diff --git a/src/gateway/session-utils.ts b/src/gateway/session-utils.ts
index 969c60c378c..e16777f4f2c 100644
--- a/src/gateway/session-utils.ts
+++ b/src/gateway/session-utils.ts
@@ -810,6 +810,7 @@ export function listSessionsFromStore(params: {
       const model = resolvedModel.model ?? DEFAULT_MODEL;
       return {
         key,
+        spawnedBy: entry?.spawnedBy,
         entry,
         kind: classifySessionKey(key, entry),
         label: entry?.label,
diff --git a/src/gateway/session-utils.types.ts b/src/gateway/session-utils.types.ts
index 711a1997f22..80873b0000c 100644
--- a/src/gateway/session-utils.types.ts
+++ b/src/gateway/session-utils.types.ts
@@ -15,6 +15,7 @@ export type GatewaySessionsDefaults = {
 
 export type GatewaySessionRow = {
   key: string;
+  spawnedBy?: string;
   kind: "direct" | "group" | "global" | "unknown";
   label?: string;
   displayName?: string;
diff --git a/ui/src/ui/chat/slash-command-executor.node.test.ts b/ui/src/ui/chat/slash-command-executor.node.test.ts
index 2e47b79aa43..2b8aa9d5f86 100644
--- a/ui/src/ui/chat/slash-command-executor.node.test.ts
+++ b/ui/src/ui/chat/slash-command-executor.node.test.ts
@@ -3,11 +3,13 @@ import type { GatewayBrowserClient } from "../gateway.ts";
 import type { GatewaySessionRow } from "../types.ts";
 import { executeSlashCommand } from "./slash-command-executor.ts";
 
-function row(key: string): GatewaySessionRow {
+function row(key: string, overrides?: Partial<GatewaySessionRow>): GatewaySessionRow {
   return {
     key,
+    spawnedBy: overrides?.spawnedBy,
     kind: "direct",
     updatedAt: null,
+    ...overrides,
   };
 }
 
@@ -18,8 +20,11 @@ describe("executeSlashCommand /kill", () => {
         return {
           sessions: [
             row("main"),
-            row("agent:main:subagent:one"),
-            row("agent:main:subagent:parent:subagent:child"),
+            row("agent:main:subagent:one", { spawnedBy: "main" }),
+            row("agent:main:subagent:parent", { spawnedBy: "main" }),
+            row("agent:main:subagent:parent:subagent:child", {
+              spawnedBy: "agent:main:subagent:parent",
+            }),
             row("agent:other:main"),
           ],
         };
@@ -37,12 +42,15 @@ describe("executeSlashCommand /kill", () => {
       "all",
     );
 
