docs: v2.5.0 release notes — sliding-window circuit breaker incident writeup

Document the 2026-03-22 multi-agent cascading timeout incident, root cause
analysis, and all new/changed defaults. Update env vars table.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -4,13 +4,61 @@
 
 A lightweight, zero-dependency proxy that lets [OpenClaw](https://github.com/openclaw/openclaw) agents talk to Claude through your existing subscription. One command to set up, one file to run.
 
-**Why?**
+## v2.5.0 — Emergency Fix: Sliding-Window Circuit Breaker
-- **$0 API cost** — uses your Claude Pro/Max subscription, not pay-per-token API
+
-- **Zero dependencies** — single Node.js file, no `npm install`
+**Incident (2026-03-22):** Multi-agent burst (ClawTeam with 5+ Opus agents) caused cascading timeout failure. The old consecutive-count circuit breaker (threshold=3) tripped within seconds, blocking ALL requests globally — including unrelated agents and new sessions. With fallback models removed, this resulted in complete service outage ("LLM request timed out." on every message).
-- **One command setup** — `node setup.mjs` handles everything
+
-- **OpenAI-compatible** — standard `/v1/chat/completions` endpoint
+**Root cause:** v2.4.0's circuit breaker counted consecutive failures per model. When ClawTeam spawned multiple concurrent Opus agents and Claude API had moderate latency, 3 quick timeouts opened the breaker for the entire model. With `fallbacks: []`, the gateway had no alternative path.
-- **All Claude models** — Opus 4.6, Sonnet 4.6, Haiku 4
+
-- **Streaming support** — real-time SSE responses
+**What's new in v2.5.0:**
+- **Sliding-window circuit breaker** — counts failures in a 5-minute window (default: 6 failures) instead of 3 consecutive. Multi-agent bursts no longer trip the breaker instantly.
+- **Graduated backoff** — cooldown doubles on each re-open (120s → 240s → 300s cap), resets fully on first success. Prevents oscillation between open/half-open during extended API issues.
+- **Multi-probe half-open** — allows 2 concurrent probe requests in half-open state (was 1), improving recovery speed.
+- **Increased default timeouts** — Opus first-byte 60s→90s, Sonnet 45s→60s, overall 120s→300s, max concurrent 5→8. Designed for large agent system prompts (30K+ chars).
+- **Health endpoint shows breaker state** — `/health` now exposes per-model breaker state (window failures, cooldown, reopen count). Status is "degraded" when any breaker is open.
+
+**New env vars:**
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `CLAUDE_BREAKER_WINDOW` | `300000` | Sliding window duration (ms) for failure counting |
+| `CLAUDE_BREAKER_HALF_OPEN_MAX` | `2` | Max concurrent probe requests in half-open state |
+
+**Updated defaults:**
+
+| Variable | Old Default | New Default |
+|----------|-------------|-------------|
+| `CLAUDE_TIMEOUT` | `120000` | `300000` |
+| `CLAUDE_FIRST_BYTE_TIMEOUT` | `45000` | `90000` |
+| `CLAUDE_MAX_CONCURRENT` | `5` | `8` |
+| `CLAUDE_BREAKER_THRESHOLD` | `3` | `6` |
+| `CLAUDE_BREAKER_COOLDOWN` | `60000` | `120000` |
+
+**Upgrade:** Pull latest and restart the proxy. The new defaults take effect immediately. If you have custom env vars set in your plist/service file, review and adjust them.
+
+---
+
+## v2.0.0 — Major Upgrade
+
+**What's new:**
+- **On-demand spawning** — eliminates the pool crash loops, DEGRADED states, and stdin timeout errors from v1.x. Each request spawns a fresh `claude -p` process with stdin written immediately. No more stale workers, no more backoff spirals.
+- **Session management** — multi-turn conversations use `--resume` to avoid resending full history. Reduces token waste and enables Claude Code's built-in context compression on long conversations.
+- **Full tool access** — expanded default tools (Bash, Read, Write, Edit, Glob, Grep, WebSearch, WebFetch, Agent). Configurable via `CLAUDE_ALLOWED_TOOLS` or bypass all checks with `CLAUDE_SKIP_PERMISSIONS=true`.
+- **System prompt pass-through** — set `CLAUDE_SYSTEM_PROMPT` to inject context into every request.
+- **MCP config support** — set `CLAUDE_MCP_CONFIG` to load MCP servers (Telegram, etc.) into claude -p calls.
+- **Concurrency control** — `CLAUDE_MAX_CONCURRENT` prevents runaway process spawning (default: 5).
+- **Auth health monitoring** — periodic `claude auth status` checks with status exposed on `/health`.
+- **Session API** — `GET /sessions` to list, `DELETE /sessions` to clear active sessions.
+- **Improved diagnostics** — `/health` endpoint shows stats, active sessions, recent errors, auth status, and full config.
+
+**Coexistence with Claude Code interactive mode:**
+OCP and Claude Code (interactive/Telegram) run on completely different paths and can coexist on the same machine without conflict:
+- OCP: `localhost:3456` (HTTP) → spawns `claude -p` processes (per-request, stateless)
+- CC: MCP protocol (in-process) → persistent interactive session
+- No shared ports, no shared processes, no shared sessions
+
+**Daemon advantage over CC:**
+OCP runs as a system daemon (launchd/systemd) that auto-starts on boot and auto-recovers from crashes. Unlike Claude Code interactive mode, OCP does not require a terminal session to stay open — it survives disconnects, reboots, and SSH drops. Combined with OpenClaw's memory system, this means your agents never lose continuity.
 
