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

With destructiveHint=false and openWorldHint=true already declared, the description adds the externally visible consequence ('Google may email the people named'), the ownership restriction, and the refusal behavior for founder-owned files. It stops short of describing failure modes for invalid addresses or what the response contains.

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?

Four dense sentences, front-loaded with the action and scope, then constraints. Nothing is wasted, though the CopyConnectedFile parenthetical interrupts the opening sentence rather than sitting in a separate clause.

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-value explanation is not required, and the core sharing semantics are covered. However, with 7 parameters, 0 required fields, and a nested connectionId object, three identifier parameters remain undocumented, which is a real gap for an agent constructing the call.

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 only 14%, so the description carries the burden. It explains the role enum (reader/commenter/writer), the emails list ('addresses the member named'), and anyoneWithLink ('anyone holding the link'), but leaves agentName, companyId, and connectionId completely unexplained in both schema and description.

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 (shares) and resource (one Google Drive file Lovie created), names the creating sibling (CopyConnectedFile), and enumerates the permission levels. An agent can distinguish it from connection_copy_connected_file and connection_get_connected_file without opening either 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 an explicit precondition ('Call it only for a share the member approved in this conversation') and an exclusion ('Only files Lovie created can be shared; the founder's own files are refused by Google'), which implicitly routes the agent to CopyConnectedFile first. It never names an alternative tool outright, so routing is inferred rather than stated.

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