security_roles

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

readOnlyHint=true already tells the agent this is a safe read, so the description's main addition is scoping the data to the Roles & groups tab of the Security view. It says nothing about permissions required, volume of data returned, or any pagination/refresh behavior, so it adds only modest context beyond the annotation.

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 short sentence with no filler and the key noun (Roles & groups / Security view) front-loaded. It is efficient, though its brevity shades into under-specification rather than pure economy.

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 zero-param read tool with no output schema, the description should at least characterize what comes back (e.g., role/group names with member counts). It identifies the data domain but not the shape or scope of the return, leaving a gap an agent cannot fill elsewhere.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; per the rubric a 0-parameter tool baselines at 4. The description correctly implies a no-argument fetch.

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 the resource (roles & groups data) and its location (Security view tab), which loosely distinguishes it from siblings like security_users, security_tables, and security_pools. However, it uses a noun phrase rather than a verb ("Roles & groups tab data"), leaving the action — presumably returning that dataset — implicit rather than stated.

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?

There is no indication of when to call this versus the adjacent security_* siblings (security_users, security_tables, security_pools, security). An agent must infer selection purely from the resource name, with no prerequisites or exclusions given.

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