feat(proxy): add adaptive local port selection for OpenAI-compatible profiles

docs/codebase-summary.md

@@ -92,6 +92,20 @@ src/
 │   ├── unified-config-loader.ts  # Central config loader (546 lines)
 │   └── migration-manager.ts  # Config migration logic
 │
+├── proxy/                    # OpenAI-compatible proxy runtime
+│   ├── index.ts              # Barrel export
+│   ├── proxy-daemon-entry.ts # Daemon entrypoint
+│   ├── proxy-daemon.ts       # Lifecycle, health, and port binding
+│   ├── proxy-port-resolver.ts # Adaptive per-profile port selection
+│   ├── request-router.ts     # Request-time profile/model routing
+│   ├── profile-router.ts     # Profile resolution helpers
+│   ├── proxy-env.ts          # Local runtime env construction
+│   ├── routing-config.ts     # Proxy routing config parsing
+│   ├── upstream-url.ts       # Upstream endpoint resolution
+│   ├── proxy-daemon-state.ts # Persistent running-state metadata
+│   ├── server/               # HTTP server and routes
+│   └── transformers/         # Request and SSE translation
+│
 ├── channels/                 # Official Claude channel integration
 │   ├── official-channels-runtime.ts  # Runtime gating, plugin specs, setup guidance
 │   └── official-channels-store.ts    # Claude channel token/env storage helpers
@@ -216,6 +230,7 @@ src/
 | Targets | `bin/`, `targets/` | Multi-CLI adapter pattern (Claude Code, Factory Droid, Codex CLI, extensible) |
 | Auth | `auth/`, `cliproxy/auth/` | Authentication across providers |
 | Config | `config/`, `types/` | Configuration & type definitions |
+| OpenAI Proxy | `proxy/` | Adaptive local OpenAI-compatible proxy runtime, profile routing, and SSE transforms |
 | Providers | `cliproxy/`, `copilot/`, `glmt/` | Provider integrations plus retained legacy transformer internals |
 | Quota | `cliproxy/quota-*.ts`, `account-manager.ts` | Hybrid quota management (v7.14) |
 | Remote Proxy | `cliproxy/remote-*.ts`, `proxy-config-resolver.ts` | Remote CLIProxy support (v7.1) |

docs/openai-compatible-providers.md

@@ -32,7 +32,7 @@ When to use CCS:
 
 When you launch a compatible settings profile with the Claude target, CCS now:
 
-1. Starts a local proxy on `127.0.0.1`
+1. Starts a local proxy on `127.0.0.1` using the resolved local port for that profile
 2. Accepts Anthropic `/v1/messages` traffic from Claude Code
 3. Translates requests into OpenAI chat-completions format
 4. Forwards them to your configured upstream provider
@@ -72,12 +72,18 @@ Useful variants:
 
 ```bash
 ccs proxy start hf --host 127.0.0.1
+ccs proxy start hf --port 3460
 ccs proxy activate hf
 ccs proxy activate --fish
 ccs proxy status hf
 ccs proxy stop hf
 ```
 
+By default, CCS picks a deterministic local port for each compatible profile
+and adapts automatically when that port is unavailable. Use `--port` for a
+one-off pinned port, or set `proxy.profile_ports` in config when you want a
+stable reserved port per profile.
+
 `ccs proxy activate` now prints the full local runtime contract:
 
 - `ANTHROPIC_BASE_URL`
@@ -98,14 +104,15 @@ runtime as a singleton.
   running
 - When multiple proxies are running, pass the profile explicitly to
   `activate`, `status`, or `stop`
+- `status` and `activate` always reflect the actual running port instead of an
+  assumed default
 
-If you want deterministic ports, configure them in `~/.ccs/config.yaml`:
+If you want to pin ports explicitly, configure them in `~/.ccs/config.yaml`:
 
 ```yaml
 proxy:
-  port: 3456
   profile_ports:
-    hf: 3456
+    hf: 3460
     openai: 3461
 ```
 
