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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world behavior, so safety is covered. The description contributes the meaningful detail that steps are evaluated in order, which tells the agent semantics matter, but it says nothing about latency, step limits, or how incomplete funnels are reported.

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 sentence is front-loaded and tight, but the trailing "Tools revision: 5c9bea8f." is noise for tool selection and consumes space that could have documented the steps format.

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?

An output schema exists, so return values need not be described, but the central input — the required steps array with additionalProperties allowed — is completely unexplained. For a tool whose correctness hinges on step definition, this leaves the agent guessing at invocation.

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 0% across four parameters, so the description must compensate and largely does not. It hints at date-range and ordered-step concepts, but never explains the structure of the required `steps` array of free-form objects or the accepted date formats beyond the schema defaults.

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 verb and resource ("Run a GA4 funnel report") plus its shape ("ordered steps over a date range"), which separates it from generic report siblings. It does not explicitly contrast with ga4_run_report, ga4_run_cohort_report, or ga4_run_pivot_report, so an agent must infer the funnel-specific case.

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?

No guidance on when to pick a funnel report over the other GA4 report tools in the sibling list. The parenthetical "(v1alpha)" hints at API stability but says nothing about preconditions or alternatives.

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