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

Annotations only establish non-readonly/non-destructive; the description adds genuinely useful behavior beyond that: content is not recorded and billing follows payment_mode. It still omits whether the session persists, how it terminates, or whether repeated calls are idempotent, but the non-persistence and billing disclosure are meaningful additions.

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, front-loaded with the defining characteristic of the state, and no filler. It is tightly sized, though the parenthetical "(payment_mode)" is slightly redundant against the schema.

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?

There is no output schema, and the description does not say what a successful call returns (e.g., a session identifier) or how the session ends. For a session-creation tool among several session siblings, that lifecycle gap leaves the definition only minimally complete.

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 coverage is 100% with only two parameters, so the schema already documents auth_token and payment_mode thoroughly. The description only restates the payment_mode enum values (free/earned-only/external) without adding format or consequence details beyond the schema, so baseline 3 is appropriate.

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 conveys the effect ("enter a non-productive state") but never names the resource it acts on — the ISE session is only identified in the title and sibling names like exit_ise_session/get_ise_status. It does not explicitly distinguish itself from the sibling create_sdac_session, so an agent must infer that ISE is the non-accountable counterpart. Purpose is understandable but not crisply stated as a verb+resource.

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 condition "where no decision, execution, or accountability declaration is required" implicitly tells an agent when this state is appropriate, which is more than nothing. However, it names no alternative (create_sdac_session) and gives no guidance on the session lifecycle or when to use exit_ise_session instead of simply not creating one. Usage is inferable rather than explicit.

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