@@ -301,10 +308,12 @@ That flag is respected by both:
 - Add `CCS_OPENAI_PROXY_INSECURE=1` to the profile settings
 - Restart the proxy after changing the setting
 
-### Port conflict on `3456`
+### Need to pin or verify the local port
 
-- Start with a fixed port: `ccs proxy start hf --port 3457`
+- Check the active binding with `ccs proxy status hf`
-- Re-run `ccs proxy activate` after changing the port
+- Pin a one-off port with `ccs proxy start hf --port 3460`
+- Reserve a stable profile port with `proxy.profile_ports`
+- Re-run `ccs proxy activate hf` after changing the port
 
 ### Provider returns `429` or empty upstream output
 

src/commands/proxy-command.ts

@@ -64,7 +64,7 @@ function showHelp(): number {
   console.log('  activate [profile] Print shell exports for the running proxy');
   console.log('');
   console.log('Options:');
-  console.log('  --port <n>        Override the local proxy port (default: 3456)');
+  console.log('  --port <n>        Pin an exact local proxy port (default: adaptive)');
   console.log('  --host <addr>     Bind the proxy server to a specific host (default: 127.0.0.1)');
   console.log('  --shell <name>    activate only: auto|bash|zsh|fish|powershell');
   console.log('  --fish            activate only: shorthand for --shell fish');
@@ -104,7 +104,19 @@ async function handleStart(args: string[]): Promise<number> {
 
   const portValue = parseOptionValue(args, '--port');
   const host = parseOptionValue(args, '--host');
-  const port = portValue ? Number.parseInt(portValue, 10) || 3456 : undefined;
+  const parsedPort = portValue ? Number(portValue) : undefined;
+  if (
+    portValue &&
+    (parsedPort === undefined ||
+      !/^\d+$/.test(portValue) ||
+      !Number.isInteger(parsedPort) ||
+      parsedPort < 1 ||
+      parsedPort > 65535)
+  ) {
+    console.error(fail(`Invalid port: ${portValue}`));
+    return 1;
+  }
+  const port = parsedPort;
   let profile;
   try {
     profile = resolveProfile(profileName);

src/config/unified-config-types.ts

@@ -999,7 +999,6 @@ export const DEFAULT_CLIPROXY_SERVER_CONFIG: CliproxyServerConfig = {
 };
 
 export const DEFAULT_OPENAI_COMPAT_PROXY_CONFIG: OpenAICompatProxyConfig = {
-  port: 3456,
   profile_ports: {},
   routing: {
     longContextThreshold: 60_000,

src/proxy/proxy-daemon-entry.ts

@@ -1,5 +1,6 @@
 import { loadSettings } from '../utils/config-manager';
 import { resolveOpenAICompatProfileConfig } from './profile-router';
+import { OPENAI_COMPAT_PROXY_DEFAULT_PORT } from './proxy-daemon-paths';
 import { startOpenAICompatProxyServer } from './server/proxy-server';
 
 interface RuntimeOptions {
@@ -12,7 +13,7 @@ interface RuntimeOptions {
 }
 
 function parseArgs(argv: string[]): RuntimeOptions {
-  let port = 3456;
+  let port = OPENAI_COMPAT_PROXY_DEFAULT_PORT;
   let host = '127.0.0.1';
   let profileName = '';
   let settingsPath = '';

src/proxy/proxy-daemon-paths.ts

@@ -1,7 +1,10 @@
 import * as path from 'path';
 import { getCcsDir } from '../utils/config-manager';
 
