update_list_status_for_contact

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

Description indicates write operation, reversible, and linking records, consistent with annotations (readOnlyHint=false, destructiveHint=false). Adds HTTP method but no additional behavioral details beyond annotation hints. Schema includes a warning about re-subscription, which is not in description.

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?

Description includes some noise (emoji, URL path) and could be more streamlined. It is functional but not optimally concise.

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?

Covers the main action adequately given the tool's simplicity (one nested parameter, no output schema). However, lacks mention of return values or behavior in edge cases.

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 detailed parameter descriptions. Description adds minimal value beyond summarizing subscribe/unsubscribe actions. 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?

Description clearly states 'Update list status for a contact' and elaborates with specific actions: subscribe/unsubscribe. It distinguishes from sibling tools like create_new_list or create_contact_tag by focusing on modifying membership status.

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?

Provides basic usage instructions: subscribe or unsubscribe a contact. Mentions reversibility. However, lacks explicit when-not-to-use or alternatives among the many sibling tools.

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