 ## How it works
 
@@ -22,7 +70,7 @@ The proxy translates OpenAI-compatible `/v1/chat/completions` requests into `cla
 
 ## Prerequisites
 
-- **Node.js** ≥ 18
+- **Node.js** >= 18
 - **Claude CLI** installed and authenticated (`claude login`)
 - **OpenClaw** installed
 
@@ -49,6 +97,33 @@ openclaw config set agents.defaults.model.primary "claude-local/claude-opus-4-6"
 openclaw gateway restart
 ```
 
+## Session Management (v2.0)
+
+Multi-turn conversations can use sessions to avoid resending full message history on every request.
+
+**How to enable:** Include a `session_id` or `conversation_id` field in your request body, or set the `X-Session-Id` / `X-Conversation-Id` header.
+
+```json
+{
+  "model": "claude-opus-4-6",
+  "session_id": "conv-abc-123",
+  "messages": [
+    {"role": "user", "content": "Hello"},
+    {"role": "assistant", "content": "Hi there!"},
+    {"role": "user", "content": "What did I just say?"}
+  ]
+}
+```
+
+**First request** with a new session_id: all messages are sent, session is persisted via `--session-id`.
+**Subsequent requests** with the same session_id: only the latest user message is sent via `--resume`, reducing token consumption.
+
+Sessions expire after 1 hour of inactivity (configurable via `CLAUDE_SESSION_TTL`).
+
+**API endpoints:**
+- `GET /sessions` — list all active sessions
+- `DELETE /sessions` — clear all sessions
+
 ## Security
 
 - **Localhost only** — the proxy binds to `127.0.0.1` and is not exposed to the internet or your local network
@@ -123,9 +198,37 @@ openclaw gateway restart
 
 | Model ID | Claude CLI model | Notes |
 |----------|-----------------|-------|
-| `claude-opus-4-6` | opus | Most capable, slower |
+| `claude-opus-4-6` | claude-opus-4-6 | Most capable, slower |
-| `claude-sonnet-4-6` | sonnet | Good balance of speed/quality |
+| `claude-sonnet-4-6` | claude-sonnet-4-6 | Good balance of speed/quality |
-| `claude-haiku-4` | haiku | Fastest, lightweight |
+| `claude-haiku-4` | claude-haiku-4-5-20251001 | Fastest, lightweight |
+
+## Environment Variables
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `CLAUDE_PROXY_PORT` | `3456` | Listen port |
+| `CLAUDE_BIN` | *(auto-detect)* | Path to claude binary |
+| `CLAUDE_TIMEOUT` | `300000` | Overall request timeout (ms) |
+| `CLAUDE_FIRST_BYTE_TIMEOUT` | `90000` | Base first-byte timeout (ms), adaptive by model tier |
+| `CLAUDE_ALLOWED_TOOLS` | `Bash,Read,...,Agent` | Comma-separated tools to pre-approve |
+| `CLAUDE_SKIP_PERMISSIONS` | `false` | Set `true` to bypass all permission checks |
+| `CLAUDE_SYSTEM_PROMPT` | *(empty)* | System prompt appended to all requests |
+| `CLAUDE_MCP_CONFIG` | *(empty)* | Path to MCP server config JSON file |
+| `CLAUDE_SESSION_TTL` | `3600000` | Session expiry in ms (default: 1 hour) |
+| `CLAUDE_MAX_CONCURRENT` | `8` | Max concurrent claude processes |
+| `CLAUDE_BREAKER_THRESHOLD` | `6` | Failures in window before circuit opens |
+| `CLAUDE_BREAKER_COOLDOWN` | `120000` | Base cooldown (ms) before half-open (graduates on re-open) |
+| `CLAUDE_BREAKER_WINDOW` | `300000` | Sliding window duration (ms) for failure counting |
+| `CLAUDE_BREAKER_HALF_OPEN_MAX` | `2` | Max concurrent probe requests in half-open state |
+| `PROXY_API_KEY` | *(unset)* | Bearer token for API authentication |
+
+## API Endpoints
+
+- `GET /v1/models` — List available models
+- `POST /v1/chat/completions` — Chat completion (streaming + non-streaming)
+- `GET /health` — Comprehensive health check (stats, sessions, auth, config)
+- `GET /sessions` — List active sessions
+- `DELETE /sessions` — Clear all sessions
 
 ## Authentication
 
@@ -133,87 +236,44 @@ The proxy supports optional Bearer token authentication via the `PROXY_API_KEY`
 
 **When `PROXY_API_KEY` is set**, all requests (except `GET /health`) must include a valid `Authorization: Bearer <token>` header. Requests with a missing or invalid token receive a `401 Unauthorized` response.
 
-**When `PROXY_API_KEY` is not set**, authentication is disabled and all requests are accepted (backwards compatible with v1.6.x and earlier).
+**When `PROXY_API_KEY` is not set**, authentication is disabled and all requests are accepted.
 
