diff --git a/ts/EFFECT_NATIVE_REWRITE_AUDIT.md b/ts/EFFECT_NATIVE_REWRITE_AUDIT.md
index 979af51f..1b6c63e5 100644
--- a/ts/EFFECT_NATIVE_REWRITE_AUDIT.md
+++ b/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 request-response
-queue stream slice:
+Current signal counts from `ts/packages` after the 2026-06-02 client RPC
+acquisition cause tap slice:
 
 | Signal | Count |
 | --- | ---: |
@@ -138,6 +138,10 @@ Notes:
   around the socket program by sandboxing the Effect and handling the resulting
   `Cause` in the Effect pipeline before the Fastify fire-and-forget
   `runPromise` boundary.
+- The client RPC acquisition cause tap slice removed the Promise `.catch` used
+  only to update connection state on runtime/client acquisition failure.
+  `effect-rpc-client.ts` now uses `Effect.tapCause` and `Cause.pretty` before
+  the public Promise boundary.
 - `Record<string, any>` and `throwLibrarianServiceError` are now clean in
   `ts/packages`.
 
@@ -985,6 +989,27 @@ Notes:
   - `cd ts && bun run test`
   - `git diff --check`
 
+### 2026-06-02: Client RPC Acquisition Cause Tap Slice
+
+- Status: migrated and root-verified.
+- Completed:
+  - `ts/packages/client/src/socket/effect-rpc-client.ts` now observes
+    runtime/client acquisition failures with `Effect.tapCause` and
+    `Cause.pretty`.
+  - Removed the Promise `.catch(...)` that only updated local connection state
+    after `runtime.runPromise(TrustGraphRpcClientService)`.
+  - Removed the local `errorMessage` helper and its message-field assertion.
+  - Public `dispatch`, `dispatchStream`, and `close` Promise facades remain
+    compatibility boundaries.
+- Verification:
+  - `cd ts && bun run check:tsgo`
+  - `bun run --cwd ts/packages/client build`
+  - `bun run --cwd ts/packages/client test`
+  - `cd ts && bun run check`
+  - `cd ts && bun run build`
+  - `cd ts && bun run test`
+  - `git diff --check`
+
 ## Subagent Findings To Preserve
 
 - MCP/workbench:
diff --git a/ts/packages/client/src/socket/effect-rpc-client.ts b/ts/packages/client/src/socket/effect-rpc-client.ts
index 66b3ab38..b7ec7bd9 100644
--- a/ts/packages/client/src/socket/effect-rpc-client.ts
+++ b/ts/packages/client/src/socket/effect-rpc-client.ts
@@ -1,4 +1,4 @@
-import { Context, Effect, Layer, ManagedRuntime, Stream } from "effect";
+import { Cause, Context, Effect, Layer, ManagedRuntime, Stream } from "effect";
 import type * as RpcGroup from "effect/unstable/rpc/RpcGroup";
 import * as RpcClient from "effect/unstable/rpc/RpcClient";
 import type { RpcClientError } from "effect/unstable/rpc/RpcClientError";
@@ -128,13 +128,18 @@ export function makeEffectRpcClient(
   };
 
   const runtime = ManagedRuntime.make(makeClientLayer());
-  const clientPromise = runtime.runPromise(TrustGraphRpcClientService);
-  clientPromise.catch((cause) => {
-    setState({
-      status: "failed",
-      lastError: errorMessage(cause),
-    });
-  });
+  const clientPromise = runtime.runPromise(
+    TrustGraphRpcClientService.pipe(
+      Effect.tapCause((cause) =>
+        Effect.sync(() => {
+          setState({
+            status: "failed",
+            lastError: Cause.pretty(cause),
+          });
+        })
+      ),
+    ),
+  );
 
   return {
     subscribe: (listener) => {
@@ -200,16 +205,6 @@ export function withDispatchRequestPolicy<A, E, R>(
   return retryTimes > 0 ? timed.pipe(Effect.retry({ times: retryTimes })) : timed;
 }
 
-function errorMessage(cause: unknown): string {
-  if (cause instanceof Error) return cause.message;
-  if (typeof cause === "string") return cause;
-  if (cause !== null && typeof cause === "object" && "message" in cause) {
-    const message = (cause as { message?: unknown }).message;
-    if (typeof message === "string") return message;
-  }
-  return String(cause);
-}
-
 function normalizeTimeoutMs(timeoutMs: number | undefined): number {
   if (timeoutMs === undefined || !Number.isFinite(timeoutMs) || timeoutMs <= 0) {
     return DEFAULT_REQUEST_TIMEOUT_MS;