diff --git a/packages/gateway-protocol/src/schema/agents-models-skills.test.ts b/packages/gateway-protocol/src/schema/agents-models-skills.test.ts
index 006afbea6fa..a547da4cb3b 100644
--- a/packages/gateway-protocol/src/schema/agents-models-skills.test.ts
+++ b/packages/gateway-protocol/src/schema/agents-models-skills.test.ts
@@ -1,6 +1,9 @@
 import { Value } from "typebox/value";
 import { describe, expect, it } from "vitest";
-import { ToolsEffectiveResultSchema } from "./agents-models-skills.js";
+import {
+  SkillsProposalInspectResultSchema,
+  ToolsEffectiveResultSchema,
+} from "./agents-models-skills.js";
 
 function toolsEffectiveResult() {
   return {
@@ -58,3 +61,51 @@ describe("ToolsEffectiveResultSchema", () => {
     expect(Value.Check(ToolsEffectiveResultSchema, result)).toBe(false);
   });
 });
+
+describe("SkillsProposalInspectResultSchema", () => {
+  it("accepts update proposal support file target metadata", () => {
+    const result = {
+      record: {
+        id: "proposal-1",
+        kind: "update",
+        status: "pending",
+        title: "weather-helper",
+        description: "Improve weather checks",
+        schema: "openclaw.skill-workshop.proposal.v1",
+        createdAt: "2026-05-30T00:00:00.000Z",
+        updatedAt: "2026-05-30T00:00:00.000Z",
+        createdBy: "skill-research",
+        proposedVersion: "v1",
+        draftFile: "PROPOSAL.md",
+        target: {
+          skillName: "weather-helper",
+          skillDir: "/tmp/workspace/skills/weather-helper",
+          skillFile: "/tmp/workspace/skills/weather-helper/SKILL.md",
+          skillKey: "weather-helper",
+          currentContentHash: "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
+        },
+        draftHash: "abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789",
+        scan: {
+          state: "clean",
+          scannedAt: "2026-05-30T00:00:00.000Z",
+          critical: 0,
+          warn: 0,
+          info: 0,
+          findings: [],
+        },
+        supportFiles: [
+          {
+            path: "references/weather.md",
+            sizeBytes: 42,
+            hash: "fedcba9876543210fedcba9876543210fedcba9876543210fedcba9876543210",
+            targetExisted: true,
+            targetContentHash: "123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0",
+          },
+        ],
+      },
+      content: "# Weather Helper\n",
+    };
+
+    expect(Value.Check(SkillsProposalInspectResultSchema, result)).toBe(true);
+  });
+});
diff --git a/packages/gateway-protocol/src/schema/agents-models-skills.ts b/packages/gateway-protocol/src/schema/agents-models-skills.ts
index 27251ac96f8..a848c97c833 100644
--- a/packages/gateway-protocol/src/schema/agents-models-skills.ts
+++ b/packages/gateway-protocol/src/schema/agents-models-skills.ts
@@ -514,6 +514,8 @@ const SkillProposalSupportFileSchema = Type.Object(
     path: NonEmptyString,
     sizeBytes: Type.Integer({ minimum: 0, maximum: 262_144 }),
     hash: Sha256String,
+    targetExisted: Type.Optional(Type.Boolean()),
+    targetContentHash: Type.Optional(Sha256String),
   },
   { additionalProperties: false },
 );
diff --git a/src/agents/openclaw-tools.ts b/src/agents/openclaw-tools.ts
index 22813a44f1a..01d4cb5aa12 100644
--- a/src/agents/openclaw-tools.ts
+++ b/src/agents/openclaw-tools.ts
@@ -442,11 +442,15 @@ export function createOpenClawTools(
       sessionAgentId,
       config: resolvedConfig,
     }),
-    createSkillResearchTool({
-      workspaceDir,
-      config: resolvedConfig,
-      agentId: sessionAgentId,
-    }),
+    ...(options?.sandboxed
+      ? []
+      : [
+          createSkillResearchTool({
+            workspaceDir,
+            config: resolvedConfig,
+            agentId: sessionAgentId,
+          }),
+        ]),
     ...(includeUpdatePlanTool ? [createUpdatePlanTool()] : []),
     createSessionsListTool({
       agentSessionKey: options?.agentSessionKey,
diff --git a/src/agents/tools/skill-research-tool.test.ts b/src/agents/tools/skill-research-tool.test.ts
index 56cdc9d029e..53242c8ac42 100644
--- a/src/agents/tools/skill-research-tool.test.ts
+++ b/src/agents/tools/skill-research-tool.test.ts
@@ -32,6 +32,18 @@ describe("skill_research tool", () => {
     expect(tools.some((tool) => tool.name === "skill_research")).toBe(true);
   });
 
