diff --git a/.gitignore b/.gitignore
index f9e7a8c..1ca61a1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 node_modules/
 coverage/
 .DS_Store
+package-lock.json
diff --git a/dist/index.js b/dist/index.js
index f2b88de..60afb9e 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -4,6 +4,9 @@ const VALID_STATES = new Set(['off', 'running', 'warning', 'error']);
 function asString(value) {
     return typeof value === 'string' && value.length > 0 ? value : undefined;
 }
+function asNumber(value) {
+    return typeof value === 'number' && Number.isFinite(value) ? value : undefined;
+}
 function asState(value) {
     return typeof value === 'string' && VALID_STATES.has(value)
         ? value
@@ -18,6 +21,45 @@ function runtimePid() {
     const pid = globalThis.process?.pid;
     return typeof pid === 'number' ? String(pid) : 'unknown';
 }
+function extractPortFromUrl(url) {
+    if (!url)
+        return undefined;
+    try {
+        const parsed = new URL(url);
+        return parsed.port ? parsed.port : undefined;
+    }
+    catch {
+        const match = url.match(/:(\d+)(?:\/|$)/);
+        return match?.[1];
+    }
+}
+function stateLabel(state, locale) {
+    if (locale === 'fr') {
+        if (state === 'running')
+            return 'En cours';
+        if (state === 'warning')
+            return 'Avertissement';
+        return 'Erreur';
+    }
+    if (state === 'running')
+        return 'Running';
+    if (state === 'warning')
+        return 'Warning';
+    return 'Error';
+}
+function relativeAge(updatedAt, now, locale) {
+    const seconds = Math.max(0, Math.round((now - updatedAt) / 1000));
+    if (locale === 'fr') {
+        if (seconds < 60)
+            return `Maj : il y a ${seconds}s`;
+        const minutes = Math.round(seconds / 60);
+        return `Maj : il y a ${minutes}min`;
+    }
+    if (seconds < 60)
+        return `Updated ${seconds}s ago`;
+    const minutes = Math.round(seconds / 60);
+    return `Updated ${minutes}min ago`;
+}
 function parseTrackedStatus(value) {
     const record = asRecord(value);
     if (!record)
@@ -25,11 +67,18 @@ function parseTrackedStatus(value) {
     const state = asState(record.state);
     if (!state)
         return undefined;
+    const updatedAt = asNumber(record.updatedAt);
+    if (updatedAt === undefined)
+        return undefined;
     const errorMessage = asString(record.errorMessage);
+    const command = asString(record.command);
+    const url = asString(record.url) ?? null;
     return {
         state,
-        url: asString(record.url) ?? null,
+        url,
+        updatedAt,
         ...(errorMessage ? { errorMessage } : {}),
+        ...(command ? { command } : {}),
     };
 }
 function loadRuntimeState(context) {
@@ -62,38 +111,81 @@ function loadRuntimeState(context) {
 function persistRuntimeState(context, states) {
     context.storage.set(STORAGE_STATES_KEY, JSON.stringify(Object.fromEntries(states)));
 }
-function toBadgeState(status) {
+function buildTooltip(segments) {
+    return segments.filter((s) => typeof s === 'string' && s.length > 0).join(' · ');
+}
+function toBadgeState(status, now) {
     if (!status || status.state === 'off')
         return { visible: false };
+    const port = extractPortFromUrl(status.url);
+    const value = port;
     if (status.state === 'running') {
-        const suffix = status.url ? ` — ${status.url}` : '';
+        const urlSegment = status.url ?? undefined;
         return {
+            ...(value ? { value } : {}),
             visible: true,
             tone: 'success',
             tooltip: {
-                en: `Dev server running${suffix}`,
-                fr: `Serveur de développement actif${suffix}`,
+                en: buildTooltip([
+                    stateLabel('running', 'en'),
+                    urlSegment,
+                    relativeAge(status.updatedAt, now, 'en'),
+                ]),
+                fr: buildTooltip([
+                    stateLabel('running', 'fr'),
+                    urlSegment,
+                    relativeAge(status.updatedAt, now, 'fr'),
+                ]),
             },
         };
     }
     if (status.state === 'warning') {
-        const suffix = status.errorMessage ? ` — ${status.errorMessage}` : '';
+        const urlSegment = status.url ?? undefined;
+        const errorSegment = status.errorMessage;
         return {
+            ...(value ? { value } : {}),
             visible: true,
             tone: 'warning',
