diff --git a/src/agents/pi-embedded-runner.test.ts b/src/agents/pi-embedded-runner.test.ts
index 6c85bff4b..c1a7ffae7 100644
--- a/src/agents/pi-embedded-runner.test.ts
+++ b/src/agents/pi-embedded-runner.test.ts
@@ -11,6 +11,8 @@ import {
   applyGoogleTurnOrderingFix,
   buildEmbeddedSandboxInfo,
   createSystemPromptOverride,
+  getDmHistoryLimitFromSessionKey,
+  limitHistoryTurns,
   runEmbeddedPiAgent,
   splitSdkTools,
 } from "./pi-embedded-runner.js";
@@ -279,6 +281,280 @@ describe("applyGoogleTurnOrderingFix", () => {
   });
 });
 
+describe("limitHistoryTurns", () => {
+  const makeMessages = (roles: ("user" | "assistant")[]): AgentMessage[] =>
+    roles.map((role, i) => ({
+      role,
+      content: [{ type: "text", text: `message ${i}` }],
+    }));
+
+  it("returns all messages when limit is undefined", () => {
+    const messages = makeMessages(["user", "assistant", "user", "assistant"]);
+    expect(limitHistoryTurns(messages, undefined)).toBe(messages);
+  });
+
+  it("returns all messages when limit is 0", () => {
+    const messages = makeMessages(["user", "assistant", "user", "assistant"]);
+    expect(limitHistoryTurns(messages, 0)).toBe(messages);
+  });
+
+  it("returns all messages when limit is negative", () => {
+    const messages = makeMessages(["user", "assistant", "user", "assistant"]);
+    expect(limitHistoryTurns(messages, -1)).toBe(messages);
+  });
+
+  it("returns empty array when messages is empty", () => {
+    expect(limitHistoryTurns([], 5)).toEqual([]);
+  });
+
+  it("keeps all messages when fewer user turns than limit", () => {
+    const messages = makeMessages(["user", "assistant", "user", "assistant"]);
+    expect(limitHistoryTurns(messages, 10)).toBe(messages);
+  });
+
+  it("limits to last N user turns", () => {
+    const messages = makeMessages([
+      "user",
+      "assistant",
+      "user",
+      "assistant",
+      "user",
+      "assistant",
+    ]);
+    const limited = limitHistoryTurns(messages, 2);
+    expect(limited.length).toBe(4);
+    expect(limited[0].content).toEqual([{ type: "text", text: "message 2" }]);
+  });
+
+  it("handles single user turn limit", () => {
+    const messages = makeMessages([
+      "user",
+      "assistant",
+      "user",
+      "assistant",
+      "user",
+      "assistant",
+    ]);
+    const limited = limitHistoryTurns(messages, 1);
+    expect(limited.length).toBe(2);
+    expect(limited[0].content).toEqual([{ type: "text", text: "message 4" }]);
+    expect(limited[1].content).toEqual([{ type: "text", text: "message 5" }]);
+  });
+
+  it("handles messages with multiple assistant responses per user turn", () => {
+    const messages = makeMessages([
+      "user",
+      "assistant",
+      "assistant",
+      "user",
+      "assistant",
+    ]);
+    const limited = limitHistoryTurns(messages, 1);
+    expect(limited.length).toBe(2);
+    expect(limited[0].role).toBe("user");
+    expect(limited[1].role).toBe("assistant");
+  });
+
+  it("preserves message content integrity", () => {
+    const messages: AgentMessage[] = [
+      { role: "user", content: [{ type: "text", text: "first" }] },
+      {
+        role: "assistant",
+        content: [{ type: "toolCall", id: "1", name: "bash", arguments: {} }],
+      },
+      { role: "user", content: [{ type: "text", text: "second" }] },
+      { role: "assistant", content: [{ type: "text", text: "response" }] },
+    ];
+    const limited = limitHistoryTurns(messages, 1);
+    expect(limited[0].content).toEqual([{ type: "text", text: "second" }]);
+    expect(limited[1].content).toEqual([{ type: "text", text: "response" }]);
+  });
+});
+
+describe("getDmHistoryLimitFromSessionKey", () => {
+  it("returns undefined when sessionKey is undefined", () => {
