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chaandannn

nable (finops-mcp)

estimate_helm_diff_cost

Estimate the monthly cost impact of Helm diff changes including replica count, CPU/memory requests, instance type, and node count. Input a helm diff upgrade output or git diff.

Instructions

Estimate the monthly cost impact of a helm diff or values.yaml change. Handles replicaCount, CPU/memory requests, instanceType, and nodeCount changes.

Paste the output of helm diff upgrade or a values.yaml git diff.

Examples: - "How much will this helm diff cost?" - "What's the cost impact of scaling from 3 to 10 replicas?" - "Estimate cost of upgrading this node pool instance type"

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
diff_textYes
release_nameNounknown
current_replicasNo
current_cpu_requestNo100m
current_memory_requestNo128Mi
Behavior2/5

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

No annotations are provided, so the description carries full responsibility for behavioral disclosure. It mentions handling replicaCount, CPU/memory requests, instanceType, and nodeCount changes, but does not disclose limitations, assumptions, error handling, or required pricing data. This is insufficient for a tool with no annotation support.

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 concise and front-loaded with the core purpose. It uses bullet points and examples efficiently, with no wasted words. Every sentence adds value.

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 primary use case and provides examples, but it lacks details on output format, handling of optional parameters, and edge cases. Given the 5-parameter schema and no output schema, the description is somewhat incomplete but sufficient for basic usage.

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

Parameters2/5

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

Schema description coverage is 0%, yet the description only explains 'diff_text' implicitly. Other parameters like 'release_name', 'current_replicas', 'current_cpu_request', and 'current_memory_request' are not explained. The description mentions handling instanceType and nodeCount, but these are not in the schema, causing confusion. The description adds some value but fails to compensate for the lack of schema descriptions.

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 explicitly states the tool estimates monthly cost impact of helm diffs or values.yaml changes. It specifies the action (estimate) and resource (helm diff/values.yaml), and it distinguishes from sibling tools like estimate_terraform_cost and estimate_change_cost by focusing on helm-specific changes.

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

Usage Guidelines4/5

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

The description provides clear examples of when to use the tool (e.g., 'How much will this helm diff cost?') and instructs users to paste specific outputs ('helm diff upgrade' or values.yaml git diff). However, it does not explicitly state when not to use it or mention alternative tools.

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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