fix(fleet): report idle agents as available

docs/scratchpads/h2-readiness-available.md

@@ -0,0 +1,70 @@
+# H2 — readiness semantics: available, not stuck
+
+## Objective
+
+Correct fleet readiness semantics so a healthy long-idle agent is reported as `available` (good/assignable) instead of `stuck` (fault). Reserve `stuck` in the type/JSON value space for future positive block evidence.
+
+## Scope
+
+- `packages/mosaic/src/commands/fleet.ts`
+  - replace `idle` readiness state with `available`
+  - keep `stuck` in the union but stop emitting it from idle-only heuristics
+  - remove stuck threshold helper/env handling
+  - remove IDLE/STUCK alarm flags from table rendering
+- `packages/mosaic/src/commands/fleet.spec.ts`
+  - update classifier branch/boundary tests
+  - assert very long idle maps to `available`, not `stuck`
+  - update table/JSON assertions for available with no alarm flags
+  - remove stuck threshold helper tests
+
+## Acceptance Criteria
+
+- `classifyReadiness()` remains pure/total/never-throw and maps:
+  - dead/stale/unknown unchanged
+  - busy/null/undefined/non-finite idle to `working`
+  - idle >= activity threshold to `available`
+  - idle < activity threshold to `working`
+- No idle-derived path emits `stuck`.
+- `MOSAIC_HEARTBEAT_IDLE_THRESHOLD` remains backward compatible as the working→available activity threshold.
+- `MOSAIC_HEARTBEAT_STUCK_THRESHOLD` and helper/default are removed.
+- `fleet ps` keeps the idle-seconds column header `IDLE`, renders `available` in HB label, and does not add IDLE/STUCK warning flags.
+- Local gates green: build precheck, typecheck, lint, format:check, fleet vitest.
+- PR opened against `main`; no merge by worker.
+
+## Constraints / Assumptions
+
+- Source branch: `origin/main` @ `1020cfa`.
+- `docs/TASKS.md` is orchestrator-owned; worker will not modify it.
+- Documentation impact is captured in this scratchpad and PR description; no user/admin guide behavior beyond CLI readiness label semantics.
+
+## Plan
+
+1. Install dependencies with requested PNPM environment.
+2. Inspect current H1/H1b readiness implementation and tests.
+3. Update classifier types/helpers/rendering.
+4. Update focused tests.
+5. Run build precheck + required gates.
+6. Run automated code review, remediate any findings.
+7. Queue guard, push, open PR.
+
+## Progress
+
+- 2026-06-24: Branch created from `origin/main` @ `1020cfa`.
+- 2026-06-24: Replaced idle-derived `idle`/`stuck` outputs with `available`; retained `stuck` in type union for future positive block evidence.
+- 2026-06-24: Removed stuck threshold env/helper plumbing and IDLE/STUCK alarm flags.
+- 2026-06-24: Updated classifier and table-render tests for available semantics.
+
+## Verification Evidence
+
+- `pnpm install --store-dir "$HOME/.pnpm-store"` — pass.
+- `npx turbo build --filter=@mosaicstack/mosaic^...` — pass, 12/12 tasks successful.
+- `pnpm typecheck` — pass, 41/41 tasks successful.
+- `pnpm lint` — pass, 23/23 tasks successful.
+- `pnpm format:check` — pass, all matched files use Prettier style.
+- `pnpm --filter @mosaicstack/mosaic exec vitest run src/commands/fleet.spec.ts` — pass, 177 tests.
+- `~/.config/mosaic/tools/codex/codex-code-review.sh --uncommitted` — approve, 0 findings (reviewed supplied diff; sandbox file-inspection limitation noted by tool).
+
+## Risks / Blockers
+
+- No current blocker.
+- Review tool could not inspect repo files directly due sandbox wrapper limitation, but it reviewed the supplied diff and approved with no findings.

