FA-99756 / Tool call schema validation / Open access

Boolean values pass an integer field · case 01

Boolean values pass an integer field.

Verified by executionVariant 1 · 6 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

A broad integer instance check includes booleans.

THE FAILURE

A broad integer instance check includes booleans.

Unsuccessful approach: Special-casing True rejects that boolean but continues to accept False as an integer.

Case contract

An integer field accepts exact Python ints and rejects bool despite bool being an int subclass.

Why this case matters

Tool argument validation prevents malformed structured payloads from entering a deterministic downstream operation.

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(value):
    return isinstance(value,int)
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('variant integer',solve(N),True)
check('negative integer',solve(-N),True)
check('true is not integer',solve(True),False)
check('false is not integer',solve(False),False)
check('integral float',solve(2.0),False)
check('string digits',solve('2'),False)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
variant integer	`True`	`True`	Passed
negative integer	`True`	`True`	Passed
true is not integer	`True`	`False`	Failed
false is not integer	`True`	`False`	Failed
integral float	`False`	`False`	Passed
string digits	`False`	`False`	Passed

SHA-256 / 15d831a5700df7777831da4ff95aed271b04ca3f31ef94eeba8dc66b5124ea1f

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(value):
    return type(value) is int or value is True
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('variant integer',solve(N),True)
check('negative integer',solve(-N),True)
check('true is not integer',solve(True),False)
check('false is not integer',solve(False),False)
check('integral float',solve(2.0),False)
check('string digits',solve('2'),False)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
variant integer	`True`	`True`	Passed
negative integer	`True`	`True`	Passed
true is not integer	`True`	`False`	Failed
false is not integer	`False`	`False`	Passed
integral float	`False`	`False`	Passed
string digits	`False`	`False`	Passed

SHA-256 / 2bc51179f6536e947cb150fca301c2f911094e46573c34ac0169d087f9fd9c0e

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 6 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

Member access is invitation-based. Sign in with your invited account to inspect the repair.

Verification & scope

Self-contained toy JSON-like schema contract over in-memory Python values; no compatibility with a production schema standard or callable binding is claimed. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-30T16:48:27.645841+00:00.

Case digest / 8249f7d0c51b5485fc9a727f431003a6601c2cee23d30fc9611c7cf2ce1e63dc