             tooltip: {
-                en: `Dev server warning${suffix}`,
-                fr: `Avertissement serveur de développement${suffix}`,
+                en: buildTooltip([
+                    stateLabel('warning', 'en'),
+                    urlSegment,
+                    errorSegment,
+                    relativeAge(status.updatedAt, now, 'en'),
+                ]),
+                fr: buildTooltip([
+                    stateLabel('warning', 'fr'),
+                    urlSegment,
+                    errorSegment,
+                    relativeAge(status.updatedAt, now, 'fr'),
+                ]),
             },
         };
     }
-    const suffix = status.errorMessage ? ` — ${status.errorMessage}` : '';
+    const urlSegment = status.url ?? undefined;
+    const errorSegment = status.errorMessage;
+    const commandSegment = status.command;
     return {
+        ...(value ? { value } : {}),
         visible: true,
         tone: 'danger',
         tooltip: {
-            en: `Dev server error${suffix}`,
-            fr: `Erreur serveur de développement${suffix}`,
+            en: buildTooltip([
+                stateLabel('error', 'en'),
+                urlSegment,
+                errorSegment,
+                commandSegment,
+                'URL may not be reachable',
+                relativeAge(status.updatedAt, now, 'en'),
+            ]),
+            fr: buildTooltip([
+                stateLabel('error', 'fr'),
+                urlSegment,
+                errorSegment,
+                commandSegment,
+                'URL peut ne pas être joignable',
+                relativeAge(status.updatedAt, now, 'fr'),
+            ]),
         },
     };
 }
@@ -122,7 +214,7 @@ export function register(registry) {
         const workdir = asString(rpcContext.workdir);
         if (!workdir)
             return { visible: false };
-        return toBadgeState(states.get(workdir));
+        return toBadgeState(states.get(workdir), Date.now());
     });
     registry.registerHook('devserver.state.changed', (payload) => {
         const workdir = asString(payload.data.workdir);
@@ -130,9 +222,12 @@ export function register(registry) {
         if (!workdir || !state)
             return;
         const errorMessage = asString(payload.data.errorMessage);
+        const previous = states.get(workdir);
         update(workdir, {
             state,
             url: asString(payload.data.url) ?? null,
+            updatedAt: Date.now(),
+            ...(previous?.command ? { command: previous.command } : {}),
             ...(errorMessage ? { errorMessage } : {}),
         });
     });
@@ -140,9 +235,12 @@ export function register(registry) {
         const workdir = asString(payload.data.workdir);
         if (!workdir)
             return;
+        const command = asString(payload.data.command);
         update(workdir, {
             state: 'running',
             url: asString(payload.data.url) ?? null,
+            updatedAt: Date.now(),
+            ...(command ? { command } : {}),
         });
     });
     registry.registerHook('devserver.stopped', (payload) => {
@@ -150,11 +248,15 @@ export function register(registry) {
         if (!workdir)
             return;
         const reason = asString(payload.data.reason);
+        const previous = states.get(workdir);
+        const command = previous?.command;
         if (reason === 'error') {
             const errorMessage = asString(payload.data.error);
             update(workdir, {
                 state: 'error',
                 url: asString(payload.data.url) ?? null,
+                updatedAt: Date.now(),
+                ...(command ? { command } : {}),
                 ...(errorMessage ? { errorMessage } : {}),
             });
             return;
@@ -162,6 +264,8 @@ export function register(registry) {
         update(workdir, {
             state: 'off',
             url: asString(payload.data.url) ?? null,
+            updatedAt: Date.now(),
+            ...(command ? { command } : {}),
         });
     });
 }
diff --git a/dist/index.js.map b/dist/index.js.map
index 4e990ec..28fd360 100644
--- a/dist/index.js.map
+++ b/dist/index.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/src/index.ts b/src/index.ts
index d6a82c1..d808df9 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -10,6 +10,8 @@ interface TrackedStatus {
   state: DevServerState
   url?: string | null
   errorMessage?: string
+  command?: string
+  updatedAt: number
 }
 