-export const OPENAI_COMPAT_PROXY_DEFAULT_PORT = 3456;
+export const OPENAI_COMPAT_PROXY_LEGACY_DEFAULT_PORT = 3456;
+export const OPENAI_COMPAT_PROXY_ADAPTIVE_PORT_START = 43_456;
+export const OPENAI_COMPAT_PROXY_ADAPTIVE_PORT_END = 43_555;
+export const OPENAI_COMPAT_PROXY_DEFAULT_PORT = OPENAI_COMPAT_PROXY_ADAPTIVE_PORT_START;
 export const OPENAI_COMPAT_PROXY_SERVICE_NAME = 'ccs-openai-compat-proxy';
 
 export function getOpenAICompatProxyDir(): string {

src/proxy/proxy-daemon.ts

@@ -6,7 +6,9 @@ import * as lockfile from 'proper-lockfile';
 import { verifyProcessOwnership } from '../cursor/daemon-process-ownership';
 import type { OpenAICompatProfileConfig } from './profile-router';
 import {
-  OPENAI_COMPAT_PROXY_DEFAULT_PORT,
+  OPENAI_COMPAT_PROXY_ADAPTIVE_PORT_END,
+  OPENAI_COMPAT_PROXY_ADAPTIVE_PORT_START,
+  OPENAI_COMPAT_PROXY_LEGACY_DEFAULT_PORT,
   OPENAI_COMPAT_PROXY_SERVICE_NAME,
   getOpenAICompatProxyDir,
 } from './proxy-daemon-paths';
@@ -25,7 +27,10 @@ import {
   writeOpenAICompatProxyPid,
   writeOpenAICompatProxySession,
 } from './proxy-daemon-state';
-import { resolveOpenAICompatProxyPortPreference } from './proxy-port-resolver';
+import {
+  listOpenAICompatProxyCandidatePorts as listFlexibleOpenAICompatProxyCandidatePorts,
+  resolveOpenAICompatProxyPortPreference,
+} from './proxy-port-resolver';
 
 export interface OpenAICompatProxyStatus extends Partial<OpenAICompatProxySession> {
   running: boolean;
@@ -131,6 +136,7 @@ async function terminateDaemonProcess(pid?: number): Promise<void> {
 }
 
 function listOpenAICompatProxyCandidatePorts(
+  profileName: string,
   preferredPort: number,
   exact: boolean,
   excludedPorts: ReadonlySet<number> = new Set()
@@ -139,22 +145,7 @@ function listOpenAICompatProxyCandidatePorts(
     return excludedPorts.has(preferredPort) ? [] : [preferredPort];
   }
 
-  const candidates = new Set<number>();
+  return listFlexibleOpenAICompatProxyCandidatePorts(profileName, preferredPort, excludedPorts);
-  if (!excludedPorts.has(preferredPort)) {
-    candidates.add(preferredPort);
-  }
-
-  for (
-    let candidate = OPENAI_COMPAT_PROXY_DEFAULT_PORT;
-    candidate <= OPENAI_COMPAT_PROXY_DEFAULT_PORT + 10;
-    candidate += 1
-  ) {
-    if (!excludedPorts.has(candidate)) {
-      candidates.add(candidate);
-    }
-  }
-
-  return [...candidates];
 }
 
 function isPortBindConflictMessage(message?: string): boolean {
@@ -494,11 +485,15 @@ export async function startOpenAICompatProxy(
     const host = options.host?.trim() || status.host || '127.0.0.1';
     const portPreference = resolveOpenAICompatProxyPortPreference(profile.profileName);
     const explicitPort = typeof options.port === 'number' ? options.port : undefined;
-    const preferredPort =
+    const rawPreferredPort =
       explicitPort ??
       (portPreference.source === 'profile'
         ? portPreference.port
-        : status.port || portPreference.port);
+        : portPreference.source === 'adaptive' &&
+            status.port === OPENAI_COMPAT_PROXY_LEGACY_DEFAULT_PORT
+          ? portPreference.port
+          : status.port || portPreference.port);
+    const preferredPort = rawPreferredPort;
     const requiresExactPort = explicitPort !== undefined || portPreference.source === 'profile';
     if (status.running && status.port === preferredPort && (status.host || '127.0.0.1') === host) {
       return {
@@ -670,6 +665,7 @@ export async function startOpenAICompatProxy(
       const attemptedPorts = new Set<number>();
       let lastResult: OpenAICompatProxyLaunchResult | null = null;
       const candidates = listOpenAICompatProxyCandidatePorts(
+        profile.profileName,
         preferredPort,
         requiresExactPort,
         attemptedPorts
@@ -678,7 +674,7 @@ export async function startOpenAICompatProxy(
         return {
           success: false,
           port: preferredPort,
-          error: `No free proxy port found in range ${OPENAI_COMPAT_PROXY_DEFAULT_PORT}-${OPENAI_COMPAT_PROXY_DEFAULT_PORT + 10}`,
+          error: `No free proxy port found in adaptive range ${OPENAI_COMPAT_PROXY_ADAPTIVE_PORT_START}-${OPENAI_COMPAT_PROXY_ADAPTIVE_PORT_END}`,
         };
       }
 
