Decode flow definitions with schema

ts/EFFECT_NATIVE_REWRITE_AUDIT.md

@@ -12,8 +12,8 @@ Verified source roots:
 - Effect v4 subtree: `/home/elpresidank/YeeBois/projects/beep-effect2/.repos/effect-v4`
 - Installed Effect beta used by this workspace: `ts/node_modules/effect`
 
-Current signal counts from `ts/packages` after the 2026-06-02 Base processor
+Current signal counts from `ts/packages` after the 2026-06-02 Base flow
-compatibility runtime slice:
+definition schema slice:
 
 | Signal | Count |
 | --- | ---: |
@@ -65,6 +65,9 @@ Notes:
 - The base processor compatibility runtime slice dropped the
   `Effect.runPromise` count again by moving `AsyncProcessor`, `Flow`, and
   `FlowProcessor` Promise compatibility facades onto `ManagedRuntime`.
+- The base flow definition schema slice removed hand-rolled
+  `Predicate`/object narrowing from `flow-processor.ts`; signal counts are
+  unchanged because this was a validation-quality migration.
 - `Record<string, any>` and `throwLibrarianServiceError` are now clean in
   `ts/packages`.
 
@@ -520,6 +523,26 @@ Notes:
   - `cd ts && bun run build`
   - `cd ts && bun run test`
 
+### 2026-06-02: Base Flow Definition Schema Slice
+
+- Status: migrated and root-verified.
+- Completed:
+  - `ts/packages/base/src/processor/flow-processor.ts` now validates
+    `config.flows` with Effect Schema instead of local
+    `Predicate`/object/string-record guards.
+  - Invalid flow definition payloads still log/skip and preserve the existing
+    config-handler and acknowledgement behavior.
+  - `ts/packages/base/src/__tests__/flow-processor-runtime.test.ts` now covers
+    an invalid nested flow definition that is acknowledged without starting
+    resources.
+- Verification:
+  - `bun run --cwd ts/packages/base test -- src/__tests__/flow-processor-runtime.test.ts`
+  - `bun run --cwd ts/packages/base build`
+  - `cd ts && bun run check`
+  - `cd ts && bun run build`
+  - `cd ts && bun run test`
+  - `git diff --check`
+
 ## Subagent Findings To Preserve
 
 - MCP/workbench:
@@ -568,11 +591,10 @@ Notes:
 
 ## Ranked Findings
 
-### P1: Base Flow Definition Schemas And Typed Spec Accessors
+### P1: Base Typed Spec Accessors
 
 - TrustGraph evidence:
   - `ts/packages/base/src/processor/flow.ts`
-  - `ts/packages/base/src/processor/flow-processor.ts`
   - `ts/packages/base/src/spec/parameter-spec.ts`
   - `ts/packages/base/src/spec/producer-spec.ts`
   - `ts/packages/base/src/spec/request-response-spec.ts`
@@ -580,8 +602,6 @@ Notes:
   - Schema-backed registries, `Context`, `Layer`, `Effect.fn`, `Option`,
     `Predicate`, `HashMap`/`MutableHashMap`.
 - Rewrite shape:
-  - Replace hand-rolled `isStringRecord` / `isFlowDefinition` narrowing with
-    Schema decoding plus `Option`/`Match`-style branches.
   - Add schema-backed generic parameter specs and spec-object accessors such as
     `flow.parameterEffect(spec)`, then keep string accessors as compatibility
     escapes.
@@ -645,7 +665,7 @@ Notes:
 
 ## Recommended PR Order
 
-1. Base flow definition schema decoding and typed spec accessors.
+1. Base typed spec accessors.
 2. Gateway RPC callback and client streaming completion cleanup.
 3. Storage/provider managed resource cleanup.
 4. MCP parity/deletion decision and workbench platform polish.

