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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds the filterable dimensions but says nothing about pagination defaults, result volume, or ordering, which is the remaining behavioral gap. With annotations carrying the main burden, a 3 is appropriate.

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?

A single front-loaded sentence that states the action first and the optional narrowing second, with zero filler. Nothing is redundant 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 6-parameter list tool with no output schema and 0% schema description coverage, the description leaves the pagination contract (limit/offset) entirely undocumented and gives no hint of return shape or default page size. It covers the filtering story adequately but not the full calling contract.

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 6 parameters, so the description has to compensate. It names four of them (project, entity, trigger point, enabled state) in natural language, but limit and offset are never mentioned and no filter syntax or enum values ('before-request'/'after-request') are clarified.

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 ('List') and resource ('Functions') and enumerates the available filter dimensions, so an agent can tell this is the read counterpart to create_function/update_function. It does not explicitly contrast itself with the many sibling list_* tools, but the resource noun is 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?

The phrase 'optionally filtered by...' implies when the tool is useful (broad listing, narrowed by project/entity/trigger/enabled), which is implied usage rather than explicit guidance. There is no statement of when to prefer a sibling such as describe_project or list_deployments, and no prerequisites or exclusions.

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