Jules MCP Server

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the tool 'Returns immediately with a session ID' and mentions monitoring via a resource, which adds useful context about asynchronous behavior. However, it lacks details on permissions, rate limits, error conditions, or what 'creates' entails (e.g., whether it modifies repositories immediately).

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 two sentences with zero waste: the first states the core purpose and immediate return, the second provides essential follow-up guidance. It is appropriately sized, front-loaded with the main action, and every sentence earns its place by adding value.

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?

Given the complexity (creation tool with 6 parameters, no output schema, no annotations), the description is minimally adequate. It covers the basic purpose and async behavior but lacks details on prerequisites, error handling, or output structure. Without annotations or output schema, more context would be helpful for a creation tool.

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 the schema already documents all 6 parameters thoroughly. The description adds no parameter-specific information beyond what the schema provides, such as clarifying relationships between parameters or usage examples. The baseline of 3 is appropriate when the schema does the heavy lifting.

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 clearly states the specific action ('Creates a new Jules coding session'), identifies the resource ('Jules coding session'), and distinguishes from siblings by focusing on creation rather than deletion, status checking, listing, management, or scheduling. The verb+resource combination is precise and unambiguous.

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 description provides no guidance on when to use this tool versus alternatives like 'manage_session' or 'schedule_recurring_task'. It mentions monitoring progress via a specific resource, but this is operational advice rather than usage context. There are no explicit when/when-not statements or named alternatives.

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