diff --git a/lib/parse-caddy.ts b/lib/parse-caddy.ts
new file mode 100644
index 0000000..5744308
--- /dev/null
+++ b/lib/parse-caddy.ts
@@ -0,0 +1,54 @@
+export interface CertInfo {
+  domain: string
+  subject: string
+  issuer: string
+  issuerCN: string
+  notBefore: string
+  notAfter: string
+  expiringWarning: boolean
+  expired: boolean
+}
+
+export function parseCertList(output: string): CertInfo[] {
+  const certs: CertInfo[] = []
+  const blocks = output.split('CERTEND')
+
+  for (const block of blocks) {
+    const fileMatch = block.match(/CERTFILE:(.+)/)
+    if (!fileMatch) continue
+
+    const filePath = fileMatch[1].trim()
+    const domain = filePath.split('/').filter(Boolean).pop()?.replace(/\.crt$/, '') ?? ''
+
+    let subject = ''
+    let issuer = ''
+    let notBefore = ''
+    let notAfter = ''
+
+    for (const line of block.split('\n')) {
+      const subjectMatch = line.match(/^subject=(.+)/)
+      if (subjectMatch) subject = subjectMatch[1].trim()
+
+      const issuerMatch = line.match(/^issuer=(.+)/)
+      if (issuerMatch) issuer = issuerMatch[1].trim()
+
+      const notBeforeMatch = line.match(/^notBefore=(.+)/)
+      if (notBeforeMatch) notBefore = notBeforeMatch[1].trim()
+
+      const notAfterMatch = line.match(/^notAfter=(.+)/)
+      if (notAfterMatch) notAfter = notAfterMatch[1].trim()
+    }
+
+    const issuerCN = issuer.match(/CN\s*=\s*([^,]+)/)?.[1]?.trim() ?? issuer
+
+    const now = Date.now()
+    const notAfterDate = notAfter ? new Date(notAfter) : null
+    const notAfterMs = notAfterDate?.getTime() ?? Infinity
+    const expiringWarning = notAfterMs - now < 30 * 24 * 60 * 60 * 1000
+    const expired = notAfterMs < now
+
+    certs.push({ domain, subject, issuer, issuerCN, notBefore, notAfter, expiringWarning, expired })
+  }
+
+  return certs
+}
diff --git a/ops-agent/commands.yml.example b/ops-agent/commands.yml.example
index 96e2559..1414578 100644
--- a/ops-agent/commands.yml.example
+++ b/ops-agent/commands.yml.example
@@ -63,3 +63,10 @@ commands:
   caddy_show_config:
     cmd: ["caddy", "fmt", "/etc/caddy/Caddyfile"]
     description: "Print the formatted Caddy config"
+
+  caddy_list_certs:
+    cmd:
+      - sh
+      - -c
+      - "for f in /data/caddy/certificates/*/*.crt; do [ -f \"$f\" ] || continue; echo \"CERTFILE:$f\"; openssl x509 -noout -subject -issuer -dates -in \"$f\" 2>&1; echo \"CERTEND\"; done"
+    description: "List TLS cert info (subject, issuer, validity dates) from Caddy certificate store"
diff --git a/package.json b/package.json
index 268d3c3..a9c9481 100644
--- a/package.json
+++ b/package.json
@@ -27,6 +27,7 @@
     "react": "19.2.4",
     "react-dom": "19.2.4",
     "shadcn": "^4.7.0",
+    "shiki": "^1.29.2",
     "tailwind-merge": "^3.6.0",
     "tw-animate-css": "^1.4.0"
   },