flightHappinessIndex

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

No annotations are provided, so the description carries full burden. It doesn't disclose any behavioral traits: no indication of whether this is a read-only query, if it has side effects, rate limits, authentication needs, or what the output looks like. The description only lists topics without explaining how the tool behaves when invoked. This is inadequate for a tool with 4 parameters and no annotations.

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 description is a single run-on sentence listing topics, which is somewhat concise but poorly structured. It starts with a usage hint but lacks clear organization. While it avoids unnecessary words, the list format with 'etc.' at the end feels incomplete and could be better formatted for readability. It's front-loaded with the usage context, but the content is vague.

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 the complexity (4 parameters, no annotations, no output schema), the description is incomplete. It doesn't explain what the tool returns, how the 'happiness index' is calculated or presented, or any behavioral aspects. The list of topics is broad but doesn't tie back to the input parameters or expected output. For a tool presumably providing detailed flight assessments, this leaves too many gaps.

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%, so the schema already fully documents all 4 parameters (arr, date, dep, fnum) with clear descriptions and patterns. The description adds no parameter-specific information beyond what's in the schema. According to guidelines, when schema coverage is high (>80%), the baseline is 3 even with no param info in the description, which applies here.

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 lists topics but doesn't state what the tool actually does. It says 'using this tool when you need information related to following topics' followed by a list, but doesn't specify the action (e.g., 'retrieve', 'calculate', 'compare'). It's vague about whether this returns a happiness index score, provides detailed reports, or something else. The name 'flightHappinessIndex' suggests some kind of scoring or rating, but the description doesn't confirm this.

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 description starts with 'using this tool when you need information related to following topics' which provides some context, but doesn't explicitly say when to use this vs. sibling tools like searchFlightItineraries or searchFlightsByNumber. It lists broad categories but gives no guidance on prerequisites, alternatives, or exclusions. For example, it doesn't clarify if this is for specific flights (matching the schema) or general comparisons.

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