FA-99831 / Tool call schema validation / Open access

Dependent required condition is triggered by absent key · case 01

Dependent required condition is triggered by absent key.

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

ROOT CAUSE

The dependency rule is applied in the reverse direction.

THE FAILURE

The dependency rule is applied in the reverse direction.

Unsuccessful approach: Requiring dependencies unconditionally rejects valid objects without the trigger.

Case contract

If trigger is present, every dependency key must also be present; without trigger the object is valid.

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(obj, trigger, dependencies):
    return all(k in obj for k in dependencies) if trigger not in obj else True
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('trigger with dependencies',solve({'a':1,'b':0},'a',['b']),True)
check('trigger missing dependency',solve({'a':1},'a',['b']),False)
check('no trigger',solve({'b':1},'a',['b']),True)
check('no trigger no deps',solve({},'a',['b']),True)
check('trigger empty deps',solve({'a':None},'a',[]),True)
check('one missing among many',solve({'a':1,'b':2},'a',['b','c']),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
trigger with dependencies	`True`	`True`	Passed
trigger missing dependency	`True`	`False`	Failed
no trigger	`True`	`True`	Passed
no trigger no deps	`False`	`True`	Failed
trigger empty deps	`True`	`True`	Passed
one missing among many	`True`	`False`	Failed

SHA-256 / 6788fef5185a40c8bc3e9d759f04bfe33cb0378b04014e15aec10dec55e1bd94

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(obj, trigger, dependencies):
    return all(k in obj for k in dependencies)
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('trigger with dependencies',solve({'a':1,'b':0},'a',['b']),True)
check('trigger missing dependency',solve({'a':1},'a',['b']),False)
check('no trigger',solve({'b':1},'a',['b']),True)
check('no trigger no deps',solve({},'a',['b']),True)
check('trigger empty deps',solve({'a':None},'a',[]),True)
check('one missing among many',solve({'a':1,'b':2},'a',['b','c']),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
trigger with dependencies	`True`	`True`	Passed
trigger missing dependency	`False`	`False`	Passed
no trigger	`True`	`True`	Passed
no trigger no deps	`False`	`True`	Failed
trigger empty deps	`True`	`True`	Passed
one missing among many	`False`	`False`	Passed

SHA-256 / eabb185ebd2d521f5e22104c552183205972e68cc77ec8f36b1648a10750e3ec

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 2026-09-30T16:48:28.523289+00:00.

Case digest / f84caab9884e596043cae834375917790170acb9e102a2fa0020bf1c165a08cf