diff --git a/apps/server/src/modules/AgentRuntime/formatErrorForState.test.ts b/apps/server/src/modules/AgentRuntime/formatErrorForState.test.ts
index e6fa8373d2..0c8b435942 100644
--- a/apps/server/src/modules/AgentRuntime/formatErrorForState.test.ts
+++ b/apps/server/src/modules/AgentRuntime/formatErrorForState.test.ts
@@ -132,6 +132,14 @@ describe('formatErrorForState', () => {
       expect(result.countAsFailure).toBeUndefined();
       expect(result.numericId).toBeUndefined();
     });
+
+    it('classifies a raw Drizzle "Failed query" Error via its message instead of a bare 500', () => {
+      const result = formatErrorForState(new Error('Failed query: rollback\nparams: '));
+
+      expect(result.type).toBe(AgentRuntimeErrorType.DatabasePersistError);
+      expect(result.numericId).toBe(7004);
+      expect(result.attribution).toBe('harness');
+    });
   });
 
   describe('ProviderBizError refinement', () => {
diff --git a/packages/locales/src/default/modelRuntime.ts b/packages/locales/src/default/modelRuntime.ts
index f4df70cc7a..40a8fffd08 100644
--- a/packages/locales/src/default/modelRuntime.ts
+++ b/packages/locales/src/default/modelRuntime.ts
@@ -69,6 +69,8 @@ export default {
     "Sorry, the token usage or request count has reached the rate limit for this key. Please try again later or increase the key's quota.",
   StateStorePersistError:
     'A temporary issue with the conversation state store interrupted this operation. Please try again; if it persists, contact support.',
+  StateStoreReadError:
+    'This operation was ended because the connection closed before it finished. This is usually harmless — reopen the conversation to continue.',
   StreamChunkError:
     'Error parsing the message chunk of the streaming request. Please check if the current API interface complies with the standard specifications, or contact your API provider for assistance.',
   UpstreamGatewayError:
diff --git a/packages/model-runtime/src/errors/match.test.ts b/packages/model-runtime/src/errors/match.test.ts
index 9ac9a8b50e..91f37e1cba 100644
--- a/packages/model-runtime/src/errors/match.test.ts
+++ b/packages/model-runtime/src/errors/match.test.ts
@@ -94,6 +94,20 @@ describe('matchErrorPattern', () => {
     ).toBe(AgentRuntimeErrorType.StateStorePersistError);
   });
 
+  it('classifies the Upstash readonly-upgrade write rejection as StateStorePersistError', () => {
+    expect(
+      matchErrorPattern({
+        message: 'READONLY Writes are temporarily rejected due to server upgrade',
+      })?.code,
+    ).toBe(AgentRuntimeErrorType.StateStorePersistError);
+  });
+
+  it('classifies a caller-gone blocking-read abort as StateStoreReadError (benign, not a persist failure)', () => {
+    expect(matchErrorPattern({ message: 'ERR caller gone' })?.code).toBe(
+      AgentRuntimeErrorType.StateStoreReadError,
+    );
+  });
+
   it('classifies harness JS runtime crashes as AgentRuntimeError', () => {
     for (const message of [
       'e.trim is not a function',
diff --git a/packages/model-runtime/src/errors/patterns.ts b/packages/model-runtime/src/errors/patterns.ts
index 0b92199bd1..b45c9d9655 100644
--- a/packages/model-runtime/src/errors/patterns.ts
+++ b/packages/model-runtime/src/errors/patterns.ts
@@ -514,9 +514,21 @@ export const ERROR_PATTERNS: ErrorPattern[] = [
     match: sub('Connection error.'),
   },
 
+  // ─────────────────────────────────────────────────────────────────────────
+  // StateStoreReadError — a blocking state-store READ (XREAD / BLPOP) aborted
+  // because the caller disconnected. Benign client abandonment; must precede
+  // StateStorePersistError so the write-side bucket doesn't claim it.
+  // ─────────────────────────────────────────────────────────────────────────
+  {
+    code: AgentRuntimeErrorType.StateStoreReadError,
+    match: sub('ERR caller gone'),
+    note: 'Upstash aborts the in-flight blocking read (XREAD/BLPOP) when the originating request is already gone.',
+  },
+
   // ─────────────────────────────────────────────────────────────────────────
   // StateStorePersistError — Redis / Upstash agent-state store (NOT the LLM
-  // provider). ioredis aborts, request-size cap, suspended DB.
+  // provider). ioredis aborts, request-size cap, suspended DB, readonly upgrade
+  // window. Write / connection-level drops.
   // ─────────────────────────────────────────────────────────────────────────
   {
     code: AgentRuntimeErrorType.StateStorePersistError,
@@ -531,6 +543,11 @@ export const ERROR_PATTERNS: ErrorPattern[] = [
     code: AgentRuntimeErrorType.StateStorePersistError,
     match: sub('database has been suspended'),
   },
+  {
+    code: AgentRuntimeErrorType.StateStorePersistError,
+    match: sub('READONLY Writes are temporarily rejected'),
+    note: 'Upstash rejects writes against the read-only replica during a server upgrade.',
+  },
 
