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

Annotations declare readOnlyHint=false, destructiveHint=false, openWorldHint=true, so the safety profile is partly covered. The description adds useful context that media and Page are preserved (a partial-update trait) beyond what annotations state. However, it omits the central behavioral fact that this only stages edits and applies nothing until a separate confirmation.

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?

A single front-loaded sentence with no wasted words; the constraint is placed immediately after the action. It is efficient, though its brevity is also the source of the missing workflow detail rather than deliberate compression.

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?

An output schema exists so return values need not be described, but for a mutation tool with 0% parameter coverage the description is thin. It fails to convey the two-phase prepare/confirm workflow that governs correct invocation, leaving the agent without the context needed to complete the operation safely.

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 0%, so the description must carry parameter meaning and it only partially does. It names the three editable fields (body/title/description) but says nothing about ad_id beyond 'same Ad ID', nor about ad_account_id or the opaque connection_context parameter. Required-field semantics remain undocumented.

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 (Prepare) plus the fields being edited (body/title/description) and the key constraint (same Ad ID, preserving media and Page). This distinguishes it from the sibling ads_update_url_prepare and ads_replace_creative_prepare. It does not explicitly signal its role as stage one of the prepare/confirm/deny sequence, but the intent is clear.

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?

No when-to-use guidance and no routing to complementary siblings. Critically, it never tells the agent that this is a staging step that must be followed by ads_update_copy_confirm (or abandoned via ads_update_copy_deny), nor how it differs from the read-oriented ads_get_copy. Usage must be inferred entirely.

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