@@ -707,7 +703,7 @@ export async function startOpenAICompatProxy(
           port: preferredPort,
           error: requiresExactPort
             ? `Requested proxy port ${preferredPort} is already in use`
-            : 'No free proxy port found in the proxy port range',
+            : 'No free proxy port found in the adaptive proxy port range',
         }
       );
     };

src/proxy/proxy-port-resolver.ts

@@ -1,9 +1,54 @@
 import { loadOrCreateUnifiedConfig } from '../config/unified-config-loader';
-import { OPENAI_COMPAT_PROXY_DEFAULT_PORT } from './proxy-daemon-paths';
+import {
+  OPENAI_COMPAT_PROXY_ADAPTIVE_PORT_END,
+  OPENAI_COMPAT_PROXY_ADAPTIVE_PORT_START,
+} from './proxy-daemon-paths';
 
 export interface OpenAICompatProxyPortPreference {
   port: number;
-  source: 'default' | 'profile';
+  source: 'adaptive' | 'profile' | 'shared';
+}
+
+const ADAPTIVE_PORT_RANGE_SIZE =
+  OPENAI_COMPAT_PROXY_ADAPTIVE_PORT_END - OPENAI_COMPAT_PROXY_ADAPTIVE_PORT_START + 1;
+
+function hashProfileName(profileName: string): number {
+  let hash = 0;
+  for (const char of profileName.trim()) {
+    hash = (hash * 31 + char.charCodeAt(0)) >>> 0;
+  }
+  return hash;
+}
+
+export function resolveOpenAICompatProxyAdaptivePort(profileName: string): number {
+  return (
+    OPENAI_COMPAT_PROXY_ADAPTIVE_PORT_START +
+    (hashProfileName(profileName) % ADAPTIVE_PORT_RANGE_SIZE)
+  );
+}
+
+export function listOpenAICompatProxyCandidatePorts(
+  profileName: string,
+  preferredPort: number,
+  excludedPorts: ReadonlySet<number> = new Set()
+): number[] {
+  const candidates = new Set<number>();
+  if (!excludedPorts.has(preferredPort)) {
+    candidates.add(preferredPort);
+  }
+
+  const adaptiveStart = resolveOpenAICompatProxyAdaptivePort(profileName);
+  for (let offset = 0; offset < ADAPTIVE_PORT_RANGE_SIZE; offset += 1) {
+    const candidate =
+      OPENAI_COMPAT_PROXY_ADAPTIVE_PORT_START +
+      ((adaptiveStart - OPENAI_COMPAT_PROXY_ADAPTIVE_PORT_START + offset) %
+        ADAPTIVE_PORT_RANGE_SIZE);
+    if (!excludedPorts.has(candidate)) {
+      candidates.add(candidate);
+    }
+  }
+
+  return [...candidates];
 }
 
 export function resolveOpenAICompatProxyPortPreference(
@@ -14,9 +59,13 @@ export function resolveOpenAICompatProxyPortPreference(
   if (typeof profilePort === 'number') {
     return { port: profilePort, source: 'profile' };
   }
+  const sharedPort = config.proxy?.port;
+  if (typeof sharedPort === 'number') {
+    return { port: sharedPort, source: 'shared' };
+  }
   return {
-    port: config.proxy?.port ?? OPENAI_COMPAT_PROXY_DEFAULT_PORT,
+    port: resolveOpenAICompatProxyAdaptivePort(profileName),
-    source: 'default',
+    source: 'adaptive',
   };
 }
 

tests/e2e/proxy-command.e2e.test.ts

@@ -21,6 +21,27 @@ function runCli(args: string[], extraEnv: Record<string, string> = {}) {
   });
 }
 