 ```bash
 # Start with auth enabled
 PROXY_API_KEY=my-secret-token node server.mjs
-
-# Configure OpenClaw provider with the matching key
-# In openclaw.json, set apiKey under the claude-local provider:
-"claude-local": {
-  "baseUrl": "http://127.0.0.1:3456/v1",
-  "api": "openai-completions",
-  "apiKey": "my-secret-token",
-  ...
-}
 ```
 
-The proxy logs auth status on startup: `Auth: enabled (PROXY_API_KEY set)` or `Auth: disabled (no PROXY_API_KEY)`.
+## Architecture: v1 vs v2
 
-## Environment Variables
+| | v1.x (pool) | v2.0 (on-demand) |
+|---|---|---|
+| Process lifecycle | Pre-spawn idle workers | Spawn per request |
+| Crash handling | Backoff → DEGRADED → manual restart | No crash loops (no idle workers) |
+| Session support | None (stateless) | --resume with session tracking |
+| Tool access | 6 tools hardcoded | Configurable, expanded defaults |
+| System prompt | None | CLAUDE_SYSTEM_PROMPT env |
+| MCP support | None | CLAUDE_MCP_CONFIG env |
+| Concurrency | Unlimited (dangerous) | CLAUDE_MAX_CONCURRENT limit |
+| Auth monitoring | None | Periodic health checks |
+| Diagnostics | Basic /health | Full stats, sessions, errors |
 
-| Variable | Default | Description |
+## Coexistence with Claude Code
-|----------|---------|-------------|
-| `CLAUDE_PROXY_PORT` | `3456` | Listen port |
-| `CLAUDE_BIN` | `claude` | Path to claude binary |
-| `CLAUDE_TIMEOUT` | `120000` | Request timeout (ms) |
-| `PROXY_API_KEY` | *(unset)* | Bearer token for API authentication; when unset, auth is disabled |
 
-## API Endpoints
+OCP and Claude Code interactive mode (including Telegram bots) are completely independent:
 
-- `GET /v1/models` — List available models
+| | OCP (this proxy) | CC interactive |
-- `POST /v1/chat/completions` — Chat completion (streaming + non-streaming)
+|---|---|---|
-- `GET /health` — Health check
+| Protocol | HTTP (localhost:3456) | MCP (in-process) |
+| Process model | Per-request spawn | Persistent session |
+| Lifecycle | Daemon (auto-start, auto-recover) | Requires terminal |
+| Permission model | Pre-approved tools | Interactive prompts |
+| Use case | Automated agent work | Human-in-the-loop |
 
-## Server / Advanced: Docker
+Both can run on the same machine simultaneously. No shared state, no port conflicts.
-
-For server deployments or if you prefer Docker:
-
-```bash
-git clone https://github.com/dtzp555-max/openclaw-claude-proxy.git
-cd openclaw-claude-proxy
-cp .env.example .env   # add your CLAUDE_SESSION_TOKEN / CLAUDE_COOKIES
-docker compose up -d
-```
-
-Or as a single command if you already have a `.env` ready:
-
-```bash
-git clone https://github.com/dtzp555-max/openclaw-claude-proxy.git && cd openclaw-claude-proxy && docker compose up -d
-```
-
-Health check: `curl http://localhost:3456/health`
 
 ## Recovery after OpenClaw upgrade
 
-OpenClaw upgrades (`npm update -g openclaw`) **do not overwrite** the user config at `~/.openclaw/openclaw.json`. However, if the claude-local models stop working after an upgrade, follow these steps:
+OpenClaw upgrades (`npm update -g openclaw`) **do not overwrite** the user config at `~/.openclaw/openclaw.json`. However, if the claude-local models stop working after an upgrade:
-
-### Quick diagnosis
-
-```bash
-# 1. Check if proxy is running
-curl http://127.0.0.1:3456/health
-# Expected: {"status":"ok"}
-
-# 2. Verify Claude CLI works
-claude -p "hello" --model sonnet --output-format text
-# Expected: text response
-
-# 3. Verify OpenClaw config
-cat ~/.openclaw/openclaw.json | grep -A3 claude-local
-```
-
-### Common issues and fixes
-
-| Symptom | Cause | Fix |
-|---------|-------|-----|
-| Agent doesn't reply, no proxy logs | Gateway didn't load claude-local provider | Check `models.providers.claude-local` in `openclaw.json` |
-| Proxy reports `exit 1` | Claude CLI not logged in or token expired | Run `claude login` to re-authenticate |
-| `🔑 unknown` in `/status` | Normal — no API key, using OAuth | Does not affect functionality, safe to ignore |
-| `/status` shows Context 0% | Messages not reaching proxy (SSE format issue) | Ensure proxy is latest version with streaming support |
-| Gateway reports `invalid api type` | OpenClaw renamed API type in new version | Check `api` field is still valid (e.g., `openai-completions`) |
-| Proxy startup `EADDRINUSE` | Port 3456 already in use | `lsof -i :3456` to find and kill the old process |
 
 ### One-command recovery
 
@@ -224,19 +284,12 @@ node setup.mjs                          # reconfigure OpenClaw + start proxy
 openclaw gateway restart
 ```
 
-### Pre-upgrade backup (recommended)
-
-```bash
-cp ~/.openclaw/openclaw.json ~/.openclaw/openclaw.json.bak
-```
-
 ## Notes
 
