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101 lines
2.7 KiB
Lean4
101 lines
2.7 KiB
Lean4
/-
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LeanCTX Formal Verification Layer — Core Types
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Mirrors the Rust types from:
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- rust/src/core/context_field.rs (ContextState, ContextItemId)
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- rust/src/core/context_policies.rs (PolicyAction, PolicyCondition, ContextPolicy)
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- rust/src/core/budget_tracker.rs (BudgetLevel)
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These definitions form the foundation for all proofs in the LeanCTX
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formal verification layer. They are intentionally simplified models
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of the Rust production code — the gap is validated via differential
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random testing (DRT), following Amazon Cedar's methodology.
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Reference: arXiv:2407.01688 (Verification-Guided Development of Cedar)
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-/
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/-- Context item lifecycle states. Mirrors `ContextState` in context_field.rs. -/
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inductive ContextState where
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| candidate
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| included
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| excluded
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| pinned
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| stale
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| shadowed
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deriving DecidableEq, Repr
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/-- Policy actions that transform context item state. Mirrors `PolicyAction`. -/
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inductive PolicyAction where
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| exclude
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| include
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| pin
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| setView (view : String)
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| maxTokens (limit : Nat)
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| markOutdated
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deriving DecidableEq, Repr
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/-- Conditions under which a policy applies. Mirrors `PolicyCondition`. -/
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inductive PolicyCondition where
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| sourceSeenBefore
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| sourceModifiedRecently
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| tokensAbove (threshold : Nat)
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| always
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deriving DecidableEq, Repr
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/-- Budget enforcement levels. Mirrors `BudgetLevel`. -/
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inductive BudgetLevel where
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| ok
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| warning
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| exhausted
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deriving DecidableEq, Repr
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/-- A context item with its current state and metadata. -/
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structure ContextItem where
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id : String
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path : String
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state : ContextState
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tokenCount : Nat
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seenBefore : Bool
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deriving DecidableEq, Repr
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/-- A declarative context policy rule. Mirrors `ContextPolicy`. -/
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structure ContextPolicy where
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name : String
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matchPattern : String
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action : PolicyAction
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condition : Option PolicyCondition
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deriving Repr
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/-- A set of policies. Mirrors `PolicySet`. -/
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structure PolicySet where
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policies : List ContextPolicy
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deriving Repr
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/-- Scope definition for agent access control. -/
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structure Scope where
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allowedPrefixes : List String
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deriving DecidableEq, Repr
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/-- Agent identity with scope restrictions. -/
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structure Agent where
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id : String
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scope : Scope
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deriving Repr
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/-- Budget configuration. -/
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structure BudgetConfig where
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maxTokens : Nat
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warnAtPercent : Nat
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blockAtPercent : Nat -- 255 = never block (LeanCTX default)
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deriving DecidableEq, Repr
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/-- A context reference used in handoffs and context compilation. -/
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structure ContextRef where
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itemId : String
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deriving DecidableEq, Repr
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/-- The compiled context — the final output sent to the LLM. -/
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structure CompiledContext where
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items : List ContextItem
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deriving Repr
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