 const STORAGE_PID_KEY = 'runtimePid'
@@ -20,6 +22,10 @@ function asString(value: unknown): string | undefined {
   return typeof value === 'string' && value.length > 0 ? value : undefined
 }
 
+function asNumber(value: unknown): number | undefined {
+  return typeof value === 'number' && Number.isFinite(value) ? value : undefined
+}
+
 function asState(value: unknown): DevServerState | undefined {
   return typeof value === 'string' && VALID_STATES.has(value as DevServerState)
     ? (value as DevServerState)
@@ -37,6 +43,43 @@ function runtimePid(): string {
   return typeof pid === 'number' ? String(pid) : 'unknown'
 }
 
+function extractPortFromUrl(url: string | null | undefined): string | undefined {
+  if (!url) return undefined
+  try {
+    const parsed = new URL(url)
+    return parsed.port ? parsed.port : undefined
+  } catch {
+    const match = url.match(/:(\d+)(?:\/|$)/)
+    return match?.[1]
+  }
+}
+
+function stateLabel(
+  state: DevServerState,
+  locale: 'en' | 'fr',
+): string {
+  if (locale === 'fr') {
+    if (state === 'running') return 'En cours'
+    if (state === 'warning') return 'Avertissement'
+    return 'Erreur'
+  }
+  if (state === 'running') return 'Running'
+  if (state === 'warning') return 'Warning'
+  return 'Error'
+}
+
+function relativeAge(updatedAt: number, now: number, locale: 'en' | 'fr'): string {
+  const seconds = Math.max(0, Math.round((now - updatedAt) / 1000))
+  if (locale === 'fr') {
+    if (seconds < 60) return `Maj : il y a ${seconds}s`
+    const minutes = Math.round(seconds / 60)
+    return `Maj : il y a ${minutes}min`
+  }
+  if (seconds < 60) return `Updated ${seconds}s ago`
+  const minutes = Math.round(seconds / 60)
+  return `Updated ${minutes}min ago`
+}
+
 function parseTrackedStatus(value: unknown): TrackedStatus | undefined {
   const record = asRecord(value)
   if (!record) return undefined
@@ -44,11 +87,19 @@ function parseTrackedStatus(value: unknown): TrackedStatus | undefined {
   const state = asState(record.state)
   if (!state) return undefined
 
+  const updatedAt = asNumber(record.updatedAt)
+  if (updatedAt === undefined) return undefined
+
   const errorMessage = asString(record.errorMessage)
+  const command = asString(record.command)
+  const url = asString(record.url) ?? null
+
   return {
     state,
-    url: asString(record.url) ?? null,
+    url,
+    updatedAt,
     ...(errorMessage ? { errorMessage } : {}),
+    ...(command ? { command } : {}),
   }
 }
 
@@ -84,40 +135,88 @@ function persistRuntimeState(context: PluginContext, states: Map<string, Tracked
   context.storage.set(STORAGE_STATES_KEY, JSON.stringify(Object.fromEntries(states)))
 }
 
-function toBadgeState(status: TrackedStatus | undefined): PluginUiBadgeDynamicState {
+function buildTooltip(segments: (string | undefined)[]): string {
+  return segments.filter((s): s is string => typeof s === 'string' && s.length > 0).join(' · ')
+}
+
+function toBadgeState(
+  status: TrackedStatus | undefined,
+  now: number,
+): PluginUiBadgeDynamicState {
   if (!status || status.state === 'off') return { visible: false }
 
+  const port = extractPortFromUrl(status.url)
+  const value = port
+
   if (status.state === 'running') {
-    const suffix = status.url ? ` — ${status.url}` : ''
+    const urlSegment = status.url ?? undefined
     return {
+      ...(value ? { value } : {}),
       visible: true,
       tone: 'success',
       tooltip: {
-        en: `Dev server running${suffix}`,
-        fr: `Serveur de développement actif${suffix}`,
+        en: buildTooltip([
+          stateLabel('running', 'en'),
+          urlSegment,
+          relativeAge(status.updatedAt, now, 'en'),
+        ]),
+        fr: buildTooltip([
+          stateLabel('running', 'fr'),
+          urlSegment,
+          relativeAge(status.updatedAt, now, 'fr'),
+        ]),
       },
     }
   }
 
   if (status.state === 'warning') {
-    const suffix = status.errorMessage ? ` — ${status.errorMessage}` : ''
+    const urlSegment = status.url ?? undefined
+    const errorSegment = status.errorMessage
     return {
+      ...(value ? { value } : {}),
       visible: true,
       tone: 'warning',
       tooltip: {
-        en: `Dev server warning${suffix}`,
-        fr: `Avertissement serveur de développement${suffix}`,
+        en: buildTooltip([
+          stateLabel('warning', 'en'),
+          urlSegment,
+          errorSegment,
+          relativeAge(status.updatedAt, now, 'en'),
+        ]),
+        fr: buildTooltip([
+          stateLabel('warning', 'fr'),
+          urlSegment,
+          errorSegment,
+          relativeAge(status.updatedAt, now, 'fr'),
+        ]),
       },
     }
   }
 