packages/mosaic/src/commands/fleet.spec.ts

@@ -27,7 +27,6 @@ import {
   enableFleetUnits,
   FLEET_PROFILES,
   HEARTBEAT_IDLE_THRESHOLD_SECONDS,
-  HEARTBEAT_STUCK_THRESHOLD_SECONDS,
   generateAgentEnv,
   getDefaultOperatorSourceLabel,
   getDefaultTenantAndHost,
@@ -48,7 +47,6 @@ import {
   resolvePresetFilename,
   RUNTIME_ACCEPTABLE_COMMANDS,
   serializeRosterToYaml,
-  stuckThresholdSeconds,
   VERIFY_DEFAULT_TIMEOUT_MS,
   VERIFY_POLL_INTERVAL_MS,
   type AgentPsRow,
@@ -940,42 +938,33 @@ describe('fleet ps — heartbeat parsing', () => {
 
 describe('fleet ps — readiness thresholds', () => {
   const savedIdle = process.env.MOSAIC_HEARTBEAT_IDLE_THRESHOLD;
-  const savedStuck = process.env.MOSAIC_HEARTBEAT_STUCK_THRESHOLD;
 
   afterEach(() => {
     if (savedIdle === undefined) delete process.env.MOSAIC_HEARTBEAT_IDLE_THRESHOLD;
     else process.env.MOSAIC_HEARTBEAT_IDLE_THRESHOLD = savedIdle;
-    if (savedStuck === undefined) delete process.env.MOSAIC_HEARTBEAT_STUCK_THRESHOLD;
-    else process.env.MOSAIC_HEARTBEAT_STUCK_THRESHOLD = savedStuck;
   });
 
-  it('uses default readiness thresholds when env is unset', () => {
+  it('uses the default activity threshold when env is unset', () => {
     delete process.env.MOSAIC_HEARTBEAT_IDLE_THRESHOLD;
-    delete process.env.MOSAIC_HEARTBEAT_STUCK_THRESHOLD;
 
     expect(idleThresholdSeconds()).toBe(HEARTBEAT_IDLE_THRESHOLD_SECONDS);
-    expect(stuckThresholdSeconds()).toBe(HEARTBEAT_STUCK_THRESHOLD_SECONDS);
   });
 
-  it('honors positive integer readiness thresholds from env', () => {
+  it('honors a positive integer activity threshold from env', () => {
     process.env.MOSAIC_HEARTBEAT_IDLE_THRESHOLD = '120';
-    process.env.MOSAIC_HEARTBEAT_STUCK_THRESHOLD = '480';
 
     expect(idleThresholdSeconds()).toBe(120);
-    expect(stuckThresholdSeconds()).toBe(480);
   });
 
-  it('falls back to defaults for invalid readiness thresholds', () => {
+  it('falls back to the default for invalid activity thresholds', () => {
     process.env.MOSAIC_HEARTBEAT_IDLE_THRESHOLD = '0';
-    process.env.MOSAIC_HEARTBEAT_STUCK_THRESHOLD = 'not-a-number';
 
     expect(idleThresholdSeconds()).toBe(HEARTBEAT_IDLE_THRESHOLD_SECONDS);
-    expect(stuckThresholdSeconds()).toBe(HEARTBEAT_STUCK_THRESHOLD_SECONDS);
   });
 });
 
 describe('fleet ps — readiness classification', () => {
-  const thresholds = { idleThresholdSeconds: 300, stuckThresholdSeconds: 900 };
+  const thresholds = { idleThresholdSeconds: 300 };
 
   it('reports dead when the pane is not alive', () => {
     expect(
@@ -1004,7 +993,7 @@ describe('fleet ps — readiness classification', () => {
     ).toBe('stale');
   });
 
-  it('reports working when heartbeat status is busy, even past stuck threshold', () => {
+  it('reports working when heartbeat status is busy, even after the activity threshold', () => {
     expect(
       classifyReadiness(
         { paneAlive: true, hbHealth: 'healthy', hbStatus: 'busy', idleSeconds: 2_000 },
@@ -1013,7 +1002,7 @@ describe('fleet ps — readiness classification', () => {
     ).toBe('working');
   });
 