+function writeJson(filePath: string, data: unknown) {
+  fs.writeFileSync(filePath, JSON.stringify(data, null, 2), 'utf8');
+}
+
+function createProfileConfig(profiles: Record<string, Record<string, string>>) {
+  const ccsDir = path.join(tempDir, '.ccs');
+  fs.mkdirSync(ccsDir, { recursive: true });
+  const configProfiles = Object.fromEntries(
+    Object.keys(profiles).map((name) => [name, path.join(ccsDir, `${name}.settings.json`)])
+  );
+  writeJson(path.join(ccsDir, 'config.json'), { profiles: configProfiles });
+  for (const [name, env] of Object.entries(profiles)) {
+    writeJson(configProfiles[name], { env });
+  }
+}
+
+function getRunningPort(statusOutput: string) {
+  const match = statusOutput.match(/Local URL: http:\/\/127\.0\.0\.1:(\d+)/);
+  expect(match).not.toBeNull();
+  return Number(match?.[1]);
+}
 beforeAll(() => {
   if (process.env.CCS_E2E_SKIP_BUILD === '1') {
     expect(fs.existsSync(DIST_ENTRY)).toBe(true);
@@ -54,6 +75,8 @@ describe('proxy command e2e', () => {
     expect(help.status).toBe(0);
     expect(help.stdout).toContain('Usage: ccs proxy <start|stop|status|activate> [profile] [options]');
     expect(help.stdout).toContain('stop [profile]    Stop the running proxy (or all proxies when omitted)');
+    expect(help.stdout).toContain('Pin an exact local proxy port');
+    expect(help.stdout).not.toContain('default: 3456');
   });
 
   it('shows the last-known proxy state when no proxy is currently running', async () => {
@@ -84,45 +107,29 @@ describe('proxy command e2e', () => {
     expect(status.stdout).toContain('Profile: stale');
   });
 
-  it('starts, reports status, activates, and stops via the built CLI', async () => {
+  it('surfaces the actual adaptive port in status and activation output', async () => {
-    const port = await getPort();
+    createProfileConfig({
-    const ccsDir = path.join(tempDir, '.ccs');
+      hf: {
-    fs.mkdirSync(ccsDir, { recursive: true });
+        ANTHROPIC_BASE_URL: 'http://127.0.0.1:11434',
-    const settingsPath = path.join(ccsDir, 'hf.settings.json');
+        ANTHROPIC_AUTH_TOKEN: 'ollama',
-    fs.writeFileSync(
+        ANTHROPIC_MODEL: 'qwen3-coder',
-      path.join(ccsDir, 'config.json'),
+        CCS_DROID_PROVIDER: 'generic-chat-completion-api',
-      JSON.stringify({ profiles: { hf: settingsPath } }, null, 2),
+      },
-      'utf8'
+    });
-    );
+    expect(runCli(['proxy', 'start', 'hf', '--host', '127.0.0.1']).status).toBe(0);
-    fs.writeFileSync(
+    const status = runCli(['proxy', 'status', 'hf']);
-      settingsPath,
+    expect(status.status).toBe(0);
-      JSON.stringify({
+    const port = getRunningPort(status.stdout);
-        env: {
-          ANTHROPIC_BASE_URL: 'http://127.0.0.1:11434',
-          ANTHROPIC_AUTH_TOKEN: 'ollama',
-          ANTHROPIC_MODEL: 'qwen3-coder',
-          CCS_DROID_PROVIDER: 'generic-chat-completion-api',
-        },
-      }),
-      'utf8'
-    );
-
-    const started = runCli(['proxy', 'start', 'hf', '--port', String(port), '--host', '127.0.0.1']);
-    expect(started.status).toBe(0);
-
-    const status = runCli(['proxy', 'status']);
     expect(status.stdout).toContain(`Proxy running on port ${port}`);
     expect(status.stdout).toContain('Host: 127.0.0.1');
     expect(status.stdout).toContain('Profile: hf');
-
+    const activate = runCli(['proxy', 'activate', 'hf', '--shell', 'bash']);
-    const activate = runCli(['proxy', 'activate', '--shell', 'bash']);
     expect(activate.stdout).toContain(`export ANTHROPIC_BASE_URL='http://127.0.0.1:${port}'`);
     expect(activate.stdout).toMatch(/export ANTHROPIC_AUTH_TOKEN='[a-f0-9]{48}'/);
     expect(activate.stdout).toContain("export DISABLE_TELEMETRY='1'");
     expect(activate.stdout).toContain("export DISABLE_COST_WARNINGS='1'");
     expect(activate.stdout).toContain("export API_TIMEOUT_MS='600000'");
     expect(activate.stdout).toContain("export NO_PROXY='127.0.0.1,localhost'");
-
     const activateFish = runCli(['proxy', 'activate', '--fish']);
     expect(activateFish.stdout).toContain(`set -gx ANTHROPIC_BASE_URL 'http://127.0.0.1:${port}'`);
 