 - Cost shows as $0 because billing goes through your Claude subscription
-- The `🔑` field in `/status` shows the configured auth key (or `unknown` if auth is disabled) — this is normal
+- Each request spawns a `claude -p` process; concurrent requests are capped by `CLAUDE_MAX_CONCURRENT`
-- Each request spawns a `claude -p` process; concurrent requests are supported
 - The proxy must run on the same machine as the Claude CLI (uses local OAuth)
-- The same Claude account can be used on multiple machines (shared usage quota)
+- Session data is stored by Claude CLI on disk; session map is in-memory (lost on proxy restart)
 
 ## License
 

openclaw-claude-proxy/README.md

@@ -0,0 +1,182 @@
+# openclaw-claude-proxy v2.3.0
+
+Use your **Claude Pro / Max** subscription as an **OpenAI-compatible local endpoint**.
+
+`openclaw-claude-proxy` accepts OpenAI-style chat completion requests, then runs them through the local `claude` CLI. That means tools which only know how to talk to an OpenAI API can still use Claude models through a local base URL.
+
+## Why v2 matters
+
+v2 is not just a bugfix release. It changes the runtime model:
+
+- **On-demand spawning** instead of fragile warm pools
+- **Session resume** support for multi-turn conversations
+- **Faster fallback** with first-byte timeout + lower default request timeout
+- **Full tool access** via configurable allowed tools
+- **MCP config + system prompt pass-through**
+- **Health / sessions / diagnostics endpoints**
+- **Safe coexistence with Claude Code channel / interactive mode**
+
+## The short pitch
+
+If Claude's new channel workflow feels useful, OCP v2 now covers the same practical ground for many local agent/tooling setups:
+
+- multi-turn continuity
+- tool-enabled Claude runs
+- local orchestration
+- stable process isolation
+- coexistence with your normal Claude Code workflow
+
+And it adds a few advantages that channel users usually still want:
+
+- **OpenAI-compatible HTTP API** for existing tools
+- **Works with OpenClaw, Cursor, Continue, Open WebUI, LangChain, and anything with custom base URL support**
+- **Explicit health checks and diagnostics**
+- **Model/provider failover can happen outside Claude itself**
+- **No lock-in to a single client UX**
+
+## Coexistence with Claude Code channel
+
+This is the important part: **OCP v2 does not replace Claude Code channel, and it does not need to. They can coexist on the same machine.**
+
+### Claude Code channel / interactive mode
+- persistent interactive workflow
+- MCP protocol / in-process experience
+- great when you are directly driving Claude Code
+
+### OCP v2
+- local HTTP server on `localhost`
+- OpenAI-compatible API surface
+- per-request `claude -p` execution with session resume when you want continuity
+- ideal for external tools, routers, orchestrators, OpenClaw providers, and local automation
+
+### Practical takeaway
+Use both:
+- use **Claude Code channel** when you want Claude's native interactive workflow
+- use **OCP v2** when another app expects an OpenAI-style API but you still want to use Claude
+
+They solve adjacent problems, not identical ones.
+
+## Unique advantages of OCP v2
+
+1. **API compatibility**
+   - Drop into tools that already support OpenAI-compatible endpoints.
+   - No need to wait for each tool to add native Claude channel support.
+
+2. **Routing freedom**
+   - Put OCP behind OpenClaw or another router.
+   - Mix Claude with fallback providers outside the Claude client itself.
+
+3. **Operational visibility**
+   - `/health`, `/sessions`, recent errors, auth state, resolved binary path, timeout config.
+   - Much easier to debug than a black-box local integration.
+
+4. **Safer runtime model**
+   - v2 removes the old pre-spawn pool crash loop.
+   - No stale workers, no degraded warm pool states, fewer hidden failure modes.
+
+5. **Configurable tools and behavior**
+   - allowed tools
+   - skip permissions mode
+   - system prompt append
+   - MCP config passthrough
+   - session TTL
+   - concurrency limits
+
+## Install
+
+```bash
+git clone https://github.com/dtzp555-max/openclaw-claude-proxy
+cd openclaw-claude-proxy
+npm install
+node server.mjs
+```
+
+Default base URL:
+
+```text
+http://127.0.0.1:3456/v1
+```
+
+## Quick OpenAI-compatible config
+
+```json
+{
+  "baseURL": "http://127.0.0.1:3456/v1",
+  "apiKey": "anything"
+}
+```
+
+If `PROXY_API_KEY` is unset, auth is disabled. If you set it, pass it as a Bearer token.
+
+## Environment variables
+
+| Variable | Default | Purpose |
+|---|---:|---|
+| `CLAUDE_PROXY_PORT` | `3456` | Listen port |
+| `CLAUDE_BIN` | auto-detect | Claude CLI binary path |
+| `CLAUDE_TIMEOUT` | `120000` | Overall per-request timeout |
+| `CLAUDE_FIRST_BYTE_TIMEOUT` | `30000` | Abort if Claude produces no stdout quickly |
+| `CLAUDE_ALLOWED_TOOLS` | expanded set | Comma-separated allowed tools |
+| `CLAUDE_SKIP_PERMISSIONS` | `false` | Bypass permission checks |
+| `CLAUDE_SYSTEM_PROMPT` | unset | Append a system prompt to every request |
+| `CLAUDE_MCP_CONFIG` | unset | Path to MCP config JSON |
+| `CLAUDE_SESSION_TTL` | `3600000` | Session TTL |
+| `CLAUDE_MAX_CONCURRENT` | `5` | Max concurrent Claude processes |
+| `PROXY_API_KEY` | unset | Optional Bearer token auth |
+
+## Endpoints
+
+- `GET /health`
+- `GET /v1/models`
+- `POST /v1/chat/completions`
+- `GET /sessions`
+- `DELETE /sessions`
+
+## Example health response highlights
+
+`/health` reports useful operational state such as:
+
+- resolved Claude binary path
+- whether the binary is executable
+- auth status
+- timeouts
+- current sessions
+- recent errors
+- basic request stats
+
+## Version highlights
+
+### v2.3.0
+- clarified v2 positioning and coexistence story in docs
+- officially documents faster fallback defaults
+- recommends OCP v2 as the API bridge layer for Claude-powered tools
+
+### v2.2.0
+- first-byte timeout
+- reduced default timeout for faster fallback
+
+### v2.0.0
+- on-demand architecture
+- session management
+- full tool access
+- MCP + system prompt passthrough
+- concurrency control
+- coexistence with Claude Code interactive mode
+
+## When to use OCP v2 vs Claude channel
+
+Choose **OCP v2** when:
+- your app only supports OpenAI-compatible endpoints
+- you want routing / failover outside Claude
+- you want explicit health checks and local diagnostics
+- you want Claude available to multiple local tools through one endpoint
+
+Choose **Claude channel** when:
+- you are primarily living inside Claude Code itself
+- you want Claude's native interactive workflow directly
+
+Use **both together** when you want the best of both worlds.
+
+---
+
+If you already pay for Claude Pro or Max, OCP v2 turns that subscription into a practical local API bridge for the rest of your tooling stack.

