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

Annotations already declare readOnlyHint=true and destructiveHint=false, and the description adds real value beyond that: every call consumes one token, and the idempotency key governs retry/recovery semantics (reuse only to recover a lost response, new key for new execution). Minor noise comes from the garbled phrase 'anonymous taste calls' and the untranslated Korean cost line, which reduce confidence in the exact rule.

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?

Purpose is front-loaded, but three consecutive sentences restate the same idempotency policy and the trailing Korean cost note reads as appended boilerplate. Too much of a session-status check's word budget goes to retry mechanics rather than the tool itself.

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?

With no output schema, the description should say what 'status' actually reports (authenticated/expired, which provider session, account link resolution result). That is absent, leaving the agent able to call the tool but unsure how to interpret the result.

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%, so the baseline would be 3; the description earns above that by explaining request_idempotency_key's lifecycle (generate before first request, reuse only for lost-response recovery) and warning not to confuse it with a provider-specific idempotency_key. account_link_id is not mentioned, but its schema text already handles the auto-resolution rule.

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 first sentence states a specific verb and resource ('Check work24 session status'), which is enough to separate it from the login sibling work24__auth__npki_session__login. It never explicitly contrasts itself with that sibling, though, so an agent must infer the read-vs-authenticate distinction.

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 description gives detailed guidance about the idempotency key but says nothing about when to call this tool versus work24__auth__npki_session__login, or what a session state should look like before other work24 tools are used. The only usage context ('For an authenticated call') describes the key, not the tool.

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