   // ─────────────────────────────────────────────────────────────────────────
   // NoAvailableChannel — router / proxy has no upstream
diff --git a/packages/model-runtime/src/errors/refine.test.ts b/packages/model-runtime/src/errors/refine.test.ts
index ec02b6e03c..ec63e2b6ea 100644
--- a/packages/model-runtime/src/errors/refine.test.ts
+++ b/packages/model-runtime/src/errors/refine.test.ts
@@ -1,4 +1,4 @@
-import { AgentRuntimeErrorType } from '@lobechat/types';
+import { AgentRuntimeErrorType, ChatErrorType } from '@lobechat/types';
 import { describe, expect, it } from 'vitest';
 
 import { refineErrorCode } from './refine';
@@ -13,6 +13,57 @@ describe('refineErrorCode', () => {
     ).toBeUndefined();
   });
 
+  describe('un-typed throw wrappers', () => {
+    // A raw `Error` (e.g. a Drizzle "Failed query: …" throw) is wrapped by
+    // formatErrorForState as InternalServerError (HTTP 500). It must still reach
+    // the message patterns, otherwise it persists as a bare, un-classified 500.
+    it('reclassifies a 500-wrapped Drizzle throw into DatabasePersistError', () => {
+      expect(
+        refineErrorCode({
+          errorType: String(ChatErrorType.InternalServerError),
+          message: 'Failed query: rollback\nparams: ',
+        }),
+      ).toBe(AgentRuntimeErrorType.DatabasePersistError);
+    });
+
+    it('reclassifies an AgentRuntimeError-wrapped throw via its message', () => {
+      expect(
+        refineErrorCode({
+          errorType: AgentRuntimeErrorType.AgentRuntimeError,
+          message: 'Failed query: select "id" from "messages"',
+        }),
+      ).toBe(AgentRuntimeErrorType.DatabasePersistError);
+    });
+
+    it('leaves a 500 wrapper unrefined when nothing matches', () => {
+      expect(
+        refineErrorCode({
+          errorType: String(ChatErrorType.InternalServerError),
+          message: 'Agent state not found for operation op_xxx',
+        }),
+      ).toBeUndefined();
+    });
+
+    // The HTTP-status fallback is provider-only: a leading "429"/"500" in a
+    // harness/DB/Redis throw is not a real upstream status and must NOT recast
+    // the error with provider retry/failure semantics.
+    it('does not apply the HTTP-status fallback to un-typed wrappers', () => {
+      expect(
+        refineErrorCode({
+          errorType: String(ChatErrorType.InternalServerError),
+          message: '429 some harness throw with no registered pattern',
+        }),
+      ).toBeUndefined();
+      expect(
+        refineErrorCode({
+          errorType: AgentRuntimeErrorType.AgentRuntimeError,
+          httpStatus: 500,
+          message: 'opaque internal failure',
+        }),
+      ).toBeUndefined();
+    });
+  });
+
   describe('message-pattern pass', () => {
     it('reclassifies a rate-limit message into RateLimitExceeded', () => {
       expect(
diff --git a/packages/model-runtime/src/errors/refine.ts b/packages/model-runtime/src/errors/refine.ts
index cd4a60f71f..847c7873ac 100644
--- a/packages/model-runtime/src/errors/refine.ts
+++ b/packages/model-runtime/src/errors/refine.ts
@@ -1,14 +1,35 @@
-import { AgentRuntimeErrorType, type ILobeAgentRuntimeErrorType } from '@lobechat/types';
+import {
+  AgentRuntimeErrorType,
+  ChatErrorType,
+  type ILobeAgentRuntimeErrorType,
+} from '@lobechat/types';
 
 import { matchErrorPattern } from './match';
 
 /**
- * Error codes that are generic enough to be worth re-deriving from the upstream
- * message / HTTP status. Specific codes assigned by a provider adapter are left
- * untouched — we only refine the `ProviderBizError` catch-all, which absorbs
- * any non-OK upstream response that the adapter couldn't name.
+ * Codes whose message is worth running through `matchErrorPattern`.
+ *
+ * Besides the `ProviderBizError` upstream catch-all, this covers the two
+ * fallback wrappers `formatErrorForState` produces for un-typed throws: a raw
+ * `Error` is wrapped as `InternalServerError` (HTTP 500) and any other value as
+ * `AgentRuntimeError`. They must be pattern-refinable so persistence-layer
+ * throws (`Failed query: …`) and state-store drops reach the registry — without
+ * them those land as a bare, un-classified 500.
  */
-const REFINABLE_CODES = new Set<string>([AgentRuntimeErrorType.ProviderBizError]);
+const PATTERN_REFINABLE_CODES = new Set<string>([
+  AgentRuntimeErrorType.AgentRuntimeError,
+  AgentRuntimeErrorType.ProviderBizError,
+  String(ChatErrorType.InternalServerError),
+]);
+
+/**
+ * Codes eligible for the coarse HTTP-status fallback — provider catch-alls
+ * only. A leading "429"/"500" in an upstream body is a real status signal, but
+ * the same digits in a harness/DB/Redis throw (e.g. `Error('500 …')`) are not:
+ * those must keep their original `InternalServerError` / `AgentRuntimeError`
+ * code rather than being recast with provider retry/failure semantics.
+ */
+const STATUS_REFINABLE_CODES = new Set<string>([AgentRuntimeErrorType.ProviderBizError]);
 