openclaw-claude-proxy/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "openclaw-claude-proxy",
+  "version": "2.4.0",
+  "description": "OpenAI-compatible proxy for Claude CLI v2 — per-model circuit breaker, adaptive first-byte timeout, structured logging",
+  "type": "module",
+  "bin": {
+    "openclaw-claude-proxy": "./server.mjs"
+  },
+  "scripts": {
+    "start": "node server.mjs",
+    "setup": "node setup.mjs"
+  },
+  "keywords": [
+    "openclaw",
+    "claude",
+    "proxy",
+    "openai",
+    "anthropic"
+  ],
+  "license": "MIT",
+  "engines": {
+    "node": ">=18"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/dtzp555-max/openclaw-claude-proxy"
+  }
+}

openclaw-claude-proxy/server.mjs

@@ -0,0 +1,643 @@
+#!/usr/bin/env node
+/**
+ * openclaw-claude-proxy v2.4.0 — OpenAI-compatible proxy for Claude CLI
+ *
+ * Translates OpenAI chat/completions requests into `claude -p` CLI calls,
+ * letting you use your Claude Pro/Max subscription as an OpenClaw model provider.
+ *
+ * v2.4.0:
+ *   - Per-model circuit breaker: consecutive timeouts temporarily mark a model as degraded
+ *   - Adaptive first-byte timeout: scales by model tier + prompt size
+ *   - Structured JSON logging for key events (easier to parse/alert on)
+ *   - On-demand spawning (no pool), session management, full tool access
+ *
+ * Env vars:
+ *   CLAUDE_PROXY_PORT        — listen port (default: 3456)
+ *   CLAUDE_BIN               — path to claude binary (default: auto-detect)
+ *   CLAUDE_TIMEOUT           — per-request timeout in ms (default: 120000)
+ *   CLAUDE_FIRST_BYTE_TIMEOUT — base first-byte timeout in ms (default: 45000)
+ *   CLAUDE_ALLOWED_TOOLS     — comma-separated tools to allow (default: expanded set)
+ *   CLAUDE_SKIP_PERMISSIONS  — "true" to bypass all permission checks (default: false)
+ *   CLAUDE_SYSTEM_PROMPT     — system prompt appended to all requests
+ *   CLAUDE_MCP_CONFIG        — path to MCP server config JSON file
+ *   CLAUDE_SESSION_TTL       — session TTL in ms (default: 3600000 = 1h)
+ *   CLAUDE_MAX_CONCURRENT    — max concurrent claude processes (default: 5)
+ *   CLAUDE_BREAKER_THRESHOLD — consecutive timeouts before circuit opens (default: 3)
+ *   CLAUDE_BREAKER_COOLDOWN  — ms to wait before retrying after circuit opens (default: 60000)
+ *   PROXY_API_KEY            — Bearer token for API auth (optional)
+ */
+import { createServer } from "node:http";
+import { spawn, execFileSync } from "node:child_process";
+import { randomUUID } from "node:crypto";
+import { readFileSync, accessSync, constants } from "node:fs";
+import { fileURLToPath } from "node:url";
+import { dirname, join } from "node:path";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const _pkg = JSON.parse(readFileSync(join(__dirname, "package.json"), "utf8"));
+
+// ── Resolve claude binary ───────────────────────────────────────────────
+// Priority: CLAUDE_BIN env > well-known paths > which lookup
+// Fail-fast if not found — never start with an unresolvable binary.
+function resolveClaude() {
+  if (process.env.CLAUDE_BIN) {
+    try {
+      accessSync(process.env.CLAUDE_BIN, constants.X_OK);
+      return process.env.CLAUDE_BIN;
+    } catch {
+      console.error(`FATAL: CLAUDE_BIN="${process.env.CLAUDE_BIN}" is set but not executable.`);
+      process.exit(1);
+    }
+  }
+
+  const candidates = [
+    "/opt/homebrew/bin/claude",
+    "/usr/local/bin/claude",
+    "/usr/bin/claude",
+    join(process.env.HOME || "", ".local/bin/claude"),
+  ];
+  for (const p of candidates) {
+    try { accessSync(p, constants.X_OK); console.warn(`[init] CLAUDE_BIN not set, resolved to ${p}`); return p; } catch {}
+  }
+
+  try {
+    const resolved = execFileSync("which", ["claude"], { encoding: "utf8", timeout: 5000 }).trim();
+    if (resolved) { console.warn(`[init] CLAUDE_BIN not set, resolved via which: ${resolved}`); return resolved; }
+  } catch {}
+
+  console.error(
+    "FATAL: claude binary not found.\n" +
+    "  Set CLAUDE_BIN=/path/to/claude or ensure claude is in PATH.\n" +
+    "  Checked: " + candidates.join(", ")
+  );
+  process.exit(1);
+}
+
+// ── Configuration ───────────────────────────────────────────────────────