-    expect(result.content).toBe("Aborted 2 sub-agent sessions.");
+    expect(result.content).toBe("Aborted 3 sub-agent sessions.");
     expect(request).toHaveBeenNthCalledWith(1, "sessions.list", {});
     expect(request).toHaveBeenNthCalledWith(2, "chat.abort", {
       sessionKey: "agent:main:subagent:one",
     });
     expect(request).toHaveBeenNthCalledWith(3, "chat.abort", {
+      sessionKey: "agent:main:subagent:parent",
+    });
+    expect(request).toHaveBeenNthCalledWith(4, "chat.abort", {
       sessionKey: "agent:main:subagent:parent:subagent:child",
     });
   });
@@ -52,9 +60,9 @@ describe("executeSlashCommand /kill", () => {
       if (method === "sessions.list") {
         return {
           sessions: [
-            row("agent:main:subagent:one"),
-            row("agent:main:subagent:two"),
-            row("agent:other:subagent:three"),
+            row("agent:main:subagent:one", { spawnedBy: "agent:main:main" }),
+            row("agent:main:subagent:two", { spawnedBy: "agent:main:main" }),
+            row("agent:other:subagent:three", { spawnedBy: "agent:other:main" }),
           ],
         };
       }
@@ -86,9 +94,11 @@ describe("executeSlashCommand /kill", () => {
       if (method === "sessions.list") {
         return {
           sessions: [
-            row("agent:main:subagent:parent"),
-            row("agent:main:subagent:parent:subagent:child"),
-            row("agent:main:subagent:sibling"),
+            row("agent:main:subagent:parent", { spawnedBy: "agent:main:main" }),
+            row("agent:main:subagent:parent:subagent:child", {
+              spawnedBy: "agent:main:subagent:parent",
+            }),
+            row("agent:main:subagent:sibling", { spawnedBy: "agent:main:main" }),
           ],
         };
       }
@@ -116,7 +126,10 @@ describe("executeSlashCommand /kill", () => {
     const request = vi.fn(async (method: string, _payload?: unknown) => {
       if (method === "sessions.list") {
         return {
-          sessions: [row("agent:main:subagent:one"), row("agent:main:subagent:two")],
+          sessions: [
+            row("agent:main:subagent:one", { spawnedBy: "agent:main:main" }),
+            row("agent:main:subagent:two", { spawnedBy: "agent:main:main" }),
+          ],
         };
       }
       if (method === "chat.abort") {
@@ -148,9 +161,9 @@ describe("executeSlashCommand /kill", () => {
         return {
           sessions: [
             row("main"),
-            row("agent:main:subagent:one"),
-            row("agent:main:subagent:two"),
-            row("agent:other:subagent:three"),
+            row("agent:main:subagent:one", { spawnedBy: "agent:main:main" }),
+            row("agent:main:subagent:two", { spawnedBy: "agent:main:main" }),
+            row("agent:other:subagent:three", { spawnedBy: "agent:other:main" }),
           ],
         };
       }
@@ -176,4 +189,128 @@ describe("executeSlashCommand /kill", () => {
       sessionKey: "agent:main:subagent:two",
     });
   });
+
+  it("does not abort unrelated same-agent subagents from another root session", async () => {
+    const request = vi.fn(async (method: string, _payload?: unknown) => {
+      if (method === "sessions.list") {
+        return {
+          sessions: [
+            row("agent:main:main"),
+            row("agent:main:subagent:mine", { spawnedBy: "agent:main:main" }),
+            row("agent:main:subagent:mine:subagent:child", {
+              spawnedBy: "agent:main:subagent:mine",
+            }),
+            row("agent:main:subagent:other-root", {
+              spawnedBy: "agent:main:discord:dm:alice",
+            }),
+          ],
+        };
+      }
+      if (method === "chat.abort") {