-  const suffix = status.errorMessage ? ` — ${status.errorMessage}` : ''
+  const urlSegment = status.url ?? undefined
+  const errorSegment = status.errorMessage
+  const commandSegment = status.command
   return {
+    ...(value ? { value } : {}),
     visible: true,
     tone: 'danger',
     tooltip: {
-      en: `Dev server error${suffix}`,
-      fr: `Erreur serveur de développement${suffix}`,
+      en: buildTooltip([
+        stateLabel('error', 'en'),
+        urlSegment,
+        errorSegment,
+        commandSegment,
+        'URL may not be reachable',
+        relativeAge(status.updatedAt, now, 'en'),
+      ]),
+      fr: buildTooltip([
+        stateLabel('error', 'fr'),
+        urlSegment,
+        errorSegment,
+        commandSegment,
+        'URL peut ne pas être joignable',
+        relativeAge(status.updatedAt, now, 'fr'),
+      ]),
     },
   }
 }
@@ -149,7 +248,7 @@ export function register(registry: PluginRegistry): void {
   registry.registerRpc('status', async (_params, rpcContext) => {
     const workdir = asString(rpcContext.workdir)
     if (!workdir) return { visible: false }
-    return toBadgeState(states.get(workdir))
+    return toBadgeState(states.get(workdir), Date.now())
   })
 
   registry.registerHook('devserver.state.changed', (payload) => {
@@ -158,9 +257,12 @@ export function register(registry: PluginRegistry): void {
     if (!workdir || !state) return
 
     const errorMessage = asString(payload.data.errorMessage)
+    const previous = states.get(workdir)
     update(workdir, {
       state,
       url: asString(payload.data.url) ?? null,
+      updatedAt: Date.now(),
+      ...(previous?.command ? { command: previous.command } : {}),
       ...(errorMessage ? { errorMessage } : {}),
     })
   })
@@ -169,9 +271,12 @@ export function register(registry: PluginRegistry): void {
     const workdir = asString(payload.data.workdir)
     if (!workdir) return
 
+    const command = asString(payload.data.command)
     update(workdir, {
       state: 'running',
       url: asString(payload.data.url) ?? null,
+      updatedAt: Date.now(),
+      ...(command ? { command } : {}),
     })
   })
 
@@ -180,11 +285,16 @@ export function register(registry: PluginRegistry): void {
     if (!workdir) return
 