+    expect(getDmHistoryLimitFromSessionKey(undefined, {})).toBeUndefined();
+  });
+
+  it("returns undefined when config is undefined", () => {
+    expect(
+      getDmHistoryLimitFromSessionKey("telegram:dm:123", undefined),
+    ).toBeUndefined();
+  });
+
+  it("returns dmHistoryLimit for telegram provider", () => {
+    const config = { telegram: { dmHistoryLimit: 15 } } as ClawdbotConfig;
+    expect(getDmHistoryLimitFromSessionKey("telegram:dm:123", config)).toBe(15);
+  });
+
+  it("returns dmHistoryLimit for whatsapp provider", () => {
+    const config = { whatsapp: { dmHistoryLimit: 20 } } as ClawdbotConfig;
+    expect(getDmHistoryLimitFromSessionKey("whatsapp:dm:123", config)).toBe(20);
+  });
+
+  it("returns dmHistoryLimit for agent-prefixed session keys", () => {
+    const config = { telegram: { dmHistoryLimit: 10 } } as ClawdbotConfig;
+    expect(
+      getDmHistoryLimitFromSessionKey("agent:main:telegram:dm:123", config),
+    ).toBe(10);
+  });
+
+  it("returns undefined for non-dm session kinds", () => {
+    const config = {
+      slack: { dmHistoryLimit: 10 },
+      telegram: { dmHistoryLimit: 15 },
+    } as ClawdbotConfig;
+    expect(
+      getDmHistoryLimitFromSessionKey("agent:beta:slack:channel:C1", config),
+    ).toBeUndefined();
+    expect(
+      getDmHistoryLimitFromSessionKey("telegram:slash:123", config),
+    ).toBeUndefined();
+  });
+
+  it("returns undefined for unknown provider", () => {
+    const config = { telegram: { dmHistoryLimit: 15 } } as ClawdbotConfig;
+    expect(
+      getDmHistoryLimitFromSessionKey("unknown:dm:123", config),
+    ).toBeUndefined();
+  });
+
+  it("returns undefined when provider config has no dmHistoryLimit", () => {
+    const config = { telegram: {} } as ClawdbotConfig;
+    expect(
+      getDmHistoryLimitFromSessionKey("telegram:dm:123", config),
+    ).toBeUndefined();
+  });
+
+  it("handles all supported providers", () => {
+    const providers = [
+      "telegram",
+      "whatsapp",
+      "discord",
+      "slack",
+      "signal",
+      "imessage",
+      "msteams",
+    ] as const;
+
+    for (const provider of providers) {
+      const config = { [provider]: { dmHistoryLimit: 5 } } as ClawdbotConfig;
+      expect(
+        getDmHistoryLimitFromSessionKey(`${provider}:dm:123`, config),
+      ).toBe(5);
+    }
+  });
+
+  it("handles per-DM overrides for all supported providers", () => {
+    const providers = [
+      "telegram",
+      "whatsapp",
+      "discord",
+      "slack",
+      "signal",
+      "imessage",
+      "msteams",
+    ] as const;
+
+    for (const provider of providers) {
+      // Test per-DM override takes precedence
+      const configWithOverride = {
+        [provider]: {
+          dmHistoryLimit: 20,
+          dms: { user123: { historyLimit: 7 } },
+        },
+      } as ClawdbotConfig;
+      expect(
+        getDmHistoryLimitFromSessionKey(
+          `${provider}:dm:user123`,
+          configWithOverride,
+        ),
+      ).toBe(7);
+
+      // Test fallback to provider default when user not in dms
+      expect(
+        getDmHistoryLimitFromSessionKey(
+          `${provider}:dm:otheruser`,
+          configWithOverride,
+        ),
+      ).toBe(20);
+
+      // Test with agent-prefixed key
+      expect(
+        getDmHistoryLimitFromSessionKey(
+          `agent:main:${provider}:dm:user123`,
+          configWithOverride,
+        ),
+      ).toBe(7);
+    }
+  });
+
+  it("returns per-DM override when set", () => {
+    const config = {
+      telegram: {
+        dmHistoryLimit: 15,
+        dms: { "123": { historyLimit: 5 } },
+      },
+    } as ClawdbotConfig;
+    expect(getDmHistoryLimitFromSessionKey("telegram:dm:123", config)).toBe(5);
+  });
+
+  it("falls back to provider default when per-DM not set", () => {