+        return { ok: true, aborted: true };
+      }
+      throw new Error(`unexpected method: ${method}`);
+    });
+
+    const result = await executeSlashCommand(
+      { request } as unknown as GatewayBrowserClient,
+      "agent:main:main",
+      "kill",
+      "all",
+    );
+
+    expect(result.content).toBe("Aborted 2 sub-agent sessions.");
+    expect(request).toHaveBeenNthCalledWith(1, "sessions.list", {});
+    expect(request).toHaveBeenNthCalledWith(2, "chat.abort", {
+      sessionKey: "agent:main:subagent:mine",
+    });
+    expect(request).toHaveBeenNthCalledWith(3, "chat.abort", {
+      sessionKey: "agent:main:subagent:mine:subagent:child",
+    });
+  });
+});
+
+describe("executeSlashCommand directives", () => {
+  it("reports the current thinking level for bare /think", async () => {
+    const request = vi.fn(async (method: string, _payload?: unknown) => {
+      if (method === "sessions.list") {
+        return {
+          sessions: [
+            row("agent:main:main", {
+              modelProvider: "openai",
+              model: "gpt-4.1-mini",
+            }),
+          ],
+        };
+      }
+      if (method === "models.list") {
+        return {
+          models: [{ id: "gpt-4.1-mini", provider: "openai", reasoning: true }],
+        };
+      }
+      throw new Error(`unexpected method: ${method}`);
+    });
+
+    const result = await executeSlashCommand(
+      { request } as unknown as GatewayBrowserClient,
+      "agent:main:main",
+      "think",
+      "",
+    );
+
+    expect(result.content).toBe(
+      "Current thinking level: low.\nOptions: off, minimal, low, medium, high, adaptive.",
+    );
+    expect(request).toHaveBeenNthCalledWith(1, "sessions.list", {});
+    expect(request).toHaveBeenNthCalledWith(2, "models.list", {});
+  });
+
+  it("accepts minimal and xhigh thinking levels", async () => {
+    const request = vi.fn().mockResolvedValueOnce({ ok: true }).mockResolvedValueOnce({ ok: true });
+
+    const minimal = await executeSlashCommand(
+      { request } as unknown as GatewayBrowserClient,
+      "agent:main:main",
+      "think",
+      "minimal",
+    );
+    const xhigh = await executeSlashCommand(
+      { request } as unknown as GatewayBrowserClient,
+      "agent:main:main",
+      "think",
+      "xhigh",
+    );
+
+    expect(minimal.content).toBe("Thinking level set to **minimal**.");
+    expect(xhigh.content).toBe("Thinking level set to **xhigh**.");
+    expect(request).toHaveBeenNthCalledWith(1, "sessions.patch", {
+      key: "agent:main:main",
+      thinkingLevel: "minimal",
+    });
+    expect(request).toHaveBeenNthCalledWith(2, "sessions.patch", {
+      key: "agent:main:main",
+      thinkingLevel: "xhigh",
+    });
+  });
+
+  it("reports the current verbose level for bare /verbose", async () => {
+    const request = vi.fn(async (method: string, _payload?: unknown) => {
+      if (method === "sessions.list") {
+        return {
+          sessions: [row("agent:main:main", { verboseLevel: "full" })],
+        };
+      }
+      throw new Error(`unexpected method: ${method}`);
+    });
+
+    const result = await executeSlashCommand(
+      { request } as unknown as GatewayBrowserClient,
+      "agent:main:main",
+      "verbose",
+      "",
+    );
+
+    expect(result.content).toBe("Current verbose level: full.\nOptions: on, full, off.");
+    expect(request).toHaveBeenNthCalledWith(1, "sessions.list", {});
+  });
 });
diff --git a/ui/src/ui/chat/slash-command-executor.ts b/ui/src/ui/chat/slash-command-executor.ts
index ce2a43a8f41..51db61a0ba2 100644
--- a/ui/src/ui/chat/slash-command-executor.ts
+++ b/ui/src/ui/chat/slash-command-executor.ts
@@ -4,7 +4,14 @@
  */
 