@@ -147,41 +154,54 @@ describe('proxy command e2e', () => {
     expect(stopped.status).toBe(0);
   }, 35000);
 
+  it('respects an explicit --port override in status output', async () => {
+    const port = await getPort();
+    createProfileConfig({
+      hf: {
+        ANTHROPIC_BASE_URL: 'http://127.0.0.1:11434',
+        ANTHROPIC_AUTH_TOKEN: 'ollama',
+        ANTHROPIC_MODEL: 'qwen3-coder',
+        CCS_DROID_PROVIDER: 'generic-chat-completion-api',
+      },
+    });
+    const started = runCli(['proxy', 'start', 'hf', '--port', String(port), '--host', '127.0.0.1']);
+    expect(started.status).toBe(0);
+    const status = runCli(['proxy', 'status', 'hf']);
+    expect(status.status).toBe(0);
+    expect(status.stdout).toContain(`Proxy running on port ${port}`);
+    expect(status.stdout).toContain(`Local URL: http://127.0.0.1:${port}`);
+  }, 35000);
+
+  it('rejects malformed explicit port values instead of coercing numeric prefixes', () => {
+    createProfileConfig({
+      hf: {
+        ANTHROPIC_BASE_URL: 'http://127.0.0.1:11434',
+        ANTHROPIC_AUTH_TOKEN: 'ollama',
+        ANTHROPIC_MODEL: 'qwen3-coder',
+        CCS_DROID_PROVIDER: 'generic-chat-completion-api',
+      },
+    });
+
+    const invalid = runCli(['proxy', 'start', 'hf', '--port', '3456junk']);
+    expect(invalid.status).toBe(1);
+    expect(invalid.stderr).toContain('Invalid port: 3456junk');
+  });
+
   it('requires an explicit profile when activating with multiple running proxies', async () => {
     const firstPort = await getPort();
-    const ccsDir = path.join(tempDir, '.ccs');
+    createProfileConfig({
-    fs.mkdirSync(ccsDir, { recursive: true });
+      ccg: {
-    const firstSettingsPath = path.join(ccsDir, 'ccg.settings.json');
+        ANTHROPIC_BASE_URL: 'http://127.0.0.1:11434',
-    const secondSettingsPath = path.join(ccsDir, 'ccgm.settings.json');
+        ANTHROPIC_AUTH_TOKEN: 'ollama-ccg',
-    fs.writeFileSync(
+        ANTHROPIC_MODEL: 'qwen3-coder',
-      path.join(ccsDir, 'config.json'),
+        CCS_DROID_PROVIDER: 'generic-chat-completion-api',
-      JSON.stringify({ profiles: { ccg: firstSettingsPath, ccgm: secondSettingsPath } }, null, 2),
+      },
-      'utf8'
+      ccgm: {
-    );
+        ANTHROPIC_BASE_URL: 'https://api.openai.com/v1',
-    fs.writeFileSync(
+        ANTHROPIC_AUTH_TOKEN: 'sk-ccgm',
-      firstSettingsPath,
+        ANTHROPIC_MODEL: 'gpt-4.1',
-      JSON.stringify({
+      },
-        env: {
+    });
-          ANTHROPIC_BASE_URL: 'http://127.0.0.1:11434',
-          ANTHROPIC_AUTH_TOKEN: 'ollama-ccg',
-          ANTHROPIC_MODEL: 'qwen3-coder',
-          CCS_DROID_PROVIDER: 'generic-chat-completion-api',
-        },
-      }),
-      'utf8'
-    );
-    fs.writeFileSync(
-      secondSettingsPath,
-      JSON.stringify({
-        env: {
-          ANTHROPIC_BASE_URL: 'https://api.openai.com/v1',
-          ANTHROPIC_AUTH_TOKEN: 'sk-ccgm',
-          ANTHROPIC_MODEL: 'gpt-4.1',
-        },
-      }),
-      'utf8'
-    );
-
     expect(runCli(['proxy', 'start', 'ccg', '--port', String(firstPort)]).status).toBe(0);
     const secondPort = await getPort();
     expect(runCli(['proxy', 'start', 'ccgm', '--port', String(secondPort)]).status).toBe(0);

