diff --git a/server/lib/providerVendors.js b/server/lib/providerVendors.js
index a854f95ba1..708d81edc0 100644
--- a/server/lib/providerVendors.js
+++ b/server/lib/providerVendors.js
@@ -629,6 +629,11 @@ export function buildVendorCliArgs(provider, baseArgs, { model, effort }) {
   return vendor.cliArgs(baseArgs, { model, effort, provider });
 }
 
+/** How a provider names itself in an error a user has to act on. */
+function providerLabel(provider) {
+  return provider?.id || provider?.command || 'unknown';
+}
+
 /**
  * `buildCliSpawnConfig` (agentCliSpawning.js): full `{ command, args,
  * stdinMode, streamFormat? }` shape per vendor. Requires `spawnArgs` to be
@@ -641,7 +646,7 @@ export function buildVendorSpawnConfig(provider, ctx) {
   if (posture) {
     const recipe = publicReviewRecipe(provider, posture);
     if (!recipe) {
-      throw new Error(`Provider '${provider?.id || provider?.command || 'unknown'}' has no enforced ${posture} public-review posture`);
+      throw new Error(`Provider '${providerLabel(provider)}' has no enforced ${posture} public-review posture`);
     }
     return recipe.spawnArgs(provider, ctx);
   }
@@ -678,6 +683,30 @@ export function supportsPublicReviewPosture(provider, posture, { tui = false } =
   return Boolean(publicReviewRecipe(provider, posture));
 }
 
+/**
+ * The spawn-time gate for a public-content stage, as a block or `null`.
+ *
+ * Takes the POSTURE (what the stage requires), not a boolean, because the
+ * caller's posture is `null` for every ordinary task — and `null` has no
+ * recipe, so asking `supportsPublicReviewPosture` about it answers "false"
+ * for work that was never public-content at all. Deciding here keeps the
+ * "no posture requested" case explicit instead of a caller-side `&&` that a
+ * refactor can drop (it was, in #5830: every ordinary agent task blocked with
+ * "has no enforced null public-content review mode").
+ *
+ * @returns {{ reason: string, category: string }|null}
+ */
+export function publicReviewProviderBlock(provider, posture, { tui = false } = {}) {
+  if (!posture) return null;
+  if (supportsPublicReviewPosture(provider, posture, { tui })) return null;
+  return {
+    reason: `Provider '${providerLabel(provider)}' has no enforced ${posture} public-content review mode`,
+    category: posture === PUBLIC_REVIEW_ACTIONS_POSTURE
+      ? 'public-review-actions-provider-unsupported'
+      : 'public-review-provider-unsupported',
+  };
+}
+
 /** Whether a provider can run a tool-free public-content stage. */
 export function supportsPublicReviewProvider(provider, options) {
   return supportsPublicReviewPosture(provider, PUBLIC_REVIEW_NO_TOOL_POSTURE, options);
diff --git a/server/lib/providerVendors.publicReview.test.js b/server/lib/providerVendors.publicReview.test.js
index 1fabe5b8e6..3375c2d18e 100644
--- a/server/lib/providerVendors.publicReview.test.js
+++ b/server/lib/providerVendors.publicReview.test.js
@@ -9,6 +9,7 @@ import {
 import {
   buildVendorSpawnConfig,
   publicReviewPosturesForProvider,
+  publicReviewProviderBlock,
   supportsPublicReviewProvider,
   supportsPublicReviewActionsProvider,
 } from './providerVendors.js';
@@ -40,6 +41,37 @@ describe('public-review provider postures', () => {
     expect(publicReviewPosturesForProvider(localClaude)).toEqual([PUBLIC_REVIEW_NO_TOOL_POSTURE]);
   });
 
+  // Regression (#5830): the spawn gate passes the posture a STAGE requires,
+  // which is `null` for every ordinary agent task. Answering "unsupported" for
+  // a task that requested no posture blocked all normal work — scheduled tasks
+  // included — with "has no enforced null public-content review mode".