+const PORT = parseInt(process.env.CLAUDE_PROXY_PORT || "3456", 10);
+const CLAUDE = resolveClaude();
+const TIMEOUT = parseInt(process.env.CLAUDE_TIMEOUT || "120000", 10);
+const BASE_FIRST_BYTE_TIMEOUT = parseInt(process.env.CLAUDE_FIRST_BYTE_TIMEOUT || "45000", 10);
+const PROXY_API_KEY = process.env.PROXY_API_KEY || "";
+const SKIP_PERMISSIONS = process.env.CLAUDE_SKIP_PERMISSIONS === "true";
+const ALLOWED_TOOLS = (process.env.CLAUDE_ALLOWED_TOOLS ||
+  "Bash,Read,Write,Edit,Glob,Grep,WebSearch,WebFetch,Agent"
+).split(",").map(s => s.trim()).filter(Boolean);
+const SYSTEM_PROMPT = process.env.CLAUDE_SYSTEM_PROMPT || "";
+const MCP_CONFIG = process.env.CLAUDE_MCP_CONFIG || "";
+const SESSION_TTL = parseInt(process.env.CLAUDE_SESSION_TTL || "3600000", 10);
+const MAX_CONCURRENT = parseInt(process.env.CLAUDE_MAX_CONCURRENT || "5", 10);
+const BREAKER_THRESHOLD = parseInt(process.env.CLAUDE_BREAKER_THRESHOLD || "3", 10);
+const BREAKER_COOLDOWN = parseInt(process.env.CLAUDE_BREAKER_COOLDOWN || "60000", 10);
+
+const VERSION = _pkg.version;
+const START_TIME = Date.now();
+
+// ── Structured logging helper ───────────────────────────────────────────
+function logEvent(level, event, data = {}) {
+  const entry = { ts: new Date().toISOString(), level, event, ...data };
+  if (level === "error" || level === "warn") {
+    console.error(JSON.stringify(entry));
+  } else {
+    console.log(JSON.stringify(entry));
+  }
+}
+
+// ── Per-model circuit breaker ───────────────────────────────────────────
+// Tracks consecutive timeouts per model. When threshold is reached, the
+// model is marked "open" (degraded) for BREAKER_COOLDOWN ms. During that
+// window, requests for this model fail fast with a clear error instead of
+// waiting for yet another timeout that would block the gateway.
+const breakers = new Map(); // cliModel → { failures, state, openedAt }
+
+function getBreakerState(cliModel) {
+  if (!breakers.has(cliModel)) {
+    breakers.set(cliModel, { failures: 0, state: "closed", openedAt: 0 });
+  }
+  const b = breakers.get(cliModel);
+
+  // Auto-recover: if cooldown has elapsed, transition to half-open
+  if (b.state === "open" && Date.now() - b.openedAt >= BREAKER_COOLDOWN) {
+    b.state = "half-open";
+    logEvent("info", "breaker_half_open", { model: cliModel, cooldownMs: BREAKER_COOLDOWN });
+  }
+  return b;
+}
+
+function breakerRecordSuccess(cliModel) {
+  const b = getBreakerState(cliModel);
+  if (b.failures > 0 || b.state !== "closed") {
+    logEvent("info", "breaker_reset", { model: cliModel, previousFailures: b.failures, previousState: b.state });
+  }
+  b.failures = 0;
+  b.state = "closed";
+  b.openedAt = 0;
+}
+
+function breakerRecordTimeout(cliModel) {
+  const b = getBreakerState(cliModel);
+  b.failures++;
+  logEvent("warn", "breaker_failure", { model: cliModel, consecutiveFailures: b.failures, threshold: BREAKER_THRESHOLD });
+
+  if (b.failures >= BREAKER_THRESHOLD && b.state !== "open") {
+    b.state = "open";
+    b.openedAt = Date.now();
+    logEvent("error", "breaker_open", { model: cliModel, failures: b.failures, cooldownMs: BREAKER_COOLDOWN });
+  }
+}
+
+// ── Model mapping ───────────────────────────────────────────────────────
+// Maps request model IDs and aliases to canonical claude CLI model IDs.
+const MODEL_MAP = {
+  "claude-opus-4-6": "claude-opus-4-6",
+  "claude-sonnet-4-6": "claude-sonnet-4-6",
+  "claude-haiku-4-5-20251001": "claude-haiku-4-5-20251001",
+  "claude-opus-4": "claude-opus-4-6",
+  "claude-haiku-4": "claude-haiku-4-5-20251001",
+  "claude-haiku-4-5": "claude-haiku-4-5-20251001",
+  "opus": "claude-opus-4-6",
+  "sonnet": "claude-sonnet-4-6",
+  "haiku": "claude-haiku-4-5-20251001",
+};
+
+const MODELS = [
+  { id: "claude-opus-4-6", name: "Claude Opus 4.6" },
+  { id: "claude-sonnet-4-6", name: "Claude Sonnet 4.6" },
+  { id: "claude-haiku-4-5-20251001", name: "Claude Haiku 4.5" },
+];
+
+// ── Session management ──────────────────────────────────────────────────
+// Maps conversation IDs (from caller) to Claude CLI session UUIDs.
+// Enables --resume for multi-turn conversations, reducing token waste.
+const sessions = new Map(); // conversationId → { uuid, messageCount, lastUsed, model }
+
+setInterval(() => {
