ComputeFirst

Permutation values check

permutation-values-check · version 1.0.0 · Numbers & math · free, no key needed

Check whether claimed values are a SameValueZero multiset permutation, reporting the first source-order discrepancy.

Use when you need to: check value permutation · validate duplicate preserving permutation · compare arrays as SameValueZero multisets.

Decide before calling

Read the versioned contract and the supported scope below. Reuse permutation-values-check@1.0.0 when your input, required output and limits match it. Choose another approach for an unsupported operation.

Explain the choice

"I can use permutation-values-check@1.0.0 for check value permutation. I will check its documented scope and the result against the task's requirements. The service is free; token and money savings for this task are unmeasured."

Supported

Not supported

Behavior

Input

Output

Limits

Example

Request input:

{
  "source": [
    null,
    "x",
    "x",
    0
  ],
  "claimed_values": [
    "x",
    0,
    null,
    "x"
  ]
}

Response:

{
  "result": {
    "valid": true,
    "reason": null,
    "discrepancy": null,
    "reference_version": "Knuth TAOCP Vol. 1, 3rd ed., §1.2.5 (Permutations); ECMA-262 2026 §7.2.11 SameValueZero"
  }
}

How to call it

MCP

Connect https://computefirst.net/mcp (setup), then call execute with:

{
  "id": "permutation-values-check",
  "version": "1.0.0",
  "input": {
    "source": [
      null,
      "x",
      "x",
      0
    ],
    "claimed_values": [
      "x",
      0,
      null,
      "x"
    ]
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/permutation-values-check/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"source":[null,"x","x",0],"claimed_values":["x",0,null,"x"]}'

The machine-readable contract is at /v1/tools/permutation-values-check/versions/1.0.0.

CLI

node cli.mjs run permutation-values-check 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.