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jim-coyne

Hyperfabric MCP Server

nodesUpdateNodeLoopback

Modify loopback interface configuration on a network node by updating IP addresses, annotations, labels, or descriptions to manage network connectivity and routing.

Instructions

Update a specific loopback.

To use this tool, pass the resource ID and the fields to update as arguments

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
fabricIdYesThis is a read-only field. The unique identifier of the fabric to which this loopback belongs to.
nodeIdYesThis is a read-only field. The unique identifier of the node to which this loopback belongs to.
loopbackIdYesThe loopback id or name.
annotationsNoA list of name-value annotations to store user-defined data including complex data such as JSON associated with the loopback.
autoCreatedNoThis is a read-only field. A flag that indicates if the loopback was automatically created by the system.
descriptionNoThe description is a user-defined field to store notes about the loopback.
idNoThis is a read-only field. The unique identifier of the loopback of the node in the fabric.
ipv4AddressNoThe IPv4 host address with subnet mask to be configured on the loopback.
ipv6AddressNoThe IPv6 host address with subnet mask to be configured on the loopback.
labelsNoA list of user-defined labels that can be used for grouping and filtering loopbacks.
metadataNoMetadata defines a map of attributes related to the lifecycle of the object.
nameNoThe name of the loopback. Must be in the format Loopback\<Integer\>.
vrfIdNoThe unique identifier of the VRF to which this loopback is attached to.
Behavior2/5

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

No annotations are provided, so the description must fully disclose behavioral traits. It mentions 'Update' but fails to explain critical aspects: whether this is a mutation (implied but not explicit), what permissions are required, if changes are reversible, how conflicts are handled, or what the response looks like. For a tool with 13 parameters and no annotations, this is a significant gap.

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 concise with two sentences that are front-loaded and waste no words. However, it under-specifies by omitting necessary context, which slightly reduces its effectiveness despite the efficient structure.

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

Completeness2/5

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

Given the complexity (13 parameters, nested objects, no output schema, and no annotations), the description is incomplete. It lacks guidance on usage, behavioral details, error handling, and output expectations, making it inadequate for a mutation tool in a network management context.

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

Parameters3/5

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 parameters thoroughly. The description adds no additional meaning beyond implying that 'resource ID' and 'fields to update' are needed, which is redundant with the schema. This meets the baseline for high schema coverage.

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

Purpose4/5

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

The description clearly states the verb ('Update') and resource ('a specific loopback'), making the purpose immediately understandable. It doesn't distinguish from sibling tools like 'nodesUpdateNodeSubInterface' or 'nodesUpdateFabricNode', but the specificity of 'loopback' is adequate for basic clarity.

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 minimal usage guidance, stating only to 'pass the resource ID and the fields to update as arguments'. It offers no context on when to use this tool versus alternatives (e.g., 'nodesAddNodeLoopbacks' for creation, 'nodesDeleteNodeLoopback' for deletion) or any prerequisites, leaving the agent with insufficient direction.

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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