-  it('reports working when pane idle seconds are unavailable', () => {
+  it('reports working when pane idle seconds are null', () => {
     expect(
       classifyReadiness(
         { paneAlive: true, hbHealth: 'healthy', hbStatus: 'ok', idleSeconds: null },
@@ -1022,25 +1011,31 @@ describe('fleet ps — readiness classification', () => {
     ).toBe('working');
   });
 
-  it('reports stuck at the stuck threshold boundary', () => {
+  it('reports working when pane idle seconds are undefined', () => {
     expect(
-      classifyReadiness(
-        { paneAlive: true, hbHealth: 'healthy', hbStatus: 'ok', idleSeconds: 900 },
-        thresholds,
-      ),
-    ).toBe('stuck');
+      classifyReadiness({ paneAlive: true, hbHealth: 'healthy', hbStatus: 'ok' }, thresholds),
+    ).toBe('working');
   });
 
-  it('reports idle at the idle threshold boundary', () => {
+  it('reports working when pane idle seconds are non-finite', () => {
+    expect(
+      classifyReadiness(
+        { paneAlive: true, hbHealth: 'healthy', hbStatus: 'ok', idleSeconds: Number.NaN },
+        thresholds,
+      ),
+    ).toBe('working');
+  });
+
+  it('reports available at the activity threshold boundary', () => {
     expect(
       classifyReadiness(
         { paneAlive: true, hbHealth: 'healthy', hbStatus: 'ok', idleSeconds: 300 },
         thresholds,
       ),
-    ).toBe('idle');
+    ).toBe('available');
   });
 
-  it('reports working below the idle threshold', () => {
+  it('reports working below the activity threshold', () => {
     expect(
       classifyReadiness(
         { paneAlive: true, hbHealth: 'healthy', hbStatus: 'ok', idleSeconds: 299 },
@@ -1049,13 +1044,14 @@ describe('fleet ps — readiness classification', () => {
     ).toBe('working');
   });
 
-  it('checks stuck before idle when thresholds are inverted', () => {
-    expect(
-      classifyReadiness(
-        { paneAlive: true, hbHealth: 'healthy', hbStatus: 'ok', idleSeconds: 350 },
-        { idleThresholdSeconds: 900, stuckThresholdSeconds: 300 },
-      ),
-    ).toBe('stuck');
+  it('reports very long idle as available, not stuck', () => {
+    const readiness = classifyReadiness(
+      { paneAlive: true, hbHealth: 'healthy', hbStatus: 'ok', idleSeconds: 100_000 },
+      thresholds,
+    );
+
+    expect(readiness).toBe('available');
+    expect(readiness).not.toBe('stuck');
   });
 });
 
@@ -1554,7 +1550,7 @@ describe('fleet ps — command sequences issued', () => {
 });
 
 describe('fleet ps — readiness table output', () => {
-  it('renders readiness in HB column and flags idle/stuck rows', async () => {
+  it('renders available in HB column without idle/stuck alarm flags', async () => {
     const home = await mkdtemp(join(tmpdir(), 'mosaic-fleet-'));
     const rosterPath = join(home, 'fleet', 'roster.yaml');
     const runDir = join(home, 'fleet', 'run');
@@ -1565,36 +1561,34 @@ describe('fleet ps — readiness table output', () => {
         'version: 1',
         'transport: tmux',
         'agents:',
-        '  - name: idle-agent',
+        '  - name: working-agent',
         '    runtime: pi',
-        '  - name: stuck-agent',
+        '  - name: available-agent',
         '    runtime: pi',
       ].join('\n'),
     );
 
