diff --git a/src/lib/api/projects.ts b/src/lib/api/projects.ts
index 37776f646..bfab04e8a 100644
--- a/src/lib/api/projects.ts
+++ b/src/lib/api/projects.ts
@@ -21,6 +21,8 @@ import type {
   SentryProject,
 } from "../../types/index.js";
 
+import { cacheProjectsForOrg } from "../db/project-cache.js";
+import { getCachedOrganizations } from "../db/regions.js";
 import { type AuthGuardSuccess, withAuthGuard } from "../errors.js";
 import { logger } from "../logger.js";
 import { getApiBaseUrl } from "../sentry-client.js";
@@ -81,6 +83,16 @@ export async function listProjects(orgSlug: string): Promise<SentryProject[]> {
     }
   }
 
+  // Populate project cache for shell completions (best-effort).
+  // Mirrors how listOrganizations() calls setOrgRegions().
+  try {
+    const orgs = await getCachedOrganizations();
+    const orgName = orgs.find((o) => o.slug === orgSlug)?.name ?? orgSlug;
+    cacheProjectsForOrg(orgSlug, orgName, allResults);
+  } catch {
+    // Cache population is best-effort — never fail the command
+  }
+
   return allResults;
 }
 
diff --git a/src/lib/db/project-cache.ts b/src/lib/db/project-cache.ts
index 104fef2ae..035bf42f1 100644
--- a/src/lib/db/project-cache.ts
+++ b/src/lib/db/project-cache.ts
@@ -166,6 +166,52 @@ export async function getCachedProjectsForOrg(
   }));
 }
 
+/**
+ * Batch-cache projects for an organization.
+ *
+ * Called from `listProjects()` at the API layer so every command that
+ * lists projects (project list, findProjectsByPattern, etc.) automatically
+ * seeds the completion cache. Follows the `setOrgRegions()` pattern.
+ *
+ * @param orgSlug - Organization slug
+ * @param orgName - Organization display name
+ * @param projects - Projects to cache (id, slug, name from SentryProject)
+ */
+export function cacheProjectsForOrg(
+  orgSlug: string,
+  orgName: string,
+  projects: Array<{ id: string; slug: string; name: string }>
+): void {
+  if (projects.length === 0) {
+    return;
+  }
+
+  const db = getDatabase();
+  const now = Date.now();
+
+  db.transaction(() => {
+    for (const p of projects) {
+      runUpsert(
+        db,
+        "project_cache",
+        {
+          cache_key: `list:${orgSlug}/${p.slug}`,
+          org_slug: orgSlug,
+          org_name: orgName,
+          project_slug: p.slug,
+          project_name: p.name,
+          project_id: p.id,
+          cached_at: now,
+          last_accessed: now,
+        },
+        ["cache_key"]
+      );
+    }
+  })();
+
+  maybeCleanupCaches();
+}
+
 export async function clearProjectCache(): Promise<void> {
   const db = getDatabase();
   db.query("DELETE FROM project_cache").run();
diff --git a/test/lib/db/project-cache.test.ts b/test/lib/db/project-cache.test.ts
index fbf365b7f..adf87cd99 100644
--- a/test/lib/db/project-cache.test.ts
+++ b/test/lib/db/project-cache.test.ts
@@ -6,6 +6,7 @@
 
 import { describe, expect, test } from "bun:test";
 import {
+  cacheProjectsForOrg,
   clearProjectCache,
   getCachedProject,
   getCachedProjectByDsnKey,
@@ -350,6 +351,68 @@ describe("cache key uniqueness", () => {
   });
 });
 
+describe("cacheProjectsForOrg", () => {
+  test("caches multiple projects in one call", async () => {
+    cacheProjectsForOrg("my-org", "My Org", [
+      { id: "1", slug: "frontend", name: "Frontend" },
+      { id: "2", slug: "backend", name: "Backend" },
+      { id: "3", slug: "mobile", name: "Mobile App" },
+    ]);
+
+    const result = await getCachedProjectsForOrg("my-org");
+    expect(result).toHaveLength(3);
+    expect(result).toContainEqual({
+      projectSlug: "frontend",
+      projectName: "Frontend",
+    });
+    expect(result).toContainEqual({
+      projectSlug: "backend",
+      projectName: "Backend",
+    });
+    expect(result).toContainEqual({
+      projectSlug: "mobile",
+      projectName: "Mobile App",
+    });
+  });
+
+  test("is idempotent on repeated calls", async () => {
+    const projects = [
+      { id: "1", slug: "frontend", name: "Frontend" },
+      { id: "2", slug: "backend", name: "Backend" },
+    ];
+
+    cacheProjectsForOrg("my-org", "My Org", projects);
+    cacheProjectsForOrg("my-org", "My Org", projects);
+
+    const result = await getCachedProjectsForOrg("my-org");
+    expect(result).toHaveLength(2);
+  });
+
+  test("empty array is a no-op", async () => {
+    cacheProjectsForOrg("my-org", "My Org", []);
+    const result = await getCachedProjectsForOrg("my-org");
+    expect(result).toEqual([]);
+  });
+
+  test("does not conflict with orgId:projectId cache entries", async () => {
+    await setCachedProject("org-123", "proj-456", {
+      orgSlug: "my-org",
+      orgName: "My Org",
+      projectSlug: "frontend",
+      projectName: "Frontend (by DSN)",
+    });
+
+    cacheProjectsForOrg("my-org", "My Org", [
+      { id: "456", slug: "frontend", name: "Frontend (by list)" },
+    ]);
+
+    // Both entries exist — getCachedProjectsForOrg deduplicates by slug
+    const result = await getCachedProjectsForOrg("my-org");
+    expect(result).toHaveLength(1);
+    expect(result[0]?.projectSlug).toBe("frontend");
+  });
+});
+
 describe("getCachedProjectsForOrg", () => {
   test("returns empty array when no projects for org", async () => {
     const result = await getCachedProjectsForOrg("nonexistent-org");