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TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140import type { Agent } from "agents";import * as Effect from "effect/Effect";import { capabilityPolicyUpdate, capabilityReference, capabilitySourceKey, effectiveCapabilityPolicy, type CapabilityMetadata, type CapabilityPolicySnapshot, type CapabilityReference,} from "../shared/capability-policy";import { AgentFailure, agentValidation } from "./agent-io";import { diagnosticId, type DiagnosticStore } from "./diagnostics";
export class CapabilityPolicyStore { constructor( private readonly sql: Agent["sql"], private readonly storage: Pick<DurableObjectStorage, "transactionSync">, ) {} initialize() { this .sql`CREATE TABLE IF NOT EXISTS flarebot_capability_policy (singleton INTEGER PRIMARY KEY CHECK(singleton = 1), document TEXT NOT NULL)`; this .sql`INSERT OR IGNORE INTO flarebot_capability_policy VALUES (1, ${JSON.stringify({ revision: 0, defaultPolicy: "ask", sourceOverrides: [] })})`; } read(): CapabilityPolicySnapshot { const [row] = this.sql<{ document: string; }>`SELECT document FROM flarebot_capability_policy WHERE singleton = 1`; return capabilityPolicyUpdate.parse(JSON.parse(row.document)); } // Retiring a source also invalidates editors that have not yet saved its // first override. Read the current document inside the caller's transaction. removeSources(sources: readonly CapabilityReference["source"][]) { const keys = new Set(sources.map(capabilitySourceKey)); return this.storage.transactionSync(() => { const current = this.read(); return this.update({ ...current, sourceOverrides: current.sourceOverrides.filter( (entry) => !keys.has(capabilitySourceKey(entry.source)), ), }); }); } update(value: unknown): CapabilityPolicySnapshot { const input = capabilityPolicyUpdate.parse(value); return this.storage.transactionSync(() => { if (this.read().revision !== input.revision) throw new Error("Capability policy changed. Reload before saving."); const updated = capabilityPolicyUpdate.parse({ ...input, revision: input.revision + 1, }); this .sql`UPDATE flarebot_capability_policy SET document = ${JSON.stringify(updated)} WHERE singleton = 1`; return updated; }); }}
export class CapabilityDenied extends AgentFailure { constructor(readonly decision: "ask" | "never" | "unavailable") { super({ message: decision === "ask" ? "Owner approval is required for this capability" : decision === "never" ? "This capability is prohibited by owner policy" : "This capability changed or is unavailable", }); }}
// The resolver and operation are trusted server code. The caller supplies only// an identity/fingerprint, never policy, provenance, approval or executable code.export function runCapability<A, E>( context: { policy: CapabilityPolicyStore; resolve: (reference: CapabilityReference) => CapabilityMetadata | undefined; diagnostics: DiagnosticStore; conversationId?: string; toolCallId?: string; approvedOnce?: boolean; }, value: unknown, operation: (metadata: CapabilityMetadata) => Effect.Effect<A, E>,): Effect.Effect<A, E | AgentFailure> { return Effect.gen(function* () { const reference = yield* agentValidation(() => capabilityReference.parse(value), ); const metadata = context.resolve(reference); const configuration = context.policy.read(); const current = metadata?.enabled && metadata.id === reference.id && metadata.fingerprint === reference.fingerprint && metadata.source.kind === reference.source.kind && metadata.source.id === reference.source.id; const effective = current ? effectiveCapabilityPolicy(metadata, configuration) : null; const decision = effective?.policy ?? "unavailable"; context.diagnostics.record({ kind: "approval", timestamp: Date.now(), id: diagnosticId(context.toolCallId), conversationId: diagnosticId(context.conversationId), requestId: null, phase: "transition", status: decision === "allow" || (decision === "ask" && context.approvedOnce === true) ? "succeeded" : decision === "ask" ? "pending" : "skipped", durationMs: null, details: { capabilityId: diagnosticId(reference.id), capabilitySourceId: diagnosticId(reference.source.id), capabilitySourceKind: reference.source.kind, approvalDecision: decision, policyRevision: configuration.revision, policySource: effective?.source, }, }); if ( (decision !== "allow" && !(decision === "ask" && context.approvedOnce === true)) || !metadata ) return yield* Effect.fail( new CapabilityDenied(decision === "allow" ? "unavailable" : decision), ); return yield* operation(metadata); });}