saas_api_update_saas_subscription_deprecated

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

Annotations already indicate readOnlyHint=false, destructiveHint=false, idempotentHint=true. The description adds the auth requirement (agency-level token), which is contextual but not behavioral. It doesn't disclose what fields are updated, whether the update is partial or full, or any consequences. No contradiction with annotations.

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?

The description is a single concise sentence with the main action front-loaded and the key prerequisite included. No wasted words, though it lacks additional helpful details, which is a minor cost.

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 write operation with no output schema, the description is minimal. It doesn't explain what 'update' entails, what fields are mutable, return behavior, or how the locationId default works (though schema covers the default). The token requirement is useful, but for a 4-parameter tool with no output schema, this is inadequate.

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 100% – all four parameters have descriptions, including the default for locationId. The description adds no extra semantics beyond the schema, so the baseline 3 applies.

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 states a clear verb and resource ('Update SaaS subscription') and adds an important prerequisite (agency-level token). It doesn't differentiate from sibling tools like update_rebilling or the non-deprecated counterpart, but the core purpose is unambiguous.

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 only guidance is the token requirement ('requires an agency-level token, not a location PIT'), which is a prerequisite but not guidance on when to choose this tool vs alternatives. No mention of when not to use, deprecation status implications, or when to prefer the non-deprecated version. The guidance is essentially an access condition, not usage selection.

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