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?

For a single-optional-parameter read tool with annotations and no output schema, the description covers what is returned, where it comes from, and a key data-quality caveat about end dates. Only result ordering and volume are unaddressed, which is minor here.

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% and the enum already documents live/upcoming/ended/all with the live default. The description restates the same enum values and default rather than adding format or behavioral nuance, so baseline 3 applies.

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 ('List VidFare deals') and adds provenance ('copied from vendor pages and official accounts'), which tells an agent what kind of data this returns. It does not explicitly contrast with the sibling tools, but the deal-listing scope is distinct enough from pricing/model tools to be unambiguous.

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 explains the status filter and its default, which hints at how to narrow results, but it never says when to reach for this tool versus cheapest_options or get_model_prices, nor any exclusions.

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