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IBM watsonx.data MCP Server

Official
by IBM

pause_spark_engine

Pause a running Spark engine in watsonx.data. Optionally force pause even if applications are running.

Instructions

Pause a running Spark engine in watsonx.data (SAAS only).

Args: engine_id: Engine identifier force: Force pause even if applications are running (default: False)

Returns: Dict with pause operation status

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
engine_idYes
forceNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

With no annotations, the description carries the full burden. It explains the force parameter's effect but does not disclose what happens to existing applications if not forced, whether the operation is reversible, or any authentication requirements. Lacks depth on side effects.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is three sentences with a structured Args list. It is front-loaded with the main action and is entirely concise with no redundant information.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the simple two-parameter tool, the description covers the action and parameters adequately but lacks detail on return value structure (only 'Dict with pause operation status') and prerequisites (e.g., engine must be running). Not fully complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must add meaning. It defines engine_id as 'Engine identifier' and force as 'Force pause even if applications are running (default: False)', which adds context beyond type/default, though it could specify the format of engine_id.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action (Pause), the resource (running Spark engine), and the context (watsonx.data SAAS only). It differentiates from sibling tools like pause_presto_engine and pause_prestissimo_engine by specifying 'Spark engine'.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description mentions 'SAAS only' as a usage constraint, but does not provide guidance on when to use pause versus stop or resume, nor when to set force=True. No explicit alternatives or exclusions are given.

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

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