     const nowMs = 1_700_000_000_000;
-    const idleActivityEpoch = Math.floor((nowMs - 10_000) / 1000);
-    const stuckActivityEpoch = Math.floor((nowMs - 40_000) / 1000);
+    const workingActivityEpoch = Math.floor((nowMs - 2_000) / 1000);
+    const availableActivityEpoch = Math.floor((nowMs - 40_000) / 1000);
     const hbTs = new Date(nowMs - 1_000).toISOString();
-    await writeFile(join(runDir, 'idle-agent.hb'), `ts=${hbTs}\npid=111\nstatus=ok\n`);
-    await writeFile(join(runDir, 'stuck-agent.hb'), `ts=${hbTs}\npid=222\nstatus=ok\n`);
+    await writeFile(join(runDir, 'working-agent.hb'), `ts=${hbTs}\npid=111\nstatus=ok\n`);
+    await writeFile(join(runDir, 'available-agent.hb'), `ts=${hbTs}\npid=222\nstatus=ok\n`);
 
     const savedIdle = process.env.MOSAIC_HEARTBEAT_IDLE_THRESHOLD;
-    const savedStuck = process.env.MOSAIC_HEARTBEAT_STUCK_THRESHOLD;
     process.env.MOSAIC_HEARTBEAT_IDLE_THRESHOLD = '5';
-    process.env.MOSAIC_HEARTBEAT_STUCK_THRESHOLD = '30';
 
     const dateNow = vi.spyOn(Date, 'now').mockReturnValue(nowMs);
     const runner: CommandRunner = async (command, args) => {
       const full = [command, ...args].join(' ');
       if (full.includes('list-sessions')) {
-        return { stdout: 'idle-agent\nstuck-agent\n', stderr: '', exitCode: 0 };
+        return { stdout: 'working-agent\navailable-agent\n', stderr: '', exitCode: 0 };
       }
-      if (full.includes('=idle-agent:0.0')) {
-        return { stdout: `111 pi 0 ${idleActivityEpoch}\n`, stderr: '', exitCode: 0 };
+      if (full.includes('=working-agent:0.0')) {
+        return { stdout: `111 pi 0 ${workingActivityEpoch}\n`, stderr: '', exitCode: 0 };
       }
-      if (full.includes('=stuck-agent:0.0')) {
-        return { stdout: `222 pi 0 ${stuckActivityEpoch}\n`, stderr: '', exitCode: 0 };
+      if (full.includes('=available-agent:0.0')) {
+        return { stdout: `222 pi 0 ${availableActivityEpoch}\n`, stderr: '', exitCode: 0 };
       }
       if (full.includes('systemctl') && full.includes('show')) {
         return {
@@ -1623,19 +1617,17 @@ describe('fleet ps — readiness table output', () => {
       dateNow.mockRestore();
       if (savedIdle === undefined) delete process.env.MOSAIC_HEARTBEAT_IDLE_THRESHOLD;
       else process.env.MOSAIC_HEARTBEAT_IDLE_THRESHOLD = savedIdle;
-      if (savedStuck === undefined) delete process.env.MOSAIC_HEARTBEAT_STUCK_THRESHOLD;
-      else process.env.MOSAIC_HEARTBEAT_STUCK_THRESHOLD = savedStuck;
       await rm(home, { recursive: true, force: true });
     }
 
-    const idleLine = lines.find((line) => line.includes('idle-agent'));
-    const stuckLine = lines.find((line) => line.includes('stuck-agent'));
-    expect(idleLine).toBeDefined();
-    expect(idleLine).toContain('1s/idle');
-    expect(idleLine).toMatch(/\bIDLE\b/);
-    expect(stuckLine).toBeDefined();
-    expect(stuckLine).toContain('1s/stuck');
-    expect(stuckLine).toMatch(/\bSTUCK\b/);
+    const workingLine = lines.find((line) => line.includes('working-agent'));
+    const availableLine = lines.find((line) => line.includes('available-agent'));
+    expect(workingLine).toBeDefined();
+    expect(workingLine).toContain('1s/working');
+    expect(availableLine).toBeDefined();
+    expect(availableLine).toContain('1s/available');
+    expect(availableLine).not.toMatch(/\bIDLE\b/);
+    expect(availableLine).not.toMatch(/\bSTUCK\b/);
   });
 });
 

packages/mosaic/src/commands/fleet.ts

@@ -395,7 +395,6 @@ export function buildAgentTailCommand(agentName: string, lines: number, socketNa
 
 export const HEARTBEAT_INTERVAL_MS = 15_000;
 export const HEARTBEAT_IDLE_THRESHOLD_SECONDS = 300;
-export const HEARTBEAT_STUCK_THRESHOLD_SECONDS = 900;
 
