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MCP Vibe Coding Tools

MCP Vibe Coding Tools

by ammilam
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TypeScript
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gcloud_iam_service_accounts_keys_create

Create a new key for a Google Cloud service account by specifying the service account email and a file path to save the key.

Instructions

Create a new key for a service account

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "service_account": "<service_account>",
      "key_file": "<key_file>"
    },
    "name": "gcloud_iam_service_accounts_keys_create"
  }
}

Input Schema

NameRequiredDescriptionDefault
key_fileYesPath where the key file should be saved
service_accountYesService account email

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3/5.0
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 only states 'create a new key' without explaining side effects (e.g., generation of a private key, writing to disk, potential overwriting), security implications, or required IAM roles. This is insufficient for safe and predictable use.

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

Conciseness3/5

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

The description is a single sentence of 8 words, which is concise but not appropriately sized. It states the purpose but omits necessary behavioral and usage context. Every sentence should earn its place; this one does for purpose, but the description is incomplete, so it cannot be scored higher.

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 security-sensitive nature of creating a service account key, the description is too sparse. There is no output schema, no explanation of what the key file contains or how it should be handled, and no mention of authentication or authorisation requirements. The agent lacks critical information for safe invocation.

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% (both parameters have descriptions in the schema). The tool description adds no additional meaning beyond the schema. Baseline 3 is appropriate as the schema already documents the parameters, but the tool description does not enrich understanding of parameter values or constraints.

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 'Create a new key for a service account' clearly states the verb (create) and resource (key for a service account). It is specific and distinguishes itself from sibling tools like gcloud_iam_service_accounts_list (list accounts) and gcloud_execute (generic command execution). There is no ambiguity about what the tool does.

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, required permissions, or scenarios where a different tool (e.g., gcloud_execute for manual key creation) would be more appropriate. The agent is left without context for correct invocation.

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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