 import type { ModelCatalogEntry } from "../../../../src/agents/model-catalog.js";
+import { resolveThinkingDefault } from "../../../../src/agents/model-selection.js";
+import {
+  formatThinkingLevels,
+  normalizeThinkLevel,
+  normalizeVerboseLevel,
+} from "../../../../src/auto-reply/thinking.js";
 import type { HealthSummary } from "../../../../src/commands/health.js";
+import type { OpenClawConfig } from "../../../../src/config/config.js";
 import {
   DEFAULT_AGENT_ID,
   DEFAULT_MAIN_KEY,
@@ -166,18 +173,31 @@ async function executeThink(
   sessionKey: string,
   args: string,
 ): Promise<SlashCommandResult> {
-  const valid = ["off", "low", "medium", "high"];
-  const level = args.trim().toLowerCase();
-
-  if (!level) {
-    return {
-      content: `Usage: \`/think <${valid.join("|")}>\``,
-    };
+  const rawLevel = args.trim();
+  if (!rawLevel) {
+    try {
+      const { session, models } = await loadThinkingCommandState(client, sessionKey);
+      return {
+        content: formatDirectiveOptions(
+          `Current thinking level: ${resolveCurrentThinkingLevel(session, models)}.`,
+          formatThinkingLevels(session?.modelProvider, session?.model),
+        ),
+      };
+    } catch (err) {
+      return { content: `Failed to get thinking level: ${String(err)}` };
+    }
   }
-  if (!valid.includes(level)) {
-    return {
-      content: `Invalid thinking level \`${level}\`. Choose: ${valid.map((v) => `\`${v}\``).join(", ")}`,
-    };
+
+  const level = normalizeThinkLevel(rawLevel);
+  if (!level) {
+    try {
+      const session = await loadCurrentSession(client, sessionKey);
+      return {
+        content: `Unrecognized thinking level "${rawLevel}". Valid levels: ${formatThinkingLevels(session?.modelProvider, session?.model)}.`,
+      };
+    } catch (err) {
+      return { content: `Failed to validate thinking level: ${String(err)}` };
+    }
   }
 
