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

Annotations already declare destructiveHint=true, openWorldHint=true, readOnlyHint=false and idempotentHint=false, so the safety profile is covered. The description adds genuinely new behavioral context beyond that: the secret is never returned inline but routed to a trusted local helper, and a local CLI command is returned when a secret is involved. It does not, however, mention permission requirements or the optimistic-concurrency behavior implied by the required expected_version.

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?

Three short sentences with the purpose front-loaded and the two behavioral facts following immediately; there is no filler. The phrasing 'A new secret goes to the trusted local helper only' is slightly indirect but still earns its place.

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?

This is a destructive, open-world mutation with 9 parameters, 6 required, a required expected_version concurrency token, and no output schema — yet the description explains almost none of that. An agent cannot infer from the prose how to set disable/rotate_secret or what version to pass for a brand-new account, which is a significant gap for a destructive tool.

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 low (33%), so the description is expected to compensate and does not: name, scopes, account, disable, rotate_secret and expected_version are given no meaning in the prose. The four mode-switching flags in particular are undocumented anywhere, leaving the agent to guess how create vs update vs rotate vs disable is actually selected.

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 resource (service account) and enumerates the four operations it performs (create, update, rotate, disable), which maps cleanly onto the save/upsert semantics of the tool. It clearly separates itself from the read-side sibling summer_service_accounts_list, though it never explicitly names that sibling or other alternatives.

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 guidance on when to choose each mode — nothing tells the agent that disable=true means deactivation or rotate_secret=true means key rotation, nor when to prefer this tool over siblings like summer_messenger_installations_rotate_key. The only contextual hint is the note about secret delivery, which is behavioral rather than usage-routing.

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