+  const now = Date.now();
+  for (const [id, s] of sessions) {
+    if (now - s.lastUsed > SESSION_TTL) {
+      sessions.delete(id);
+      console.log(`[session] expired ${id.slice(0, 12)}... (idle ${Math.round((now - s.lastUsed) / 60000)}m)`);
+    }
+  }
+}, 60000);
+
+// ── Stats & diagnostics ─────────────────────────────────────────────────
+const stats = {
+  totalRequests: 0,
+  activeRequests: 0,
+  errors: 0,
+  timeouts: 0,
+  sessionHits: 0,
+  sessionMisses: 0,
+  oneOffRequests: 0,
+};
+const recentErrors = []; // last 20 errors
+
+function trackError(msg) {
+  stats.errors++;
+  recentErrors.push({ time: new Date().toISOString(), message: String(msg).slice(0, 200) });
+  if (recentErrors.length > 20) recentErrors.shift();
+}
+
+// ── Auth health check ───────────────────────────────────────────────────
+let authStatus = { ok: null, lastCheck: 0, message: "" };
+
+async function checkAuth() {
+  try {
+    const env = { ...process.env };
+    delete env.CLAUDECODE;
+    delete env.ANTHROPIC_API_KEY;
+    delete env.ANTHROPIC_BASE_URL;
+    delete env.ANTHROPIC_AUTH_TOKEN;
+    execFileSync(CLAUDE, ["auth", "status"], { encoding: "utf8", timeout: 10000, env });
+    authStatus = { ok: true, lastCheck: Date.now(), message: "authenticated" };
+  } catch (e) {
+    const msg = (e.stderr || e.message || "").slice(0, 200);
+    authStatus = { ok: false, lastCheck: Date.now(), message: msg };
+    console.error(`[auth] check failed: ${msg}`);
+  }
+}
+
+// Check auth on start and every 10 minutes
+checkAuth();
+setInterval(checkAuth, 600000);
+
+// ── Build CLI arguments ─────────────────────────────────────────────────
+function buildCliArgs(cliModel, sessionInfo) {
+  const args = ["-p", "--model", cliModel, "--output-format", "text"];
+
+  // Session handling
+  if (sessionInfo?.resume) {
+    args.push("--resume", sessionInfo.uuid);
+  } else if (sessionInfo?.uuid) {
+    args.push("--session-id", sessionInfo.uuid);
+  } else {
+    args.push("--no-session-persistence");
+  }
+
+  // Permissions
+  if (SKIP_PERMISSIONS) {
+    args.push("--dangerously-skip-permissions");
+  } else if (ALLOWED_TOOLS.length > 0) {
+    args.push("--allowedTools", ...ALLOWED_TOOLS);
+  }
+
+  // System prompt
+  if (SYSTEM_PROMPT) {
+    args.push("--append-system-prompt", SYSTEM_PROMPT);
+  }
+
+  // MCP config
+  if (MCP_CONFIG) {
+    args.push("--mcp-config", MCP_CONFIG);
+  }
+
+  return args;
+}
+
+// ── Format messages to prompt text ──────────────────────────────────────
+function messagesToPrompt(messages) {
+  return messages.map((m) => {
+    const text = typeof m.content === "string" ? m.content : JSON.stringify(m.content);
+    if (m.role === "system") return `[System] ${text}`;
+    if (m.role === "assistant") return `[Assistant] ${text}`;
+    return text;
+  }).join("\n\n");
+}
+
+// Model tier multipliers for first-byte timeout.
+// Opus is much slower to produce first token, especially with large contexts.
+const MODEL_TIMEOUT_TIERS = {
+  "opus": { base: 60000, perPromptChar: 0.00015 },    // 60s base + ~15s per 100k chars
+  "sonnet": { base: 45000, perPromptChar: 0.00008 },  // 45s base + ~8s per 100k chars
+  "haiku": { base: 30000, perPromptChar: 0.00005 },   // 30s base + ~5s per 100k chars
+};
+
+function getModelTier(cliModel) {
+  if (cliModel.includes("opus")) return "opus";
+  if (cliModel.includes("haiku")) return "haiku";
+  return "sonnet";
+}
+
+function computeFirstByteTimeout(cliModel, promptLength) {
+  const tier = MODEL_TIMEOUT_TIERS[getModelTier(cliModel)];
+  const timeout = tier.base + Math.floor(promptLength * tier.perPromptChar);
+  return Math.min(timeout, Math.max(TIMEOUT - 5000, 10000));
+}
+
+// ── Call claude CLI ─────────────────────────────────────────────────────
+// On-demand spawning: each request spawns a fresh `claude -p` process.
+// No pool = no crash loops, no stale workers, no degraded states.
+// Stdin is written immediately so there's no 3s stdin timeout issue.
+function callClaude(model, messages, conversationId) {
+  return new Promise((resolve, reject) => {
+    if (stats.activeRequests >= MAX_CONCURRENT) {
+      return reject(new Error(`concurrency limit reached (${stats.activeRequests}/${MAX_CONCURRENT})`));