   try {
@@ -196,17 +216,25 @@ async function executeVerbose(
   sessionKey: string,
   args: string,
 ): Promise<SlashCommandResult> {
-  const valid = ["on", "off", "full"];
-  const level = args.trim().toLowerCase();
+  const rawLevel = args.trim();
+  if (!rawLevel) {
+    try {
+      const session = await loadCurrentSession(client, sessionKey);
+      return {
+        content: formatDirectiveOptions(
+          `Current verbose level: ${normalizeVerboseLevel(session?.verboseLevel) ?? "off"}.`,
+          "on, full, off",
+        ),
+      };
+    } catch (err) {
+      return { content: `Failed to get verbose level: ${String(err)}` };
+    }
+  }
 
+  const level = normalizeVerboseLevel(rawLevel);
   if (!level) {
     return {
-      content: `Usage: \`/verbose <${valid.join("|")}>\``,
-    };
-  }
-  if (!valid.includes(level)) {
-    return {
-      content: `Invalid verbose level \`${level}\`. Choose: ${valid.map((v) => `\`${v}\``).join(", ")}`,
+      content: `Unrecognized verbose level "${rawLevel}". Valid levels: off, on, full.`,
     };
   }
 
@@ -354,6 +382,7 @@ function resolveKillTargets(
   const currentAgentId =
     currentParsed?.agentId ??
     (normalizedCurrentSessionKey === DEFAULT_MAIN_KEY ? DEFAULT_AGENT_ID : undefined);
+  const sessionIndex = buildSessionIndex(sessions);
   for (const session of sessions) {
     const key = session?.key?.trim();
     if (!key || !isSubagentSessionKey(key)) {
@@ -364,6 +393,7 @@ function resolveKillTargets(
     const belongsToCurrentSession = isWithinCurrentSessionSubtree(
       normalizedKey,
       normalizedCurrentSessionKey,
+      sessionIndex,
       currentAgentId,
       parsed?.agentId,
     );
@@ -384,19 +414,125 @@ function resolveKillTargets(
 function isWithinCurrentSessionSubtree(
   candidateSessionKey: string,
   currentSessionKey: string,
+  sessionIndex: Map<string, GatewaySessionRow>,
   currentAgentId: string | undefined,
   candidateAgentId: string | undefined,
 ): boolean {
   if (!currentAgentId || candidateAgentId !== currentAgentId) {
     return false;
   }
-  if (!isSubagentSessionKey(currentSessionKey)) {
-    return true;
+
+  const currentAliases = resolveEquivalentSessionKeys(currentSessionKey, currentAgentId);
+  const seen = new Set<string>();
+  let parentSessionKey = normalizeSessionKey(sessionIndex.get(candidateSessionKey)?.spawnedBy);
+  while (parentSessionKey && !seen.has(parentSessionKey)) {
+    if (currentAliases.has(parentSessionKey)) {
+      return true;
+    }
+    seen.add(parentSessionKey);
+    parentSessionKey = normalizeSessionKey(sessionIndex.get(parentSessionKey)?.spawnedBy);
   }
-  return (
-    candidateSessionKey === currentSessionKey ||
-    candidateSessionKey.startsWith(`${currentSessionKey}:subagent:`)
-  );
+
+  // Older gateways may not include spawnedBy on session rows yet; keep prefix
+  // matching for nested subagent sessions as a compatibility fallback.
+  return isSubagentSessionKey(currentSessionKey)
+    ? candidateSessionKey.startsWith(`${currentSessionKey}:subagent:`)
+    : false;
+}
+
+function buildSessionIndex(sessions: GatewaySessionRow[]): Map<string, GatewaySessionRow> {
+  const index = new Map<string, GatewaySessionRow>();
+  for (const session of sessions) {
+    const normalizedKey = normalizeSessionKey(session?.key);
+    if (!normalizedKey) {
+      continue;
+    }
+    index.set(normalizedKey, session);
+  }
+  return index;
+}
+
+function normalizeSessionKey(key?: string | null): string | undefined {
+  const normalized = key?.trim().toLowerCase();
+  return normalized || undefined;
+}
+
+function resolveEquivalentSessionKeys(
+  currentSessionKey: string,
+  currentAgentId: string | undefined,
+): Set<string> {
+  const keys = new Set<string>([currentSessionKey]);
+  if (currentAgentId === DEFAULT_AGENT_ID) {
+    const canonicalDefaultMain = `agent:${DEFAULT_AGENT_ID}:main`;
+    if (currentSessionKey === DEFAULT_MAIN_KEY) {
+      keys.add(canonicalDefaultMain);
+    } else if (currentSessionKey === canonicalDefaultMain) {
+      keys.add(DEFAULT_MAIN_KEY);
+    }
+  }
+  return keys;
+}
+
+function formatDirectiveOptions(text: string, options: string): string {
+  return `${text}\nOptions: ${options}.`;
+}
+
+async function loadCurrentSession(
+  client: GatewayBrowserClient,
+  sessionKey: string,
+): Promise<GatewaySessionRow | undefined> {
+  const sessions = await client.request<SessionsListResult>("sessions.list", {});
+  const normalizedSessionKey = normalizeSessionKey(sessionKey);
+  const currentAgentId =
+    parseAgentSessionKey(normalizedSessionKey ?? "")?.agentId ??
+    (normalizedSessionKey === DEFAULT_MAIN_KEY ? DEFAULT_AGENT_ID : undefined);
+  const aliases = normalizedSessionKey
+    ? resolveEquivalentSessionKeys(normalizedSessionKey, currentAgentId)
+    : new Set<string>();
+  return sessions?.sessions?.find((session: GatewaySessionRow) => {
+    const key = normalizeSessionKey(session.key);
+    return key ? aliases.has(key) : false;
+  });
+}
+
+async function loadThinkingCommandState(client: GatewayBrowserClient, sessionKey: string) {
+  const [sessions, models] = await Promise.all([
+    client.request<SessionsListResult>("sessions.list", {}),
+    client.request<{ models: ModelCatalogEntry[] }>("models.list", {}),
+  ]);
+  const normalizedSessionKey = normalizeSessionKey(sessionKey);
+  const currentAgentId =
+    parseAgentSessionKey(normalizedSessionKey ?? "")?.agentId ??
+    (normalizedSessionKey === DEFAULT_MAIN_KEY ? DEFAULT_AGENT_ID : undefined);
+  const aliases = normalizedSessionKey
+    ? resolveEquivalentSessionKeys(normalizedSessionKey, currentAgentId)
+    : new Set<string>();
+  return {
+    session: sessions?.sessions?.find((session: GatewaySessionRow) => {
+      const key = normalizeSessionKey(session.key);
+      return key ? aliases.has(key) : false;
+    }),
+    models: models?.models ?? [],
+  };
+}
+
+function resolveCurrentThinkingLevel(
+  session: GatewaySessionRow | undefined,
+  models: ModelCatalogEntry[],
+): string {
+  const persisted = normalizeThinkLevel(session?.thinkingLevel);
+  if (persisted) {
+    return persisted;
+  }
+  if (!session?.modelProvider || !session.model) {
+    return "off";
+  }
+  return resolveThinkingDefault({
+    cfg: {} as OpenClawConfig,
+    provider: session.modelProvider,
+    model: session.model,
+    catalog: models,
+  });
 }
 