+  it('does not block a task that requested no posture', () => {
+    expect(publicReviewProviderBlock(codex, null)).toBeNull();
+    expect(publicReviewProviderBlock(codex, undefined)).toBeNull();
+    // The transport is irrelevant when nothing is being enforced: a TUI session
+    // and an api provider run ordinary tasks all day.
+    expect(publicReviewProviderBlock({ ...codex, type: 'tui' }, null, { tui: true })).toBeNull();
+    expect(publicReviewProviderBlock({ ...codex, type: 'api' }, null)).toBeNull();
+  });
+
+  it('blocks a requested posture the provider has no recipe for, naming that posture', () => {
+    expect(publicReviewProviderBlock(codex, PUBLIC_REVIEW_NO_TOOL_POSTURE)).toBeNull();
+    expect(publicReviewProviderBlock(codex, PUBLIC_REVIEW_ACTIONS_POSTURE)).toBeNull();
+
+    // claude has permission modes but no sandbox flag — tool-free only.
+    expect(publicReviewProviderBlock(localClaude, PUBLIC_REVIEW_NO_TOOL_POSTURE)).toBeNull();
+    expect(publicReviewProviderBlock(localClaude, PUBLIC_REVIEW_ACTIONS_POSTURE)).toEqual({
+      reason: "Provider 'claude-ollama' has no enforced sandboxed-actions public-content review mode",
+      category: 'public-review-actions-provider-unsupported',
+    });
+
+    // A TUI session has no enforced argv, whatever its vendor row declares.
+    expect(publicReviewProviderBlock({ ...codex, type: 'tui' }, PUBLIC_REVIEW_NO_TOOL_POSTURE, { tui: true })).toEqual({
+      reason: "Provider 'codex-cli' has no enforced no-tool public-content review mode",
+      category: 'public-review-provider-unsupported',
+    });
+  });
+
   it('fails closed for transports and vendors with no maintained recipe', () => {
     // A TUI session and an HTTP api provider have no enforced argv at all.
     expect(publicReviewPosturesForProvider({ ...codex, type: 'tui' }, { tui: true })).toEqual([]);
diff --git a/server/services/agentLifecycle.js b/server/services/agentLifecycle.js
index 8c1feb14c6..c0a33fd070 100644
--- a/server/services/agentLifecycle.js
+++ b/server/services/agentLifecycle.js
@@ -62,7 +62,7 @@ import { cliProviderAuthDescriptor } from '../lib/processEnv.js';
 import { PROVIDER_TYPES } from '../lib/aiToolkit/constants.js';
 import { buildCliSpawnConfig, isClaudeCliProvider, isTuiProvider, getClaudeSettingsEnv, spawnDirectly } from './agentCliSpawning.js';
 import { buildTuiSpawnConfig, spawnTuiAgent } from './agentTuiSpawning.js';
-import { supportsPublicReviewPosture, publicReviewPostureForProfile, PUBLIC_REVIEW_NO_TOOL_POSTURE } from '../lib/providerVendors.js';
+import { publicReviewProviderBlock, publicReviewPostureForProfile, PUBLIC_REVIEW_NO_TOOL_POSTURE } from '../lib/providerVendors.js';
 import { PUBLIC_REVIEW_ACTIONS_EXECUTION_PROFILE } from '../lib/agentExecutionProfiles.js';
 import { formatPublicReviewInputPrompt } from '../lib/modelAbuseGuard.js';
 import { materializePublicReviewInput, materializePublicReviewPatches, readPublicReviewInputSnapshot, validatePublicReviewModel } from './modelAbuseGuard.js';
@@ -463,15 +463,17 @@ async function runAgentSpawn(task) {
     // One posture check for both stages. Eligibility is declared by the vendor
     // row and re-asserted HERE, at spawn time, because a schedule or API
     // payload can be edited without the browser: the picker is a convenience,
-    // never the enforcement.
-    if (!supportsPublicReviewPosture(provider, publicReviewPosture, { tui: isTui })) {
-      const reason = `Provider '${provider?.id || provider?.command || 'unknown'}' has no enforced ${publicReviewPosture} public-content review mode`;
+    // never the enforcement. The helper owns the "no posture requested" case,
+    // so an ordinary task (posture `null`) passes straight through (#5830).
