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context_list

Read-only

List all Docker CLI contexts available on the host, showing name, description, endpoint, and which is currently active.

Instructions

List Docker CLI contexts known to the host running this MCP server.

Contexts are a CLI concept (stored in the docker config dir) letting one CLI target multiple daemons. This server uses whatever DOCKER_HOST / current-context resolved to at startup, so changing contexts only affects future subprocess-based tools, not the docker-py SDK client. Use context_inspect for one context's full config and context_use to switch. Raises RuntimeError if the CLI call fails.

returns: list - One dict per context with at least name, description, dockerEndpoint, and current

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior4/5

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

Annotations already indicate readOnlyHint=true. The description adds useful context on CLI concept, runtime behavior, and error condition (RuntimeError), but is not strictly necessary beyond annotations.

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

Conciseness4/5

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

Description is well-structured and informative with 5 sentences. Slightly verbose but clearly conveys purpose, usage, and return format.

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

Completeness5/5

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

Completely describes the tool's purpose, behavioral nuances, return format, and error handling. No gaps given zero parameters and no output schema.

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?

No parameters; schema coverage is 100%. The description adds no param info, but none is needed. Baseline for 0 params is 4.

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 tool lists Docker CLI contexts and distinguishes it from siblings like context_inspect and context_use.

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

Usage Guidelines5/5

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

Explicitly states the tool's scope (contexts known to the host), notes the server's fixed context at startup, and directs to context_inspect for full config and context_use to switch.

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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