diff --git a/config/platform-infra/webterm.yaml b/config/platform-infra/webterm.yaml
index 874b61da..4479a82a 100644
--- a/config/platform-infra/webterm.yaml
+++ b/config/platform-infra/webterm.yaml
@@ -5,6 +5,19 @@ metadata:
   id: webterm-public
   owner: unidesk
 
+sessionStartModes:
+  defaultMode: mycx
+  options:
+    bash:
+      label: Bash
+      command: exec bash -l
+    mycx:
+      label: mycx
+      command: mycx
+    oncx:
+      label: oncx
+      command: oncx
+
 defaults:
   targetId: local-7683
 
@@ -40,7 +53,7 @@ targets:
           command: mycx resume 019f4937-9820-7b31-9178-344ae93d5a4c
           cols: 100
           rows: 30
-        - title: 71-FILTER
+        - title: CONSTAR
           cwd: /root/unidesk
           command: mycx resume 019f4b5f-b5ce-76b3-8ccb-508790e9662d
           cols: 100
diff --git a/scripts/src/platform-infra-webterm.ts b/scripts/src/platform-infra-webterm.ts
index 3893dc7d..3830cdbc 100644
--- a/scripts/src/platform-infra-webterm.ts
+++ b/scripts/src/platform-infra-webterm.ts
@@ -21,9 +21,15 @@ const serviceName = "webterm";
 
 interface WebtermConfig {
   defaults: { targetId: string };
+  sessionStartModes: SessionStartModes;
   targets: WebtermTarget[];
 }
 
+interface SessionStartModes {
+  defaultMode: string;
+  options: Array<{ id: string; label: string; command: string }>;
+}
+
 interface WebtermTarget {
   id: string;
   enabled: boolean;
@@ -42,6 +48,7 @@ interface WebtermTarget {
     pid: "host" | "container";
     sourceMounts: Array<{ source: string; target: string; readOnly: boolean }>;
     autoStartSessions: Array<{ title: string; cwd: string; command: string; cols: number; rows: number }>;
+    sessionStartModes: SessionStartModes;
     environment: Record<string, string>;
   };
   publicExposure: {
@@ -237,15 +244,17 @@ function validate(targetId: string | null): Record<string, unknown> {
 function readWebtermConfig(): WebtermConfig {
   const yaml = readYamlRecord(configPath, "platform-infra-webterm");
   const defaults = recordField(yaml, "defaults", "webterm");
+  const sessionStartModes = parseSessionStartModes(recordField(yaml, "sessionStartModes", "webterm"), "webterm.sessionStartModes");
   const targetsRaw = yaml.targets;
   if (!Array.isArray(targetsRaw)) throw new Error("webterm.targets must be an array");
   return {
     defaults: { targetId: stringField(defaults, "targetId", "webterm.defaults") },
-    targets: targetsRaw.map((item, index) => parseTarget(asRecord(item, `webterm.targets[${index}]`), `webterm.targets[${index}]`)),
+    sessionStartModes,
+    targets: targetsRaw.map((item, index) => parseTarget(asRecord(item, `webterm.targets[${index}]`), `webterm.targets[${index}]`, sessionStartModes)),
   };
 }
 
-function parseTarget(record: Record<string, unknown>, path: string): WebtermTarget {
+function parseTarget(record: Record<string, unknown>, path: string, sessionStartModes: SessionStartModes): WebtermTarget {
   const runtime = recordField(record, "runtime", path);
   const exposure = recordField(record, "publicExposure", path);
   const dns = recordField(exposure, "dns", `${path}.publicExposure`);
@@ -272,6 +281,7 @@ function parseTarget(record: Record<string, unknown>, path: string): WebtermTarg
       pid: parsePid(stringField(runtime, "pid", `${path}.runtime`), `${path}.runtime.pid`),
       sourceMounts,
       autoStartSessions,
+      sessionStartModes,
       environment,
     },
     publicExposure: {
@@ -312,6 +322,8 @@ function renderCompose(target: WebtermTarget): string {
   const environment = {
     ...target.runtime.environment,
     AUTO_START_SESSIONS_JSON: JSON.stringify(target.runtime.autoStartSessions),
+    SESSION_START_MODES_JSON: JSON.stringify(target.runtime.sessionStartModes.options),
+    SESSION_START_DEFAULT_MODE: target.runtime.sessionStartModes.defaultMode,
   };
   const envLines = Object.entries(environment)
     .map(([key, value]) => `      ${key}: ${quoteYaml(value)}`)
@@ -386,6 +398,10 @@ function targetSummary(target: WebtermTarget): Record<string, unknown> {
     containerName: target.runtime.containerName,
     image: target.runtime.image,
     autoStartSessions: target.runtime.autoStartSessions.map((session) => session.title),
+    sessionStartModes: {
+      defaultMode: target.runtime.sessionStartModes.defaultMode,
+      options: target.runtime.sessionStartModes.options.map((mode) => mode.id),
+    },
     sourceMounts: target.runtime.sourceMounts.map((mount) => `${mount.source}->${mount.target}${mount.readOnly ? ":ro" : ""}`),
     hostPort: target.runtime.hostPort,
     containerPort: target.runtime.containerPort,
@@ -504,6 +520,29 @@ function parseAutoStartSessions(value: unknown, path: string): WebtermTarget["ru
   });
 }
 
+function parseSessionStartModes(record: Record<string, unknown>, path: string): SessionStartModes {
+  const defaultMode = stringField(record, "defaultMode", path);
+  const optionsRecord = recordField(record, "options", path);
+  const options = Object.entries(optionsRecord).map(([id, item]) => {
+    const itemPath = `${path}.options.${id}`;
+    const option = asRecord(item, itemPath);
+    return {
+      id,
+      label: stringField(option, "label", itemPath),
+      command: commandField(option, itemPath),
+    };
+  });
+  if (options.length === 0) throw new Error(`${path}.options must be a non-empty record`);
+  if (!options.some((option) => option.id === defaultMode)) throw new Error(`${path}.defaultMode must reference an option id`);
+  return { defaultMode, options };
+}
+
+function commandField(record: Record<string, unknown>, path: string): string {
+  const value = record.command;
+  if (typeof value !== "string") throw new Error(`${path}.command must be a string`);
+  return value.trim();
+}
+
 function parseLiteral<T extends string>(value: string, expected: T, path: string): T {
   if (value !== expected) throw new Error(`${path} must be ${expected}`);
   return expected;