Filter result check

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

Checks an exact claimed decimal filter result with source-order witnesses.

Use when you need to: check filter result · validate filtered selection · audit source order filter.

Decide before calling

Read the versioned contract and the supported scope below. Reuse filter-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 filter-result-check@1.0.0 for check filter 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 filter result
• validate filtered selection
• audit source order filter
• check filter witnesses
• compare claimed filter output
• verify exact predicate selection

Not supported

• does not return a repaired result
• does not evaluate JavaScript callbacks

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.
• Exact decimal strings are compared without binary floating point; numeric equality ignores trailing fractional zeroes.
• Filter witnesses must contain every matching source item exactly once in ascending source index; null fails ordered comparisons.

Input

• source (array of string or null, required): max items 10000
• predicate (object, 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",
    "1",
    "2.0"
  ],
  "predicate": {
    "op": "gte",
    "value": "2"
  },
  "claimed": [
    {
      "source_index": 0,
      "value": "2"
    },
    {
      "source_index": 2,
      "value": "2.0"
    }
  ]
}

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": "filter-result-check",
  "version": "1.0.0",
  "input": {
    "source": [
      "2",
      "1",
      "2.0"
    ],
    "predicate": {
      "op": "gte",
      "value": "2"
    },
    "claimed": [
      {
        "source_index": 0,
        "value": "2"
      },
      {
        "source_index": 2,
        "value": "2.0"
      }
    ]
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/filter-result-check/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"source":["2","1","2.0"],"predicate":{"op":"gte","value":"2"},"claimed":[{"source_index":0,"value":"2"},{"source_index":2,"value":"2.0"}]}'

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

CLI

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

Get the client at /clients/cli/.

Related tools

• 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.
• Stable sort result check: Check that a claimed record result is the exact ascending stable sort of the supplied source records.
• Partition result check: Checks both sides of a claimed stable decimal partition with source witnesses.
• Coloring count check: Check a proper indexed coloring and an exact canonical-decimal claim for its number of distinct colors.