Jules MCP Server

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

With no annotations provided, the description carries full burden for behavioral disclosure. It mentions pagination behavior and filtering capability (active_only), which are useful behavioral traits. However, it doesn't address rate limits, authentication requirements, error conditions, or what constitutes a 'session' beyond 'coding tasks'.

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 well-structured with clear sections for Args and Returns. Each sentence earns its place by providing essential information. It's appropriately sized for a list operation with three parameters, though the opening sentence could be more front-loaded with key information.

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 tool's moderate complexity (list operation with filtering and pagination), no annotations, and the presence of an output schema (implied by the Returns section), the description provides adequate coverage. It explains parameters well and indicates return structure, though could benefit from more context about the session resource itself.

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?

With 0% schema description coverage, the description must compensate for the schema's lack of parameter documentation. It successfully explains all three parameters: page_size (range and default), page_token (pagination purpose), and active_only (filtering behavior). The description adds meaningful context beyond what the bare schema provides.

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 verb 'List' and resource 'Jules sessions (coding tasks)', making the purpose specific and understandable. It distinguishes the resource type from siblings like 'activities' or 'sources', but doesn't explicitly differentiate from other list operations like 'list_activities' or 'list_sources' beyond the resource name.

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. It doesn't mention when to choose list_sessions over get_session for individual sessions, or how it relates to list_activities or list_sources. There's no context about prerequisites, typical use cases, or exclusions.

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