Google Flights Deals Remote MCP Server

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

Annotations already declare readOnlyHint=true, openWorldHint=true and destructiveHint=false, so safety is covered. The description adds real behavioral context beyond that: which fields come back only for searches Google shaped itself (typical price, discount, destination photo), that a date range is derived from the query, and the breadth of filtering. It omits auth needs and any rate/limit behavior, so it doesn't reach 5.

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 core mechanism and origin-airport scoping are front-loaded, and the return-field enumeration follows. It is dense and somewhat long, but nearly every clause carries information an agent needs (conditional fields, derived date range, filter categories) rather than filler.

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 21-parameter tool with no output schema and no siblings, the description compensates well by enumerating the return payload fields and the conditional nature of some of them, plus an overview of the filter surface. What remains missing (auth, pagination/limits) is minor given the read-only annotation profile.

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 100% and the schema documents all 21 parameters in depth, including the critical arrivalId dependency and filter interactions. The description only summarizes the filter categories (trip type, cabin class, stops, dates, trip length, price/duration ceilings, airlines, party size) without adding syntax or constraints beyond the schema, so the baseline of 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 ('Get Google Flights Deals Results') and immediately explains the distinctive mechanism: a plain-language trip description becomes flight deals from one origin airport with Google choosing destinations and dates. There are no siblings to distinguish from, so this is as clear as it needs to be.

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?

Explicitly names intended uses ('inspiration-driven travel search, seasonal and event-based fare discovery, deal alerting, and travel-content generation'), which tells the agent when this tool fits. No when-not or exclusion guidance, and there are no alternative tools to route against, so 4 is the ceiling here.

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