Get service account

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

With no annotations, the description bears the full behavioral burden. It does disclose a useful nuance (two lookup modes: email or resource path), and read-only intent is evident from 'Fetches', but it says nothing about permission requirements, not-found behavior, or error semantics.

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 tight sentence with the verb front-loaded and zero filler. It is appropriately sized for a simple lookup, though it could carry one more clause without becoming bloated.

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?

Adequate for a two-parameter read tool with complete schema coverage, but with no output schema the description does not indicate what a service account object contains, and it omits the projectId default behavior that the schema carries.

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%, so both parameters are already fully documented and the baseline is 3. The description's mention of the projects/{p}/serviceAccounts/{id} form is drawn from the resource-name convention rather than adding new parameter semantics.

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 and resource ('Fetches one service account') and constrains it to a single item, which implicitly separates it from gcp_list_service_accounts and the key/delete siblings. It does not name those siblings, so it falls short of a 5.

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?

Usage is implied by the word 'one' — this is the single-item lookup used when you already have an email or resource name. No explicit when-to-use, prerequisites, or alternative-channel guidance is given.

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