+  it("is not exposed from sandboxed OpenClaw tool sets", async () => {
+    const workspaceDir = await tempDirs.make("openclaw-skill-research-tool-");
+    const tools = createOpenClawTools({
+      workspaceDir,
+      config: {},
+      disablePluginTools: true,
+      sandboxed: true,
+    });
+
+    expect(tools.some((tool) => tool.name === "skill_research")).toBe(false);
+  });
+
   it("creates pending skill proposals without applying them", async () => {
     const workspaceDir = await tempDirs.make("openclaw-skill-research-tool-");
     const tool = createSkillResearchTool({ workspaceDir, config: {}, agentId: "main" });
diff --git a/src/skills/workshop/service.test.ts b/src/skills/workshop/service.test.ts
index 22f6fd1b69d..73e7d34472f 100644
--- a/src/skills/workshop/service.test.ts
+++ b/src/skills/workshop/service.test.ts
@@ -415,6 +415,44 @@ describe("skill workshop proposals", () => {
     );
   });
 
+  it("keeps update proposal support baselines when revising", async () => {
+    const workspaceDir = await makeWorkspace();
+    const skillDir = path.join(workspaceDir, "skills", "support-revise-stale");
+    await writeSkill({
+      dir: skillDir,
+      name: "support-revise-stale",
+      description: "Detect stale support files during revision",
+      body: "# Support Revise Stale\n\nOld checklist.\n",
+    });
+    await fs.mkdir(path.join(skillDir, "references"), { recursive: true });
+    await fs.writeFile(path.join(skillDir, "references", "qa.md"), "Old support file.\n", "utf8");
+    const proposal = await proposeUpdateSkill({
+      workspaceDir,
+      skillName: "support-revise-stale",
+      content: "# Support Revise Stale\n\nNew checklist.\n",
+      supportFiles: [
+        {
+          path: "references/qa.md",
+          content: "New support file.\n",
+        },
+      ],
+    });
+
+    await fs.writeFile(path.join(skillDir, "references", "qa.md"), "Changed elsewhere.\n", "utf8");
+
+    await expect(
+      reviseSkillProposal({
+        workspaceDir,
+        proposalId: proposal.record.id,
+        content: "# Support Revise Stale\n\nRevised checklist.\n",
+      }),
+    ).rejects.toThrow("Target support file changed after proposal creation");
+    expect((await inspectSkillProposal(proposal.record.id))?.record.status).toBe("stale");
+    await expect(fs.readFile(path.join(skillDir, "references", "qa.md"), "utf8")).resolves.toBe(
+      "Changed elsewhere.\n",
+    );
+  });
+
   it("rejects and quarantines proposals without touching active skills", async () => {
     const workspaceDir = await makeWorkspace();
     const rejected = await proposeCreateSkill({
diff --git a/src/skills/workshop/service.ts b/src/skills/workshop/service.ts
index 191af7fcf8e..68628d6a6fc 100644
--- a/src/skills/workshop/service.ts
+++ b/src/skills/workshop/service.ts
@@ -339,6 +339,7 @@ export async function reviseSkillProposal(
       await markProposalStale(record, "Target skill changed after proposal creation.");
       throw new Error("Target skill changed after proposal creation; proposal marked stale.");
     }
+    await assertSupportTargetsUnchanged(record);
   }
 
   const supportFiles =
@@ -670,6 +671,22 @@ async function assertSupportTargetUnchanged(params: {
   }
 }
 
+async function assertSupportTargetsUnchanged(record: SkillProposalRecord): Promise<void> {
+  if (record.kind !== "update" || !record.supportFiles) {
+    return;
+  }
+  for (const file of record.supportFiles) {
+    if (file.targetExisted === undefined) {
+      continue;
+    }
+    const currentContent = await readWorkspaceSupportFile({
+      skillDir: record.target.skillDir,
+      relativePath: file.path,
+    });
+    await assertSupportTargetUnchanged({ record, file, currentContent });
+  }
+}
+
 async function readRequiredProposal(
   proposalId: string,
   workspaceDir?: string,