/**
 * context-ledger/gates.ts — L2: the ledger's rows feed what gets included.
 *
 * Three gates, one policy, each hooking an EXISTING seam (no new framework
 * surface): `gatedTools(inner, predicate)` for tools, `skillGraph().entryBy`
 * for skills, and a rule-trigger wrapper for injections.
 *
 * THE POLICY PRINCIPLE — demote, never starve: a piece the ledger judges
 * poorly is demoted, but every `refreshEvery`-th decision lets it through
 * anyway ("parole"), so it keeps generating fresh ledger data. Without
 * parole a piece demoted once could never earn again — a self-fulfilling
 * verdict. And the ledger never judges a piece it barely knows: below
 * `minOffers` everything passes.
 */
import type { EntryScorer } from '../injection-engine/entryScorer.js';
import type { Injection } from '../injection-engine/types.js';
import type { ToolGatePredicate } from '../../tool-providers/types.js';
import type { ContextLedger } from './types.js';
/**
 * When the ledger is allowed to judge, and how harshly.
 * Plain-named knobs — a bookkeeper's rules, not ML hyperparameters.
 */
export interface LedgerPolicy {
    /** Don't judge a piece until it has been offered this many times. Default 5. */
    readonly minOffers?: number;
    /** Demote below this used÷offered rate. Default 0.05 (essentially "never used"). */
    readonly earnRateFloor?: number;
    /**
     * Parole: let a demoted piece through anyway every Nth demotion decision,
     * so it keeps earning fresh data. Default 10. `Infinity` disables parole
     * (NOT recommended — a starved piece can never redeem itself).
     */
    readonly refreshEvery?: number;
}
/**
 * TOOL GATE — plug into the existing provider combinator:
 *
 * ```ts
 * import { gatedTools, staticTools } from 'agentfootprint/tool-providers';
 * builder.toolProvider(gatedTools(staticTools(tools), ledgerToolGate(ledger)));
 * ```
 *
 * Unused tool schemas are usually the biggest silent token cost — this is
 * the gate to start with.
 */
export declare function ledgerToolGate(ledger: ContextLedger, policy?: LedgerPolicy): ToolGatePredicate;
/**
 * SKILL GATE — an `EntryScorer` for `skillGraph().entryBy(...)` that wraps
 * another scorer (keyword, embedding, …) and demotes candidates the ledger
 * says never earn. Demotion multiplies the inner score toward the floor —
 * ranking pressure, not exclusion — and parole restores full weight
 * periodically, so a demoted skill can still win when nothing else fits.
 */
export declare function ledgerEntryScorer(ledger: ContextLedger, inner: EntryScorer, policy?: LedgerPolicy): EntryScorer;
/**
 * INJECTION GATE — wrap ONE injection so the ledger's verdict joins its
 * trigger. `always` becomes a ledger-backed rule; an existing `rule` is
 * AND-ed with the verdict. `on-tool-return` / `llm-activated` are returned
 * UNCHANGED (they are already demand-driven — the ledger has nothing to
 * add). `always` pieces are exempt unless you explicitly wrap them — the
 * safety-first default from the design.
 */
export declare function ledgerGated(injection: Injection, ledger: ContextLedger, policy?: LedgerPolicy): Injection;
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