CAIN-42 invariant · E28

E28-I53: an omitted dimension is inherited, never widened

Held · CAIN-42 Evolution 28 -- Portable Machine Agency & Execution Identity

Last reviewed 2026-10-01

held   niche Identity, authority & delegation · family delegation

What this rule means

CAIN-42 must always satisfy: an omitted dimension is inherited, never widened. It is one of 90 invariants checked for CAIN-42 Evolution 28 -- Portable Machine Agency & Execution Identity. An invariant is a rule the system may never break, whatever an agent or attacker does; the test suite tries to break it across many scenarios and records the result.

Recorded detail

{'capabilities': ['read'], 'resources': ['docs/'], 'tools': ['*'], 'data_scopes': ['internal'], 'org_scopes': ['self'], 'regions': ['eu', 'us'], 'max_transaction_value': 10000, 'economic_budget': 100000, 'max_executions': 1000, 'risk_ceilin

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Check it yourself

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Related rules

• E28-I33: a key already bound to an identity cannot register again (clone)
• E28-I35: declaring an unregistered capability is refused
• E28-I52: an unknown delegation dimension is refused
• E28-I54: a parent without downstream delegation cannot delegate
• E28-I55: delegation beyond max depth is refused
• E28-I56: a child cannot outlive its parent
• E28-I57: a tampered delegation token is detected in the chain
• E28-I58: revoking a delegation revokes every descendant token

← E28-I52 · all 90 · E28-I54 →