+    const config = {
+      telegram: {
+        dmHistoryLimit: 15,
+        dms: { "456": { historyLimit: 5 } },
+      },
+    } as ClawdbotConfig;
+    expect(getDmHistoryLimitFromSessionKey("telegram:dm:123", config)).toBe(15);
+  });
+
+  it("returns per-DM override for agent-prefixed keys", () => {
+    const config = {
+      telegram: {
+        dmHistoryLimit: 20,
+        dms: { "789": { historyLimit: 3 } },
+      },
+    } as ClawdbotConfig;
+    expect(
+      getDmHistoryLimitFromSessionKey("agent:main:telegram:dm:789", config),
+    ).toBe(3);
+  });
+
+  it("handles userId with colons (e.g., email)", () => {
+    const config = {
+      msteams: {
+        dmHistoryLimit: 10,
+        dms: { "user@example.com": { historyLimit: 7 } },
+      },
+    } as ClawdbotConfig;
+    expect(
+      getDmHistoryLimitFromSessionKey("msteams:dm:user@example.com", config),
+    ).toBe(7);
+  });
+
+  it("returns undefined when per-DM historyLimit is not set", () => {
+    const config = {
+      telegram: {
+        dms: { "123": {} },
+      },
+    } as ClawdbotConfig;
+    expect(
+      getDmHistoryLimitFromSessionKey("telegram:dm:123", config),
+    ).toBeUndefined();
+  });
+
+  it("returns 0 when per-DM historyLimit is explicitly 0 (unlimited)", () => {
+    const config = {
+      telegram: {
+        dmHistoryLimit: 15,
+        dms: { "123": { historyLimit: 0 } },
+      },
+    } as ClawdbotConfig;
+    expect(getDmHistoryLimitFromSessionKey("telegram:dm:123", config)).toBe(0);
+  });
+});
+
 describe("runEmbeddedPiAgent", () => {
   it("writes models.json into the provided agentDir", async () => {
     const agentDir = await fs.mkdtemp(
diff --git a/src/agents/pi-embedded-runner.ts b/src/agents/pi-embedded-runner.ts
index 48516bf54..3932f49fd 100644
--- a/src/agents/pi-embedded-runner.ts
+++ b/src/agents/pi-embedded-runner.ts
@@ -413,6 +413,113 @@ async function sanitizeSessionHistory(params: {
   }).messages;
 }
 
+/**
+ * Limits conversation history to the last N user turns (and their associated
+ * assistant responses). This reduces token usage for long-running DM sessions.
+ *
+ * @param messages - The full message history
+ * @param limit - Max number of user turns to keep (undefined = no limit)
+ * @returns Messages trimmed to the last `limit` user turns
+ */
+export function limitHistoryTurns(
+  messages: AgentMessage[],
+  limit: number | undefined,
+): AgentMessage[] {
+  if (!limit || limit <= 0 || messages.length === 0) return messages;
+
+  // Count user messages from the end, find cutoff point
+  let userCount = 0;
+  let lastUserIndex = messages.length;
+
+  for (let i = messages.length - 1; i >= 0; i--) {
+    if (messages[i].role === "user") {
+      userCount++;
+      if (userCount > limit) {
+        // We exceeded the limit; keep from the last valid user turn onwards
+        return messages.slice(lastUserIndex);
+      }
+      lastUserIndex = i;
+    }
+  }
+  // Fewer than limit user turns, keep all
+  return messages;
+}
+
+/**
+ * Extracts the provider name and user ID from a session key and looks up
+ * dmHistoryLimit from the provider config, with per-DM override support.
+ *
+ * Session key formats:
+ * - `telegram:dm:123` → provider = telegram, userId = 123
+ * - `agent:main:telegram:dm:123` → provider = telegram, userId = 123
+ *
+ * Resolution order:
+ * 1. Per-DM override: provider.dms[userId].historyLimit
+ * 2. Provider default: provider.dmHistoryLimit
+ */
+export function getDmHistoryLimitFromSessionKey(
+  sessionKey: string | undefined,
+  config: ClawdbotConfig | undefined,
+): number | undefined {
+  if (!sessionKey || !config) return undefined;
+
+  const parts = sessionKey.split(":").filter(Boolean);
+  // Handle agent-prefixed keys: agent:<agentId>:<provider>:...
