reply_to_email

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

No annotations provided. Description mentions immediate sending and threading, and requires a permission (PROTONMAIL_ALLOW_SEND). However, it does not disclose that sending is irreversible, or describe confirmation or error handling. Adequate but could be more explicit.

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 purpose. Each sentence adds value: action, usage, alternatives + requirement. No waste.

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?

Explains when to use and requires a permission, but does not describe return value or error conditions. Given no output schema, adding return info would be beneficial. Minor gaps remain.

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 descriptions. The description does not add meaning beyond the schema (e.g., format body, structure of attachments). 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?

Clearly states the action: 'Immediately send a reply to an existing email, threading it correctly via In-Reply-To and References headers.' Differentiates from siblings (create_reply_draft, create_thread_reply_draft) by mentioning when to use each.

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?

Explicitly says 'Use when you have an emailId and want to send the reply right away.' Also provides alternative tools for different scenarios, guiding selection.

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