Open Template Editor

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

The description discloses that this tool launches a browser UI, a behavioral trait not captured by the annotations or schema. Annotations already establish read-only and idempotent behavior, and the description adds context about the external user-facing action without contradicting them.

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?

The description is a single, front-loaded sentence with no wasted words. Each phrase—SendGrid, template editor, browser, visual editing—adds necessary meaning.

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 simple tool with one optional parameter, no output schema, and comprehensive annotations, the description plus schema fully cover what an agent needs to invoke it correctly. The safety profile is in annotations, and the parameter behavior is in the schema.

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?

The input schema already provides 100% coverage of the only parameter, template_id, including its default behavior of opening the template list if omitted. The tool description adds no additional parameter semantics, so the baseline of 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?

The description states a specific verb ('Open'), a precise resource ('SendGrid template editor'), and the purpose ('for visual editing'). This clearly distinguishes it from siblings like open_automation_editor or programmatic template tools such as update_template.

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?

The phrase 'for visual editing' provides a clear context for when to use this tool versus programmatic alternatives, implying it is the choice for interactive browser-based template editing. It does not explicitly name alternatives or exclusion conditions, but the context is strong enough.

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