 /**
  * Last-resort mapping from a bare HTTP status to a code, used only when the
@@ -50,27 +71,31 @@ export interface RefineErrorInput {
 }
 
 /**
- * Reclassify a generic provider catch-all (`ProviderBizError`) into a more
- * specific code using the upstream message and HTTP status. Returns the refined
- * code, or `undefined` when no better classification is found (caller keeps the
- * original errorType).
+ * Reclassify a generic catch-all (`ProviderBizError`, or the
+ * `InternalServerError` / `AgentRuntimeError` fallback wrappers) into a more
+ * specific code using the message and HTTP status. Returns the refined code, or
+ * `undefined` when no better classification is found (caller keeps the original
+ * errorType).
  *
  * Priority:
  *   1. `matchErrorPattern` over the message — most specific, covers the rich
- *      cases plus the migrated `Upstream*` patterns.
- *   2. HTTP-status fallback for messages that matched nothing.
+ *      cases plus the migrated `Upstream*` patterns. Open to all wrappers.
+ *   2. HTTP-status fallback for messages that matched nothing — provider
+ *      catch-alls only (see `STATUS_REFINABLE_CODES`).
  */
 export const refineErrorCode = (
   input: RefineErrorInput,
 ): ILobeAgentRuntimeErrorType | undefined => {
   const { errorType, httpStatus, message, provider } = input;
-  if (!errorType || !REFINABLE_CODES.has(errorType)) return undefined;
+  if (!errorType || !PATTERN_REFINABLE_CODES.has(errorType)) return undefined;
 
   const matched = matchErrorPattern({ errorType, message, provider });
   if (matched && matched.code !== errorType) return matched.code;
 
-  const byStatus = codeFromHttpStatus(httpStatus ?? leadingStatusFromMessage(message));
-  if (byStatus && byStatus !== errorType) return byStatus;
+  if (STATUS_REFINABLE_CODES.has(errorType)) {
+    const byStatus = codeFromHttpStatus(httpStatus ?? leadingStatusFromMessage(message));
+    if (byStatus && byStatus !== errorType) return byStatus;
+  }
 
   return undefined;
 };
diff --git a/packages/model-runtime/src/errors/specs.ts b/packages/model-runtime/src/errors/specs.ts
index faeb83190c..4d5ca8c619 100644
--- a/packages/model-runtime/src/errors/specs.ts
+++ b/packages/model-runtime/src/errors/specs.ts
@@ -418,6 +418,18 @@ export const ERROR_CODE_SPECS: SpecMap = {
     description:
       'Context-engine pipeline processor crashed ("Processor [<name>] execution failed").',
   },
+  [AgentRuntimeErrorType.StateStoreReadError]: {
+    code: AgentRuntimeErrorType.StateStoreReadError,
+    numericId: 7007,
+    category: 'stream',
+    severity: 'warning',
+    attribution: 'system',
+    httpStatus: 500,
+    retryable: false,
+    countAsFailure: false,
+    description:
+      'State-store (Redis / Upstash) blocking read (XREAD / BLPOP) aborted because the caller disconnected ("ERR caller gone") — benign client abandonment.',
+  },
 
   // ─── 8xxx Provider (catch-all) ────────────────────────────────────────
   [AgentRuntimeErrorType.AgentRuntimeError]: {
diff --git a/packages/types/src/agentRuntime.ts b/packages/types/src/agentRuntime.ts
index 450d284ec0..10b1198563 100644
--- a/packages/types/src/agentRuntime.ts
+++ b/packages/types/src/agentRuntime.ts
@@ -137,6 +137,15 @@ export const AgentRuntimeErrorType = {
    * DB, …). Harness-side infra — the agent state layer, not the LLM provider.
    */
   StateStorePersistError: 'StateStorePersistError',
+  /**
+   * A blocking state-store read (XREAD / BLPOP, e.g. consuming the agent event
+   * stream or waiting on a tool result) was aborted because the originating
+   * caller disconnected — Upstash replies "ERR caller gone". Benign client
+   * abandonment tied to the request lifecycle, not a harness fault; kept
+   * distinct from the write-side StateStorePersistError so it is not counted
+   * as a failure.
+   */
+  StateStoreReadError: 'StateStoreReadError',
   /**
    * A context-engine pipeline processor threw while building the prompt
    * context ("Processor [<name>] execution failed"). Harness-side bug in the