ts/packages/base/src/__tests__/flow-processor-runtime.test.ts

@@ -136,6 +136,10 @@ class FlowProcessorBackend implements PubSubBackend {
   }
 
   pushConfig(version: number, flows: Record<string, unknown>): void {
+    this.pushFlowConfig(version, flows);
+  }
+
+  pushFlowConfig(version: number, flows: unknown): void {
     this.configConsumer.push(createMessage({ version, config: { flows } }));
   }
 }
@@ -254,4 +258,44 @@ describe("Effect-native FlowProcessor runtime", () => {
       expect(backend.closeCount).toBe(1);
     }),
   );
+
+  it.effect(
+    "schema-decodes flow definitions before starting resources",
+    Effect.fnUntraced(function* () {
+      const backend = new FlowProcessorBackend();
+      const events: Array<string> = [];
+
+      yield* Effect.scoped(
+        Effect.gen(function* () {
+          const fiber = yield* runFlowProcessorDefinitionScoped({
+            id: "schema-flow-processor-test",
+            pubsub: backend,
+            specifications: [makeProducerSpec<string>("output")],
+            configHandlers: [
+              (_config, version) => Effect.sync(() => {
+                events.push(`handler:${version}`);
+              }),
+            ],
+          }).pipe(
+            Effect.provide(MessagingRuntimeLive),
+            Effect.provide(PubSub.layer(backend)),
+            Effect.provide(fastMessagingConfig),
+            Effect.forkChild,
+          );
+
+          yield* waitFor(() => backend.consumerOptions.length === 1, "schema config subscription");
+
+          backend.pushFlowConfig(1, { default: { topics: { output: 42 } } });
+          yield* waitFor(() => backend.configConsumer.acknowledged.length === 1, "schema config ack");
+
+          yield* Fiber.interrupt(fiber);
+        }),
+      );
+
+      expect(backend.producers).toHaveLength(0);
+      expect(events).toEqual(["handler:1"]);
+      expect(backend.configConsumer.closeCount).toBeGreaterThanOrEqual(1);
+      expect(backend.closeCount).toBe(1);
+    }),
+  );
 });

ts/packages/base/src/processor/flow-processor.ts

@@ -38,7 +38,7 @@ import {
 import { makePubSubService, PubSub } from "../backend/pubsub.js";
 import { loadMessagingRuntimeConfig } from "../runtime/messaging-config.js";
 import { Duration, Effect, Exit, Layer, ManagedRuntime, Scope } from "effect";
-import * as Predicate from "effect/Predicate";
+import * as O from "effect/Option";
 import * as S from "effect/Schema";
 
 interface ConfigPush {
@@ -105,19 +105,14 @@ const ConfigPushSchema = S.Struct({
   config: S.Record(S.String, S.Unknown),
 });
 
-const isStringRecord = (value: unknown): value is Record<string, unknown> =>
+const FlowDefinitionSchema = S.Struct({
-  Predicate.isObject(value) && !Array.isArray(value);
+  topics: S.optionalKey(S.Record(S.String, S.String)),
+  parameters: S.optionalKey(S.Record(S.String, S.Unknown)),
+});
 
-const isTopicsRecord = (value: unknown): value is Record<string, string> =>
+const FlowDefinitionsSchema = S.Record(S.String, FlowDefinitionSchema);
-  isStringRecord(value) && Object.values(value).every((item) => typeof item === "string");
 
-const isFlowDefinition = (value: unknown): value is FlowDefinition => {
+const decodeFlowDefinitions = S.decodeUnknownOption(FlowDefinitionsSchema);
-  if (!isStringRecord(value)) return false;
-  const topics = value.topics;
-  const parameters = value.parameters;
-  return (topics === undefined || isTopicsRecord(topics)) &&
-    (parameters === undefined || isStringRecord(parameters));
-};
 
 export function runFlowProcessorDefinitionScoped<
   FlowRequirements = never,
@@ -220,12 +215,14 @@ export function runFlowProcessorDefinitionScoped<
         yield* Effect.log(`[${options.id}] No flows in config push, skipping`);
         return;
       }
-      if (!isStringRecord(flowDefs)) {
+      const decodedFlowDefs = decodeFlowDefinitions(flowDefs);
+      if (O.isNone(decodedFlowDefs)) {
         yield* Effect.logWarning(`[${options.id}] Skipping config push: flows is not an object`);
         return;
       }
+      const flowDefinitions = decodedFlowDefs.value;
 
-      const flowsJson = yield* S.encodeUnknownEffect(S.UnknownFromJsonString)(flowDefs).pipe(
+      const flowsJson = yield* S.encodeUnknownEffect(S.UnknownFromJsonString)(flowDefinitions).pipe(
         Effect.catch((error) => Effect.succeed(String(error))),
       );
       if (lastFlowsJson.length > 0 && flowsJson === lastFlowsJson && flows.size > 0) {
@@ -235,19 +232,14 @@ export function runFlowProcessorDefinitionScoped<
       lastFlowsJson = flowsJson;
 
       for (const [name, activeFlow] of flows) {
-        if (!(name in flowDefs)) {
+        if (!(name in flowDefinitions)) {
           yield* Effect.log(`[${options.id}] Stopping removed flow: ${name}`);
           yield* closeFlowEffect(name, activeFlow);
           flows.delete(name);
         }
       }
 
-      for (const [name, defn] of Object.entries(flowDefs)) {
+      for (const [name, defn] of Object.entries(flowDefinitions)) {
-        if (!isFlowDefinition(defn)) {
-          yield* Effect.logWarning(`[${options.id}] Skipping flow "${name}": definition is not an object`);
-          continue;
-        }
-
         const existing = flows.get(name);
         if (existing !== undefined) {
           yield* Effect.log(`[${options.id}] Restarting flow "${name}" with updated config`);