+    const postureBlock = publicReviewProviderBlock(provider, publicReviewPosture, { tui: isTui });
+    if (postureBlock) {
+      const { reason, category } = postureBlock;
       await updateTask(task.id, {
         status: 'blocked',
         metadata: {
           ...task.metadata,
           blockedReason: reason,
-          blockedCategory: publicReviewActions ? 'public-review-actions-provider-unsupported' : 'public-review-provider-unsupported',
+          blockedCategory: category,
           blockedAt: new Date().toISOString(),
         },
       }, task.taskType || 'user').catch(() => {});
diff --git a/server/services/agentLifecycle.test.js b/server/services/agentLifecycle.test.js
index 33c323c43e..3cfd802331 100644
--- a/server/services/agentLifecycle.test.js
+++ b/server/services/agentLifecycle.test.js
@@ -308,14 +308,35 @@ describe('agentLifecycle — guard wiring', () => {
     expect(AGENT_LIFECYCLE_SRC).toContain('public-review-security-scan-incomplete');
     expect(AGENT_LIFECYCLE_SRC).toContain('public-review-no-cleared-prs');
     expect(AGENT_LIFECYCLE_SRC).toContain('public-review-eligibility-incomplete');
-    expect(AGENT_LIFECYCLE_SRC).toContain('public-review-actions-provider-unsupported');
+    // The provider-unsupported categories moved to `publicReviewProviderBlock`
+    // with the gate decision itself; their exact values are asserted there
+    // (providerVendors.publicReview.test.js).
     expect(AGENT_LIFECYCLE_SRC).toMatch(/if \(scanBlock\) \{[\s\S]*?status: 'blocked'/);
     expect(AGENT_LIFECYCLE_SRC).toMatch(/expected fail-closed safety outcome/);
     const gateStart = AGENT_LIFECYCLE_SRC.indexOf('const scanBlock = publicReviewScanBlock(task)');
-    const gateEnd = AGENT_LIFECYCLE_SRC.indexOf('if (!supportsPublicReviewPosture(provider, publicReviewPosture', gateStart);
+    const gateEnd = AGENT_LIFECYCLE_SRC.indexOf('const postureBlock = publicReviewProviderBlock(provider, publicReviewPosture', gateStart);
     expect(gateEnd).toBeGreaterThan(gateStart);
     expect(AGENT_LIFECYCLE_SRC.slice(gateStart, gateEnd)).not.toContain("cosEvents.emit('agent:error'");
   });
+
+  // #5830 collapsed the two per-stage provider gates into one and dropped the
+  // `publicReview &&` guard with them, so an ORDINARY task — posture `null`,
+  // which no vendor declares a recipe for — was blocked at spawn with
+  // "has no enforced null public-content review mode". The decision now lives
+  // in `publicReviewProviderBlock` (unit-tested in
+  // providerVendors.publicReview.test.js), which returns null for a task that
+  // requested no posture. Pin the call so the caller cannot re-derive it from a
+  // boolean support check and reintroduce the same collapse.
+  it('asks the posture helper for the provider gate rather than re-deriving it', () => {
+    expect(AGENT_LIFECYCLE_SRC).toContain('const postureBlock = publicReviewProviderBlock(provider, publicReviewPosture, { tui: isTui })');
+    expect(AGENT_LIFECYCLE_SRC).toMatch(/if \(postureBlock\) \{[\s\S]*?status: 'blocked'/);
+    // The helper owns the blocked category too, so the gate cannot pick its own.
+    expect(AGENT_LIFECYCLE_SRC).toContain('const { reason, category } = postureBlock;');
+    // The reason text belongs to the helper — building it here means the gate
+    // decided for itself whether the posture was supported.
+    expect(AGENT_LIFECYCLE_SRC).not.toContain('public-content review mode');
+    expect(AGENT_LIFECYCLE_SRC).not.toMatch(/supportsPublicReviewPosture\(/);
+  });
 });
 
 // ─── Coverage guard for the self-update spawn gate (issue #4124) ────────────