tests/integration/proxy/daemon-lifecycle.test.ts

@@ -159,6 +159,34 @@ describe('openai proxy daemon lifecycle', () => {
     expect(secondHealth.status).toBe(200);
   });
 
+  it('uses an adaptive implicit port instead of defaulting to 3456 for shared defaults', async () => {
+    const settingsPath = path.join(tempDir, 'adaptive-default.settings.json');
+    fs.writeFileSync(
+      settingsPath,
+      JSON.stringify({
+        env: {
+          ANTHROPIC_BASE_URL: 'https://api.openai.com/v1',
+          ANTHROPIC_AUTH_TOKEN: 'sk-adaptive-default',
+          ANTHROPIC_MODEL: 'gpt-4.1',
+        },
+      }),
+      'utf8'
+    );
+
+    const profile = resolveOpenAICompatProfileConfig('adaptive-default', settingsPath, {
+      ANTHROPIC_BASE_URL: 'https://api.openai.com/v1',
+      ANTHROPIC_AUTH_TOKEN: 'sk-adaptive-default',
+      ANTHROPIC_MODEL: 'gpt-4.1',
+    });
+    if (!profile) {
+      throw new Error('Expected adaptive-default OpenAI-compatible profile');
+    }
+
+    const started = await startOpenAICompatProxy(profile);
+    expect(started.success).toBe(true);
+    expect(started.port).not.toBe(3456);
+  });
+
   it('keeps a legacy singleton daemon visible across upgrade', async () => {
     const port = await getPort();
     const settingsPath = path.join(tempDir, 'legacy.settings.json');
@@ -416,6 +444,55 @@ describe('openai proxy daemon lifecycle', () => {
     expect(started.port).toBe(preferredPort);
   });
 
