fix: preserve skill snapshot freshness

src/skills/service.test.ts

@@ -96,6 +96,78 @@ describe("SkillsService", () => {
     expect(after.entries.map((entry) => entry.name)).toContain("service-zero-beta");
   });
 
+  it("does not cache explicit indexes when skill watching is disabled", async () => {
+    const workspaceDir = await makeTempWorkspace();
+    await writeWorkspaceSkills(workspaceDir, [
+      { name: "service-watch-alpha", description: "Alpha workflow" },
+    ]);
+    const service = new SkillsService();
+    const roots = isolatedSkillRoots(workspaceDir);
+    const config = { skills: { load: { watch: false } } } satisfies OpenClawConfig;
+
+    const before = service.getIndex({ workspaceDir, ...roots, config, snapshotVersion: 1 });
+    await writeWorkspaceSkills(workspaceDir, [
+      { name: "service-watch-beta", description: "Beta workflow" },
+    ]);
+    const after = service.getIndex({ workspaceDir, ...roots, config, snapshotVersion: 1 });
+
+    expect(after).not.toBe(before);
+    expect(before.entries.map((entry) => entry.name)).not.toContain("service-watch-beta");
+    expect(after.entries.map((entry) => entry.name)).toContain("service-watch-beta");
+  });
+
+  it("keeps snapshots uncached even when callers pass a positive version", async () => {
+    const workspaceDir = await makeTempWorkspace();
+    await writeWorkspaceSkills(workspaceDir, [
+      { name: "service-snapshot-alpha", description: "Alpha workflow" },
+    ]);
+    const service = new SkillsService();
+    const roots = isolatedSkillRoots(workspaceDir);
+
+    const before = service.buildSnapshot(workspaceDir, { ...roots, snapshotVersion: 1 });
+    await writeWorkspaceSkills(workspaceDir, [
+      { name: "service-snapshot-beta", description: "Beta workflow" },
+    ]);
+    const after = service.buildSnapshot(workspaceDir, { ...roots, snapshotVersion: 1 });
+
+    expect(before.skills.map((skill) => skill.name)).not.toContain("service-snapshot-beta");
+    expect(after.skills.map((skill) => skill.name)).toContain("service-snapshot-beta");
+  });
+
+  it("bounds cached indexes across workspace scopes", async () => {
+    const service = new SkillsService();
+    const workspaces = await Promise.all(
+      Array.from({ length: 17 }, async (_, index) => {
+        const workspaceDir = await makeTempWorkspace();
+        await writeWorkspaceSkills(workspaceDir, [
+          { name: `service-lru-${index}`, description: "Cached workflow" },
+        ]);
+        return workspaceDir;
+      }),
+    );
+    const firstWorkspace = workspaces[0]!;
+    const first = service.getIndex({
+      workspaceDir: firstWorkspace,
+      ...isolatedSkillRoots(firstWorkspace),
+      snapshotVersion: 1,
+    });
+
+    for (const workspaceDir of workspaces.slice(1)) {
+      service.getIndex({
+        workspaceDir,
+        ...isolatedSkillRoots(workspaceDir),
+        snapshotVersion: 1,
+      });
+    }
+    const firstAgain = service.getIndex({
+      workspaceDir: firstWorkspace,
+      ...isolatedSkillRoots(firstWorkspace),
+      snapshotVersion: 1,
+    });
+
+    expect(firstAgain).not.toBe(first);
+  });
+
   it("includes plugin config in the versioned cache key", async () => {
     const workspaceDir = await makeTempWorkspace();
     const roots = isolatedSkillRoots(workspaceDir);

src/skills/service.ts

@@ -11,6 +11,8 @@ import {
   loadWorkspaceSkillEntries,
 } from "./workspace.js";
 
+const MAX_SKILL_INDEX_CACHE_ENTRIES = 16;
+
 export type SkillIndexRequest = {
   workspaceDir: string;
   config?: OpenClawConfig;
@@ -38,19 +40,22 @@ export class SkillsService {
   getIndex(request: SkillIndexRequest): SkillIndex {
     const snapshotVersion =
       request.snapshotVersion ?? getSkillsSnapshotVersion(request.workspaceDir);
-    if (!shouldCacheSkillIndex(snapshotVersion)) {
+    if (!shouldCacheSkillIndex(request, snapshotVersion)) {
       return this.loadIndex(request, buildUncachedSkillIndexCacheKey(request, snapshotVersion));
     }
     const cacheKeyParts = buildSkillIndexCacheKeyParts(request, snapshotVersion);
     const cacheKey = stringifyCacheKeyParts(cacheKeyParts);
     const cached = this.cache.get(cacheKey);
     if (cached) {
+      this.cache.delete(cacheKey);
+      this.cache.set(cacheKey, cached);
       return cached;
     }
     const index = this.loadIndex(request, cacheKey);
     this.pruneScope(cacheKeyParts.scope, cacheKey);
     this.cache.set(cacheKey, index);
     this.cacheScopes.set(cacheKey, cacheKeyParts.scope);
+    this.pruneCapacity();
     return index;
   }
 
@@ -74,9 +79,10 @@ export class SkillsService {
       snapshotVersion: opts?.snapshotVersion,
     };
     const snapshotVersion = request.snapshotVersion ?? getSkillsSnapshotVersion(workspaceDir);
-    const index = shouldCacheSkillIndex(snapshotVersion)
-      ? this.getIndex(request)
-      : this.loadIndex(request, buildUncachedSkillIndexCacheKey(request, snapshotVersion));
+    const index = this.loadIndex(
+      request,
+      buildUncachedSkillIndexCacheKey(request, snapshotVersion),
+    );
     return buildSkillSnapshotFromIndex(workspaceDir, index, opts);
   }
 
@@ -94,6 +100,17 @@ export class SkillsService {
       this.cacheScopes.delete(key);
     }
   }
+
+  private pruneCapacity(): void {
+    while (this.cache.size > MAX_SKILL_INDEX_CACHE_ENTRIES) {
+      const oldestKey = this.cache.keys().next().value;
+      if (oldestKey === undefined) {
+        break;
+      }
+      this.cache.delete(oldestKey);
+      this.cacheScopes.delete(oldestKey);
+    }
+  }
 }
 
 export const skillsService = new SkillsService();
@@ -138,8 +155,15 @@ type SkillIndexCacheKeyParts = {
   snapshotVersion: number;
 };
 
-function shouldCacheSkillIndex(snapshotVersion: number | undefined): boolean {
-  return typeof snapshotVersion === "number" && snapshotVersion > 0;
+function shouldCacheSkillIndex(
+  request: SkillIndexRequest,
+  snapshotVersion: number | undefined,
+): boolean {
+  return (
+    typeof snapshotVersion === "number" &&
+    snapshotVersion > 0 &&
+    request.config?.skills?.load?.watch !== false
+  );
 }
 
 function buildUncachedSkillIndexCacheKey(