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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered; the description adds value by disclosing the shape of the payload, notably that it includes 'recently blocked hosts', which implies dynamic, time-windowed data an agent would not expect from the name alone. It stops short of stating permission requirements or how far back 'recently' reaches.

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 with no filler; the verb and resource come first and the discovered fields follow as a colon list. Nothing is redundant with the title.

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 one-parameter read tool with rich annotations and no output schema, this is nearly complete: it enumerates what comes back, which substitutes for the missing output schema. It leaves minor gaps around authorization requirements and the time window of 'recently blocked hosts'.

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?

Only one parameter with 100% schema description coverage, so the schema already carries the project_id semantics (including its pattern). The description adds nothing beyond the possessive 'a project's', which merely restates the scope. Baseline 3 applies when the schema does the heavy lifting.

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?

Specific verb plus resource: 'Read a project's outbound-network (egress) allow-list policy', and it names the fields surfaced (enabled, allowed hosts, recently blocked hosts). It is clearly the read counterpart to the sibling set_egress_policy, so an agent can route between them without opening schemas.

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?

Usage is only implied: 'Read ... policy' signals inspection versus the write sibling set_egress_policy, but the description never states when to call this, any prerequisites (e.g. project access level), or that it should be used before mutating the policy. An agent must infer the workflow.

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