 function fmtTokens(n: number): string {
diff --git a/ui/src/ui/chat/slash-commands.node.test.ts b/ui/src/ui/chat/slash-commands.node.test.ts
new file mode 100644
index 00000000000..cb07109df9f
--- /dev/null
+++ b/ui/src/ui/chat/slash-commands.node.test.ts
@@ -0,0 +1,26 @@
+import { describe, expect, it } from "vitest";
+import { parseSlashCommand } from "./slash-commands.ts";
+
+describe("parseSlashCommand", () => {
+  it("parses commands with an optional colon separator", () => {
+    expect(parseSlashCommand("/think: high")).toMatchObject({
+      command: { name: "think" },
+      args: "high",
+    });
+    expect(parseSlashCommand("/think:high")).toMatchObject({
+      command: { name: "think" },
+      args: "high",
+    });
+    expect(parseSlashCommand("/help:")).toMatchObject({
+      command: { name: "help" },
+      args: "",
+    });
+  });
+
+  it("still parses space-delimited commands", () => {
+    expect(parseSlashCommand("/verbose full")).toMatchObject({
+      command: { name: "verbose" },
+      args: "full",
+    });
+  });
+});
diff --git a/ui/src/ui/chat/slash-commands.ts b/ui/src/ui/chat/slash-commands.ts
index 7fc4fd6a7c0..27acd90025e 100644
--- a/ui/src/ui/chat/slash-commands.ts
+++ b/ui/src/ui/chat/slash-commands.ts
@@ -77,7 +77,7 @@ export const SLASH_COMMANDS: SlashCommandDef[] = [
     icon: "brain",
     category: "model",
     executeLocal: true,
-    argOptions: ["off", "low", "medium", "high"],
+    argOptions: ["off", "minimal", "low", "medium", "high", "xhigh", "adaptive"],
   },
   {
     name: "verbose",
@@ -192,7 +192,7 @@ export type ParsedSlashCommand = {
 
 /**
  * Parse a message as a slash command. Returns null if it doesn't match.
- * Supports `/command` and `/command args...`.
+ * Supports `/command`, `/command args...`, and `/command: args...`.
  */
 export function parseSlashCommand(text: string): ParsedSlashCommand | null {
   const trimmed = text.trim();
@@ -200,9 +200,14 @@ export function parseSlashCommand(text: string): ParsedSlashCommand | null {
     return null;
   }
 
-  const spaceIdx = trimmed.indexOf(" ");
-  const name = spaceIdx === -1 ? trimmed.slice(1) : trimmed.slice(1, spaceIdx);
-  const args = spaceIdx === -1 ? "" : trimmed.slice(spaceIdx + 1).trim();
+  const body = trimmed.slice(1);
+  const firstSeparator = body.search(/[\s:]/u);
+  const name = firstSeparator === -1 ? body : body.slice(0, firstSeparator);
+  let remainder = firstSeparator === -1 ? "" : body.slice(firstSeparator).trimStart();
+  if (remainder.startsWith(":")) {
+    remainder = remainder.slice(1).trimStart();
+  }
+  const args = remainder.trim();
 
   if (!name) {
     return null;
diff --git a/ui/src/ui/types.ts b/ui/src/ui/types.ts
index f87b498100a..7cde5adee61 100644
--- a/ui/src/ui/types.ts
+++ b/ui/src/ui/types.ts
@@ -395,6 +395,7 @@ export type AgentsFilesSetResult = {
 
 export type GatewaySessionRow = {
   key: string;
+  spawnedBy?: string;
   kind: "direct" | "group" | "global" | "unknown";
   label?: string;
   displayName?: string;