     const reason = asString(payload.data.reason)
+    const previous = states.get(workdir)
+    const command = previous?.command
+
     if (reason === 'error') {
       const errorMessage = asString(payload.data.error)
       update(workdir, {
         state: 'error',
         url: asString(payload.data.url) ?? null,
+        updatedAt: Date.now(),
+        ...(command ? { command } : {}),
         ...(errorMessage ? { errorMessage } : {}),
       })
       return
@@ -193,6 +303,8 @@ export function register(registry: PluginRegistry): void {
     update(workdir, {
       state: 'off',
       url: asString(payload.data.url) ?? null,
+      updatedAt: Date.now(),
+      ...(command ? { command } : {}),
     })
   })
 }
diff --git a/test/index.test.ts b/test/index.test.ts
index a498902..eb09d5e 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -184,4 +184,154 @@ describe('openfox-devserver-status', () => {
     assert.equal(result.tone, 'danger')
     assert.match(result.tooltip.en, /spawn failed/)
   })
+
+  it('packs tooltip as a single dot-separated line including state, URL and relative age (CA-1, CA-4)', async () => {
+    const { registry, calls } = createRegistry()
+    register(registry)
+
+    await handler(calls, 'hook:devserver.started')({
+      data: {
+        workdir: '/tmp/a',
+        url: 'http://localhost:4173',
+        command: 'vite',
+      },
+    })
+
+    const status = handler(calls, 'rpc:status')
+    const result = await status({}, { workdir: '/tmp/a' }) as {
+      visible: boolean
+      tone: string
+      tooltip: { en: string; fr: string }
+    }
+    assert.equal(result.visible, true)
+    assert.equal(result.tone, 'success')
+    assert.ok(!result.tooltip.en.includes('\n'), 'English tooltip must be single-line')
+    assert.ok(!result.tooltip.fr.includes('\n'), 'French tooltip must be single-line')
+    assert.match(result.tooltip.en, /Running · http:\/\/localhost:4173 · Updated \d+s ago/)
+    assert.match(result.tooltip.fr, /En cours · http:\/\/localhost:4173 · Maj : il y a \d+s/)
+  })
+
+  it('refreshes the relative age on each RPC call without re-emitting a hook (CA-4)', async () => {
+    const { registry, calls } = createRegistry()
+    register(registry)
+
+    const startedAt = Date.now()
+    await handler(calls, 'hook:devserver.started')({
+      data: { workdir: '/tmp/a', url: 'http://localhost:4173' },
+    })
+
+    const status = handler(calls, 'rpc:status')
+
+    const first = await status({}, { workdir: '/tmp/a' }) as {
+      tooltip: { fr: string }
+    }
+    assert.match(first.tooltip.fr, /Maj : il y a 0s/)
+
+    await new Promise((resolve) => setTimeout(resolve, 1100))
+
+    const second = await status({}, { workdir: '/tmp/a' }) as {
+      tooltip: { fr: string }
+    }
+    const ageMatch = second.tooltip.fr.match(/Maj : il y a (\d+)s/)
+    assert.ok(ageMatch, 'should still include a relative age segment')
+    assert.ok(Number(ageMatch![1]) >= 1, `expected at least 1s elapsed, got ${ageMatch![1]}`)
+    void startedAt
+  })
+
+  it('surfaces the configured port as the badge value when running (CA-3)', async () => {
+    const { registry, calls } = createRegistry()
+    register(registry)
+
+    await handler(calls, 'hook:devserver.started')({
+      data: { workdir: '/tmp/a', url: 'http://localhost:5173' },
+    })
+
+    const result = await handler(calls, 'rpc:status')({}, { workdir: '/tmp/a' }) as {
+      visible: boolean
+      value?: string | number
+    }
+    assert.equal(result.visible, true)
+    assert.equal(result.value, '5173')
+  })
+
+  it('omits the badge value when the URL has no explicit port (CA-3)', async () => {
+    const { registry, calls } = createRegistry()
+    register(registry)
+
+    await handler(calls, 'hook:devserver.started')({
+      data: { workdir: '/tmp/a', url: 'http://localhost/' },
+    })
+
+    const result = await handler(calls, 'rpc:status')({}, { workdir: '/tmp/a' }) as {
+      visible: boolean
+      value?: string | number
+    }
+    assert.equal(result.visible, true)
+    assert.equal(result.value, undefined)
+  })
+
+  it('flags the URL as potentially unreachable on error and exposes the last command (CA-2, CA-5)', async () => {
+    const { registry, calls } = createRegistry()
+    register(registry)
+
+    await handler(calls, 'hook:devserver.started')({
+      data: {
+        workdir: '/tmp/a',
+        url: 'http://localhost:8000',
+        command: 'uvicorn app:app --port 8000',
+      },
+    })
+
+    await handler(calls, 'hook:devserver.stopped')({
+      data: {
+        workdir: '/tmp/a',
+        reason: 'error',
+        url: 'http://localhost:8000',
+        error: 'spawn failed',
+      },
+    })
+
+    const result = await handler(calls, 'rpc:status')({}, { workdir: '/tmp/a' }) as {
+      visible: boolean
+      tone: string
+      tooltip: { en: string; fr: string }
+    }
+    assert.equal(result.visible, true)
+    assert.equal(result.tone, 'danger')
+    assert.match(result.tooltip.en, /URL may not be reachable/)
+    assert.match(result.tooltip.fr, /URL peut ne pas être joignable/)
+    assert.match(result.tooltip.en, /uvicorn app:app --port 8000/)
+    assert.match(result.tooltip.en, /spawn failed/)
+  })
+
+  it('localizes the age segment in the French error tooltip (regression for CA-1/CA-2)', async () => {
+    const { registry, calls } = createRegistry()
+    register(registry)
+
+    await handler(calls, 'hook:devserver.started')({
+      data: {
+        workdir: '/tmp/a',
+        url: 'http://localhost:8000',
+        command: 'uvicorn app:app --port 8000',
+      },
+    })
+
+    await handler(calls, 'hook:devserver.stopped')({
+      data: {
+        workdir: '/tmp/a',
+        reason: 'error',
+        url: 'http://localhost:8000',
+        error: 'spawn failed',
+      },
+    })
+
+    await new Promise((resolve) => setTimeout(resolve, 1100))
+
+    const result = await handler(calls, 'rpc:status')({}, { workdir: '/tmp/a' }) as {
+      tooltip: { en: string; fr: string }
+    }
+    assert.match(result.tooltip.fr, /Maj : il y a \d+s/)
+    assert.doesNotMatch(result.tooltip.fr, /Updated/)
+    assert.match(result.tooltip.en, /Updated \d+s ago/)
+  })
 })