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

Annotations already declare readOnlyHint=false and destructiveHint=true, so the agent knows deletion is destructive and writes occur. The description adds the traffic-tracking prerequisite and per-action semantics, but does not state that 'delete' is irreversible, whether values are overwritten on 'set', or what is returned. Adds some context beyond annotations but leaves mutation behavior thin.

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?

Front-loaded with purpose, then a clean per-action breakdown, then args. Slightly padded by the ROI framing sentence and the restated Args block, but generally efficient and well-structured.

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?

Covers purpose, prerequisite, and action semantics, which is solid for a 5-param tool with no output schema. However, as a destructive mutation tool, it omits reversibility, overwrite behavior on 'set', and return/confirmation details, and leaves user_intent unexplained.

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 20%, so the description must compensate, and it does: it defines action values, marks brand_id required, and states which actions require event_name and value. It does not document user_intent, leaving one parameter described only in the schema, but the core parameters are covered.

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 ('Manage conversion tracking values for AI-referred traffic') plus the goal ('measure ROI from AI search traffic'). Clear overall, but it doesn't distinguish itself from the many sibling 'manage_*' tools beyond the conversions domain, which is at least a distinct resource.

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 maps the three actions to their use ('list' to see, 'set' to create/update, 'delete' to remove) and states a prerequisite ('Requires traffic tracking to be set up'). Lacks explicit exclusions vs alternatives, but the action dispatch gives clear when-to-use guidance.

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