+  const providerParts =
+    parts.length >= 3 && parts[0] === "agent" ? parts.slice(2) : parts;
+
+  const provider = providerParts[0]?.toLowerCase();
+  if (!provider) return undefined;
+
+  // Extract userId: format is provider:dm:userId or provider:dm:userId:...
+  // The userId may contain colons (e.g., email addresses), so join remaining parts
+  const kind = providerParts[1]?.toLowerCase();
+  const userId = providerParts.slice(2).join(":");
+  if (kind !== "dm") return undefined;
+
+  // Helper to get limit with per-DM override support
+  const getLimit = (
+    providerConfig:
+      | {
+          dmHistoryLimit?: number;
+          dms?: Record<string, { historyLimit?: number }>;
+        }
+      | undefined,
+  ): number | undefined => {
+    if (!providerConfig) return undefined;
+    // Check per-DM override first
+    if (
+      userId &&
+      kind === "dm" &&
+      providerConfig.dms?.[userId]?.historyLimit !== undefined
+    ) {
+      return providerConfig.dms[userId].historyLimit;
+    }
+    // Fall back to provider default
+    return providerConfig.dmHistoryLimit;
+  };
+
+  // Map provider to config key
+  switch (provider) {
+    case "telegram":
+      return getLimit(config.telegram);
+    case "whatsapp":
+      return getLimit(config.whatsapp);
+    case "discord":
+      return getLimit(config.discord);
+    case "slack":
+      return getLimit(config.slack);
+    case "signal":
+      return getLimit(config.signal);
+    case "imessage":
+      return getLimit(config.imessage);
+    case "msteams":
+      return getLimit(config.msteams);
+    default:
+      return undefined;
+  }
+}
+
 const ACTIVE_EMBEDDED_RUNS = new Map<string, EmbeddedPiQueueHandle>();
 type EmbeddedRunWaiter = {
   resolve: (ended: boolean) => void;
@@ -1026,8 +1133,12 @@ export async function compactEmbeddedPiSession(params: {
               sessionId: params.sessionId,
             });
             const validated = validateGeminiTurns(prior);
-            if (validated.length > 0) {
-              session.agent.replaceMessages(validated);
+            const limited = limitHistoryTurns(
+              validated,
+              getDmHistoryLimitFromSessionKey(params.sessionKey, params.config),
+            );
+            if (limited.length > 0) {
+              session.agent.replaceMessages(limited);
             }
             const result = await session.compact(params.customInstructions);
             return {
@@ -1417,8 +1528,12 @@ export async function runEmbeddedPiAgent(params: {
               sessionId: params.sessionId,
             });
             const validated = validateGeminiTurns(prior);
-            if (validated.length > 0) {
-              session.agent.replaceMessages(validated);
+            const limited = limitHistoryTurns(
+              validated,
+              getDmHistoryLimitFromSessionKey(params.sessionKey, params.config),
+            );
+            if (limited.length > 0) {
+              session.agent.replaceMessages(limited);
             }
           } catch (err) {
             session.dispose();
diff --git a/src/config/types.ts b/src/config/types.ts
index 8a827a0ee..9bf8b6f06 100644
--- a/src/config/types.ts
+++ b/src/config/types.ts
@@ -147,6 +147,10 @@ export type WhatsAppConfig = {
   groupPolicy?: GroupPolicy;
   /** Max group messages to keep as history context (0 disables). */
   historyLimit?: number;
+  /** Max DM turns to keep as history context. */
+  dmHistoryLimit?: number;
+  /** Per-DM config overrides keyed by user ID. */
+  dms?: Record<string, DmConfig>;
   /** Outbound text chunk size (chars). Default: 4000. */
   textChunkLimit?: number;
   /** Maximum media file size in MB. Default: 50. */
@@ -200,6 +204,10 @@ export type WhatsAppAccountConfig = {
   groupPolicy?: GroupPolicy;
   /** Max group messages to keep as history context (0 disables). */
   historyLimit?: number;
+  /** Max DM turns to keep as history context. */
+  dmHistoryLimit?: number;
