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init_swarm

Initialize a new Docker Swarm cluster on the Engine. Configure advertise address, listen address, networking, and security options for the swarm manager.

Instructions

Initialize a new swarm on this Engine.

args: advertise_addr - Externally reachable address advertised to other nodes listen_addr - Listen address used for inter-manager communication force_new_cluster - Force a new cluster from current state default_addr_pool - IP address pools for swarm overlay networks subnet_size - Subnet size for the IP pool data_path_addr - Address to use for data path traffic data_path_port - Port number for data path traffic name - Name of the swarm labels - User-defined key/value metadata autolock_managers - Encrypt manager keys at rest log_driver - Default log driver configuration returns: str - The node id of the newly created swarm manager

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameNo
labelsNo
log_driverNo
listen_addrNo0.0.0.0:2377
subnet_sizeNo
advertise_addrNo
data_path_addrNo
data_path_portNo
autolock_managersNo
default_addr_poolNo
force_new_clusterNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

Annotations already declare destructiveHint false and readOnlyHint false. The description adds that a new swarm is initialized and returns a node ID, but lacks details on side effects, required permissions, or state changes. It meets a basic level but does not exceed the information already available.

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?

The description is structured with a clear purpose line and a list of parameters. While it is somewhat lengthy due to 11 parameter entries, each entry is concise and necessary. The format is front-loaded and easy to parse.

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?

The description covers the return type and parameter meanings, but lacks context about preconditions (e.g., engine not already a swarm), idempotency, or error scenarios. Given the complexity (11 params, no required, no output schema), the description is adequate but not fully complete.

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

Parameters5/5

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

The input schema has no descriptions (0% coverage), so the description's parameter list with brief explanations adds essential meaning. Each of the 11 parameters is described, fully compensating for the schema's lack of documentation.

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 'Initialize a new swarm on this Engine' using a specific verb and resource. It distinguishes the tool from sibling tools like join_swarm, leave_swarm, and update_swarm.

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

Usage Guidelines2/5

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 does not mention prerequisites, scenarios where init_swarm is preferred over join_swarm, or potential conflicts.

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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