Topk result check

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

Checks a claimed exact-decimal top-k ranking with deterministic source-index ties.

Use when you need to: check top k result · validate largest selections · validate smallest selections.

Decide before calling

Read the versioned contract and the supported scope below. Reuse topk-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 topk-result-check@1.0.0 for check top k 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 top k result
• validate largest selections
• validate smallest selections
• audit top k witnesses
• check ranked claim
• compare claimed top k

Not supported

• does not approximate numeric values
• does not silently fill missing ranks

Behavior

• If the complete first-discrepancy verdict would exceed 4,096 UTF-8 JSON bytes, the tool throws limit_exceeded instead of truncating, omitting, or repairing either witness.
• Values are exact decimal strings; ranking is numeric and equal numeric values tie by ascending source index.
• The claim has exactly k witnesses in rank order; source values must not be null.

Input

• source (array of string, required): max items 10000
• k (integer, required): min 0; max 10000
• direction (one of "largest", "smallest", required)
• claimed (array of object, required): max items 10000

Output

• valid (boolean, required)
• reason (string, optional)
• discrepancy (object, optional)
• reference_version (string, required)

Limits

• max items: 10000
• max input bytes: 1000000
• max output bytes: 4096

Example

Request input:

{
  "source": [
    "2",
    "10",
    "10.0"
  ],
  "k": 2,
  "direction": "largest",
  "claimed": [
    {
      "source_index": 1,
      "value": "10"
    },
    {
      "source_index": 2,
      "value": "10.0"
    }
  ]
}

Response:

{
  "result": {
    "valid": true,
    "reference_version": "ECMA-262-2026-Array-iteration-order+Hoare-1961-selection-invariants"
  }
}

How to call it

MCP

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

{
  "id": "topk-result-check",
  "version": "1.0.0",
  "input": {
    "source": [
      "2",
      "10",
      "10.0"
    ],
    "k": 2,
    "direction": "largest",
    "claimed": [
      {
        "source_index": 1,
        "value": "10"
      },
      {
        "source_index": 2,
        "value": "10.0"
      }
    ]
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/topk-result-check/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"source":["2","10","10.0"],"k":2,"direction":"largest","claimed":[{"source_index":1,"value":"10"},{"source_index":2,"value":"10.0"}]}'

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

CLI

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

Get the client at /clients/cli/.

Related tools

• Dedupe first check: Check an exact first-wins SameValueZero deduplication claim and report its first discrepancy.
• Dedupe keyed check: Check an exact keyed Map deduplication claim and report its first discrepancy.
• Dedupe last check: Check an exact last-wins SameValueZero deduplication claim and report its first discrepancy.
• Filter result check: Checks an exact claimed decimal filter result with source-order witnesses.
• Multiset difference check: Check claimed left-only and right-only scalar bag differences in deterministic source order.
• Partition result check: Checks both sides of a claimed stable decimal partition with source witnesses.