+  /** Per-DM config overrides keyed by user ID. */
+  dms?: Record<string, DmConfig>;
   textChunkLimit?: number;
   mediaMaxMb?: number;
   blockStreaming?: boolean;
@@ -379,6 +387,10 @@ export type TelegramAccountConfig = {
   groupPolicy?: GroupPolicy;
   /** Max group messages to keep as history context (0 disables). */
   historyLimit?: number;
+  /** Max DM turns to keep as history context. */
+  dmHistoryLimit?: number;
+  /** Per-DM config overrides keyed by user ID. */
+  dms?: Record<string, DmConfig>;
   /** Outbound text chunk size (chars). Default: 4000. */
   textChunkLimit?: number;
   /** Disable block streaming for this account. */
@@ -522,6 +534,10 @@ export type DiscordAccountConfig = {
   maxLinesPerMessage?: number;
   mediaMaxMb?: number;
   historyLimit?: number;
+  /** Max DM turns to keep as history context. */
+  dmHistoryLimit?: number;
+  /** Per-DM config overrides keyed by user ID. */
+  dms?: Record<string, DmConfig>;
   /** Retry policy for outbound Discord API calls. */
   retry?: OutboundRetryConfig;
   /** Per-action tool gating (default: true for all). */
@@ -618,6 +634,10 @@ export type SlackAccountConfig = {
   groupPolicy?: GroupPolicy;
   /** Max channel messages to keep as history context (0 disables). */
   historyLimit?: number;
+  /** Max DM turns to keep as history context. */
+  dmHistoryLimit?: number;
+  /** Per-DM config overrides keyed by user ID. */
+  dms?: Record<string, DmConfig>;
   textChunkLimit?: number;
   blockStreaming?: boolean;
   /** Merge streamed block replies before sending. */
@@ -677,6 +697,10 @@ export type SignalAccountConfig = {
   groupPolicy?: GroupPolicy;
   /** Max group messages to keep as history context (0 disables). */
   historyLimit?: number;
+  /** Max DM turns to keep as history context. */
+  dmHistoryLimit?: number;
+  /** Per-DM config overrides keyed by user ID. */
+  dms?: Record<string, DmConfig>;
   /** Outbound text chunk size (chars). Default: 4000. */
   textChunkLimit?: number;
   blockStreaming?: boolean;
@@ -752,6 +776,10 @@ export type MSTeamsConfig = {
   requireMention?: boolean;
   /** Max group/channel messages to keep as history context (0 disables). */
   historyLimit?: number;
+  /** Max DM turns to keep as history context. */
+  dmHistoryLimit?: number;
+  /** Per-DM config overrides keyed by user ID. */
+  dms?: Record<string, DmConfig>;
   /** Default reply style: "thread" replies to the message, "top-level" posts a new message. */
   replyStyle?: MSTeamsReplyStyle;
   /** Per-team config. Key is team ID (from the /team/ URL path segment). */
@@ -788,6 +816,10 @@ export type IMessageAccountConfig = {
   groupPolicy?: GroupPolicy;
   /** Max group messages to keep as history context (0 disables). */
   historyLimit?: number;
+  /** Max DM turns to keep as history context. */
+  dmHistoryLimit?: number;
+  /** Per-DM config overrides keyed by user ID. */
+  dms?: Record<string, DmConfig>;
   /** Include attachments + reactions in watch payloads. */
   includeAttachments?: boolean;
   /** Max outbound media size in MB. */
@@ -925,6 +957,10 @@ export type GroupChatConfig = {
   historyLimit?: number;
 };
 
+export type DmConfig = {
+  historyLimit?: number;
+};
+
 export type QueueConfig = {
   mode?: QueueMode;
   byProvider?: QueueModeByProvider;
diff --git a/src/config/zod-schema.ts b/src/config/zod-schema.ts
index f7fa0c7c9..c30dba4bd 100644
--- a/src/config/zod-schema.ts
+++ b/src/config/zod-schema.ts
@@ -62,6 +62,10 @@ const GroupChatSchema = z
   })
   .optional();
 
+const DmConfigSchema = z.object({
+  historyLimit: z.number().int().min(0).optional(),
+});
+
 const IdentitySchema = z
   .object({
     name: z.string().optional(),
@@ -273,6 +277,8 @@ const TelegramAccountSchemaBase = z.object({
   groupAllowFrom: z.array(z.union([z.string(), z.number()])).optional(),
   groupPolicy: GroupPolicySchema.optional().default("open"),
   historyLimit: z.number().int().min(0).optional(),