 /**
  * Heartbeat interval in ms, honoring MOSAIC_HEARTBEAT_INTERVAL (seconds) so the
@@ -407,20 +406,14 @@ export function heartbeatIntervalMs(): number {
   return Number.isFinite(sec) && sec > 0 ? sec * 1000 : HEARTBEAT_INTERVAL_MS;
 }
 
-/** Idle threshold in seconds, honoring MOSAIC_HEARTBEAT_IDLE_THRESHOLD. */
+/** Activity threshold in seconds, honoring MOSAIC_HEARTBEAT_IDLE_THRESHOLD. */
 export function idleThresholdSeconds(): number {
   const sec = Number.parseInt(process.env.MOSAIC_HEARTBEAT_IDLE_THRESHOLD ?? '', 10);
   return Number.isFinite(sec) && sec > 0 ? sec : HEARTBEAT_IDLE_THRESHOLD_SECONDS;
 }
-
-/** Stuck threshold in seconds, honoring MOSAIC_HEARTBEAT_STUCK_THRESHOLD. */
-export function stuckThresholdSeconds(): number {
-  const sec = Number.parseInt(process.env.MOSAIC_HEARTBEAT_STUCK_THRESHOLD ?? '', 10);
-  return Number.isFinite(sec) && sec > 0 ? sec : HEARTBEAT_STUCK_THRESHOLD_SECONDS;
-}
 export const HEARTBEAT_HEALTHY_MULTIPLIER = 3;
 
-export type ReadinessState = 'working' | 'idle' | 'stuck' | 'stale' | 'dead' | 'unknown';
+export type ReadinessState = 'working' | 'available' | 'stuck' | 'stale' | 'dead' | 'unknown';
 
 export interface ReadinessSignals {
   paneAlive: boolean;
@@ -431,7 +424,6 @@ export interface ReadinessSignals {
 
 export interface ReadinessThresholds {
   idleThresholdSeconds: number;
-  stuckThresholdSeconds: number;
 }
 
 /**
@@ -456,12 +448,8 @@ export function classifyReadiness(
     const idleThreshold = Number.isFinite(thresholds?.idleThresholdSeconds)
       ? Number(thresholds?.idleThresholdSeconds)
       : idleThresholdSeconds();
-    const stuckThreshold = Number.isFinite(thresholds?.stuckThresholdSeconds)
-      ? Number(thresholds?.stuckThresholdSeconds)
-      : stuckThresholdSeconds();
-
-    if (idleSeconds >= stuckThreshold) return 'stuck';
-    if (idleSeconds >= idleThreshold) return 'idle';
+    // Follow-up: stuck pending per-agent assignment awareness: assigned task + idle past threshold => stuck.
+    if (idleSeconds >= idleThreshold) return 'available';
     return 'working';
   } catch {
     return 'unknown';
@@ -1089,7 +1077,6 @@ export function registerFleetCommand(program: Command, deps: FleetCommandDeps =
       const rows: AgentPsRow[] = [];
       const readinessThresholds = {
         idleThresholdSeconds: idleThresholdSeconds(),
-        stuckThresholdSeconds: stuckThresholdSeconds(),
       };
 
       // Build the set of roster agent names for quick lookup when filtering socket sessions.
@@ -1264,8 +1251,6 @@ export function registerFleetCommand(program: Command, deps: FleetCommandDeps =
         if (!row.managed) flags.push('UNMANAGED');
         if (row.driftFlag) flags.push('DRIFT');
         if (row.bootEnableWarning) flags.push('BOOT-ENABLE');
-        if (row.readiness === 'idle') flags.push('IDLE');
-        if (row.readiness === 'stuck') flags.push('STUCK');
 
         console.log(
           [