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

Annotations already declare destructiveHint=true and idempotentHint=false, so the irreversibility statement partially restates structured data. The added value is the explicit agent workflow requirement to confirm with the user first, which is behavioral guidance the annotations do not carry.

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?

Two sentences, zero filler, with the core action and the identifier source front-loaded ahead of the safety caveat. Nothing could be removed without losing information.

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 two-parameter destructive delete with full schema coverage and annotations carrying the safety profile, this covers action, identifier source, and the confirmation step. Only a note on what happens to references to the deleted template (or an explicit pointer to update_reply_template) would make it fully 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 description coverage is 100% and both replyId and idempotencyKey are documented in the schema, including full retry semantics. The description's mention of replyId's provenance duplicates the schema text rather than adding format or constraint detail, so 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?

States a specific verb (Delete) and resource (saved reply), and points at the sibling that provides the identifier (list_saved_replies). An agent can distinguish this from create_reply_template/update_reply_template without opening any schema.

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?

Gives clear operational context: where the replyId comes from and that the user must be asked before proceeding. It does not name an alternative (e.g. update_reply_template for non-destructive edits), so it stops short of explicit when-not-to-use guidance.

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