+  it('does not keep a stopped shared-default profile anchored to legacy port 3456', async () => {
+    const settingsPath = path.join(tempDir, 'legacy-shared-default.settings.json');
+    fs.writeFileSync(
+      settingsPath,
+      JSON.stringify({
+        env: {
+          ANTHROPIC_BASE_URL: 'https://api.openai.com/v1',
+          ANTHROPIC_AUTH_TOKEN: 'sk-legacy-shared-default',
+          ANTHROPIC_MODEL: 'gpt-4.1',
+        },
+      }),
+      'utf8'
+    );
+
+    const profile = resolveOpenAICompatProfileConfig('legacy-shared-default', settingsPath, {
+      ANTHROPIC_BASE_URL: 'https://api.openai.com/v1',
+      ANTHROPIC_AUTH_TOKEN: 'sk-legacy-shared-default',
+      ANTHROPIC_MODEL: 'gpt-4.1',
+    });
+    if (!profile) {
+      throw new Error('Expected legacy-shared-default OpenAI-compatible profile');
+    }
+
+    fs.mkdirSync(path.dirname(getOpenAICompatProxySessionPath('legacy-shared-default')), {
+      recursive: true,
+    });
+    fs.writeFileSync(
+      getOpenAICompatProxySessionPath('legacy-shared-default'),
+      JSON.stringify(
+        {
+          profileName: profile.profileName,
+          settingsPath: profile.settingsPath,
+          host: '127.0.0.1',
+          port: 3456,
+          baseUrl: profile.baseUrl,
+          authToken: 'stale-token',
+          model: profile.model,
+        },
+        null,
+        2
+      ) + '\n',
+      'utf8'
+    );
+
+    const started = await startOpenAICompatProxy(profile);
+    expect(started.success).toBe(true);
+    expect(started.port).not.toBe(3456);
+  });
+
   it('stops legacy daemons even when the legacy session is missing a profile name', async () => {
     const port = await getPort();
     const settingsPath = path.join(tempDir, 'legacy-missing-profile.settings.json');

tests/unit/proxy/proxy-port-resolver.test.ts

@@ -3,7 +3,10 @@ import * as fs from 'fs';
 import * as os from 'os';
 import * as path from 'path';
 import { mutateUnifiedConfig } from '../../../src/config/unified-config-loader';
-import { resolveOpenAICompatProxyPreferredPort } from '../../../src/proxy/proxy-port-resolver';
+import {
+  resolveOpenAICompatProxyAdaptivePort,
+  resolveOpenAICompatProxyPreferredPort,
+} from '../../../src/proxy/proxy-port-resolver';
 
 let originalCcsHome: string | undefined;
 let tempDir: string;
@@ -36,7 +39,57 @@ describe('resolveOpenAICompatProxyPreferredPort', () => {
     expect(resolveOpenAICompatProxyPreferredPort('ccgm')).toBe(3461);
   });
 
-  it('falls back to the shared default port when no profile mapping exists', () => {
+  it('preserves an explicit shared proxy port outside the adaptive default path', () => {
+    mutateUnifiedConfig((config) => {
+      config.proxy = {
+        ...(config.proxy ?? {}),
+        port: 45_000,
+        profile_ports: {},
+      };
+    });
+
+    expect(resolveOpenAICompatProxyPreferredPort('ccg')).toBe(45_000);
+  });
+
+  it('preserves an explicit shared legacy 3456 port when the user configures it', () => {
+    mutateUnifiedConfig((config) => {
+      config.proxy = {
+        ...(config.proxy ?? {}),
+        port: 3456,
+        profile_ports: {},
+      };
+    });
+
     expect(resolveOpenAICompatProxyPreferredPort('ccg')).toBe(3456);
   });
+
+  it('preserves an explicit shared 43456 port when the user configures it', () => {
+    mutateUnifiedConfig((config) => {
+      config.proxy = {
+        ...(config.proxy ?? {}),
+        port: 43_456,
+        profile_ports: {},
+      };
+    });
+
+    expect(resolveOpenAICompatProxyPreferredPort('ccg')).toBe(43_456);
+  });
+
+  it('falls back to an adaptive shared default when no profile mapping exists', () => {
+    const preferredPort = resolveOpenAICompatProxyPreferredPort('ccg');
+
+    expect(preferredPort).toBe(resolveOpenAICompatProxyAdaptivePort('ccg'));
+    expect(preferredPort).not.toBe(3456);
+  });
+
+  it('derives a stable adaptive default that does not keep all profiles on 3456', () => {
+    const first = resolveOpenAICompatProxyPreferredPort('ccg');
+    const second = resolveOpenAICompatProxyPreferredPort('ccg');
+    const other = resolveOpenAICompatProxyPreferredPort('ccgm');
+
+    expect(first).toBe(second);
+    expect(first).not.toBe(3456);
+    expect(other).not.toBe(3456);
+    expect(other).not.toBe(first);
+  });
 });