+  dmHistoryLimit: z.number().int().min(0).optional(),
+  dms: z.record(z.string(), DmConfigSchema.optional()).optional(),
   textChunkLimit: z.number().int().positive().optional(),
   blockStreaming: z.boolean().optional(),
   draftChunk: BlockStreamingChunkSchema.optional(),
@@ -362,6 +368,8 @@ const DiscordAccountSchema = z.object({
   token: z.string().optional(),
   groupPolicy: GroupPolicySchema.optional().default("open"),
   historyLimit: z.number().int().min(0).optional(),
+  dmHistoryLimit: z.number().int().min(0).optional(),
+  dms: z.record(z.string(), DmConfigSchema.optional()).optional(),
   textChunkLimit: z.number().int().positive().optional(),
   blockStreaming: z.boolean().optional(),
   blockStreamingCoalesce: BlockStreamingCoalesceSchema.optional(),
@@ -434,6 +442,8 @@ const SlackAccountSchema = z.object({
   allowBots: z.boolean().optional(),
   groupPolicy: GroupPolicySchema.optional().default("open"),
   historyLimit: z.number().int().min(0).optional(),
+  dmHistoryLimit: z.number().int().min(0).optional(),
+  dms: z.record(z.string(), DmConfigSchema.optional()).optional(),
   textChunkLimit: z.number().int().positive().optional(),
   blockStreaming: z.boolean().optional(),
   blockStreamingCoalesce: BlockStreamingCoalesceSchema.optional(),
@@ -488,6 +498,8 @@ const SignalAccountSchemaBase = z.object({
   groupAllowFrom: z.array(z.union([z.string(), z.number()])).optional(),
   groupPolicy: GroupPolicySchema.optional().default("open"),
   historyLimit: z.number().int().min(0).optional(),
+  dmHistoryLimit: z.number().int().min(0).optional(),
+  dms: z.record(z.string(), DmConfigSchema.optional()).optional(),
   textChunkLimit: z.number().int().positive().optional(),
   blockStreaming: z.boolean().optional(),
   blockStreamingCoalesce: BlockStreamingCoalesceSchema.optional(),
@@ -536,6 +548,8 @@ const IMessageAccountSchemaBase = z.object({
   groupAllowFrom: z.array(z.union([z.string(), z.number()])).optional(),
   groupPolicy: GroupPolicySchema.optional().default("open"),
   historyLimit: z.number().int().min(0).optional(),
+  dmHistoryLimit: z.number().int().min(0).optional(),
+  dms: z.record(z.string(), DmConfigSchema.optional()).optional(),
   includeAttachments: z.boolean().optional(),
   mediaMaxMb: z.number().int().positive().optional(),
   textChunkLimit: z.number().int().positive().optional(),
@@ -610,6 +624,8 @@ const MSTeamsConfigSchema = z
     mediaAllowHosts: z.array(z.string()).optional(),
     requireMention: z.boolean().optional(),
     historyLimit: z.number().int().min(0).optional(),
+    dmHistoryLimit: z.number().int().min(0).optional(),
+    dms: z.record(z.string(), DmConfigSchema.optional()).optional(),
     replyStyle: MSTeamsReplyStyleSchema.optional(),
     teams: z.record(z.string(), MSTeamsTeamSchema.optional()).optional(),
   })
@@ -1354,6 +1370,8 @@ export const ClawdbotSchema = z
                 groupAllowFrom: z.array(z.string()).optional(),
                 groupPolicy: GroupPolicySchema.optional().default("open"),
                 historyLimit: z.number().int().min(0).optional(),
+                dmHistoryLimit: z.number().int().min(0).optional(),
+                dms: z.record(z.string(), DmConfigSchema.optional()).optional(),
                 textChunkLimit: z.number().int().positive().optional(),
                 mediaMaxMb: z.number().int().positive().optional(),
                 blockStreaming: z.boolean().optional(),
@@ -1403,6 +1421,8 @@ export const ClawdbotSchema = z
         groupAllowFrom: z.array(z.string()).optional(),
         groupPolicy: GroupPolicySchema.optional().default("open"),
         historyLimit: z.number().int().min(0).optional(),
+        dmHistoryLimit: z.number().int().min(0).optional(),
+        dms: z.record(z.string(), DmConfigSchema.optional()).optional(),
         textChunkLimit: z.number().int().positive().optional(),
         mediaMaxMb: z.number().int().positive().optional().default(50),
         blockStreaming: z.boolean().optional(),