Stable sort result check

stable-sort-result-check · version 1.0.0 · Numbers & math · free, no key needed

Check that a claimed record result is the exact ascending stable sort of the supplied source records.

Use when you need to: check stable sorted result · validate claimed stable sort output · compare records with stable sort.

Decide before calling

Read the versioned contract and the supported scope below. Reuse stable-sort-result-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 stable-sort-result-check@1.0.0 for check stable sorted result. 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

• check stable sorted result
• validate claimed stable sort output
• compare records with stable sort
• detect first stable sorting discrepancy
• check equal key record order
• verify exact sorted record claim

Not supported

• sort records for the caller
• compare floating point or locale text keys

Behavior

• Keys are canonical base-10 integer strings; negative zero is rejected, and null follows every integer.
• Equal keys retain source index order, as required by ECMA-262 Array.prototype.sort stability; ids are unique and records must match exactly.
• The first mismatch is reported at the lowest claimed-result index; the claim is never repaired.
• Every verdict names ECMA-262-2026-draft-Array.prototype.sort.

Input

• source (array of object, required): min items 1; max items 4096
• claimed_result (array of object, required): min items 1; max items 4096

Output

• valid (boolean, required)
• reason (string, optional): min length 1; max length 80
• discrepancy (object, optional)
• reference_version (constant "ECMA-262-2026-draft-Array.prototype.sort", required)

Limits

• max items: 4096
• max key chars: 40
• max id chars: 80

Example

Request input:

{
  "source": [
    {
      "id": "a",
      "key": "2"
    },
    {
      "id": "b",
      "key": "1"
    }
  ],
  "claimed_result": [
    {
      "id": "b",
      "key": "1"
    },
    {
      "id": "a",
      "key": "2"
    }
  ]
}

Response:

{
  "result": {
    "valid": true,
    "reference_version": "ECMA-262-2026-draft-Array.prototype.sort"
  }
}

How to call it

MCP

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

{
  "id": "stable-sort-result-check",
  "version": "1.0.0",
  "input": {
    "source": [
      {
        "id": "a",
        "key": "2"
      },
      {
        "id": "b",
        "key": "1"
      }
    ],
    "claimed_result": [
      {
        "id": "b",
        "key": "1"
      },
      {
        "id": "a",
        "key": "2"
      }
    ]
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/stable-sort-result-check/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"source":[{"id":"a","key":"2"},{"id":"b","key":"1"}],"claimed_result":[{"id":"b","key":"1"},{"id":"a","key":"2"}]}'

The machine-readable contract is at /v1/tools/stable-sort-result-check/versions/1.0.0.

CLI

node cli.mjs run stable-sort-result-check 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.

Related tools

• Stable sort groups check: Check claimed equal-key groups for exact key order, membership, and stable source order.
• Stable sort indices check: Check that claimed source indices are the exact ascending stable order for supplied integer keys.
• Join inner result check: Check a claimed ordered inner join index result and report its first discrepancy.
• Join left result check: Check a claimed ordered left join index result and report its first discrepancy.
• Join semi result check: Check a claimed ordered semi-join index result and report its first discrepancy.
• Filter result check: Checks an exact claimed decimal filter result with source-order witnesses.