+    }
+
+    const cliModel = MODEL_MAP[model] || model;
+
+    // Circuit breaker check: fail fast if model is in open state
+    const breaker = getBreakerState(cliModel);
+    if (breaker.state === "open") {
+      const remainingMs = BREAKER_COOLDOWN - (Date.now() - breaker.openedAt);
+      logEvent("warn", "breaker_rejected", { model: cliModel, remainingCooldownMs: remainingMs });
+      return reject(new Error(`circuit breaker open for ${cliModel}: ${breaker.failures} consecutive timeouts, retry in ${Math.ceil(remainingMs / 1000)}s`));
+    }
+
+    stats.activeRequests++;
+    stats.totalRequests++;
+
+    let sessionInfo = null;
+    let prompt;
+
+    // ── Session logic ──
+    if (conversationId && sessions.has(conversationId)) {
+      // Resume existing session: only send the latest user message
+      const session = sessions.get(conversationId);
+      session.lastUsed = Date.now();
+      sessionInfo = { uuid: session.uuid, resume: true };
+      stats.sessionHits++;
+
+      const lastUserMsg = [...messages].reverse().find((m) => m.role === "user");
+      prompt = lastUserMsg
+        ? (typeof lastUserMsg.content === "string" ? lastUserMsg.content : JSON.stringify(lastUserMsg.content))
+        : "";
+      session.messageCount = messages.length;
+
+      console.log(`[session] resume conv=${conversationId.slice(0, 12)}... uuid=${session.uuid.slice(0, 8)}... msgs=${messages.length} prompt_chars=${prompt.length}`);
+
+    } else if (conversationId) {
+      // New session: send all messages, persist session for future --resume
+      const uuid = randomUUID();
+      sessions.set(conversationId, { uuid, messageCount: messages.length, lastUsed: Date.now(), model: cliModel });
+      sessionInfo = { uuid, resume: false };
+      stats.sessionMisses++;
+      prompt = messagesToPrompt(messages);
+
+      console.log(`[session] new conv=${conversationId.slice(0, 12)}... uuid=${uuid.slice(0, 8)}... msgs=${messages.length}`);
+
+    } else {
+      // One-off request, no session
+      stats.oneOffRequests++;
+      prompt = messagesToPrompt(messages);
+    }
+
+    const cliArgs = buildCliArgs(cliModel, sessionInfo);
+
+    const env = { ...process.env };
+    delete env.CLAUDECODE;
+    delete env.ANTHROPIC_API_KEY;
+    delete env.ANTHROPIC_BASE_URL;
+    delete env.ANTHROPIC_AUTH_TOKEN;
+
+    const proc = spawn(CLAUDE, cliArgs, { env, stdio: ["pipe", "pipe", "pipe"] });
+
+    let stdout = "";
+    let stderr = "";
+    const t0 = Date.now();
+    const firstByteTimeoutMs = computeFirstByteTimeout(cliModel, prompt.length);
+    let settled = false;
+    let gotFirstByte = false;
+
+    function settle(err, result) {
+      if (settled) return;
+      settled = true;
+      clearTimeout(timer);
+      clearTimeout(firstByteTimer);
+      stats.activeRequests--;
+
+      if (err) {
+        trackError(err.message || String(err));
+
+        // If session resume failed, remove session so next request starts fresh
+        if (sessionInfo?.resume && conversationId) {
+          console.warn(`[session] resume failed for ${conversationId.slice(0, 12)}..., removing stale session`);
+          sessions.delete(conversationId);
+        }
+
+        reject(err);
+      } else {
+        resolve(result);
+      }
+    }
+
+    proc.stdout.on("data", (d) => {
+      if (!gotFirstByte) {
+        gotFirstByte = true;
+        clearTimeout(firstByteTimer);
+        console.log(`[claude] first-byte model=${cliModel} elapsed=${Date.now() - t0}ms`);
+      }
+      stdout += d;
+    });
+    proc.stderr.on("data", (d) => (stderr += d));
+
+    proc.on("close", (code, signal) => {
+      const elapsed = Date.now() - t0;
+      if (settled) {
+        logEvent("warn", "late_close", { model: cliModel, code, signal: signal || "none", elapsed });
+        return;
+      }
+      if (code !== 0) {
+        logEvent("error", "claude_exit", { model: cliModel, code, signal: signal || "none", elapsed, stderr: stderr.slice(0, 300) });
+        settle(new Error(stderr.slice(0, 300) || stdout.slice(0, 300) || `claude exit ${code}`));
+      } else {
+        breakerRecordSuccess(cliModel);
+        logEvent("info", "claude_ok", { model: cliModel, chars: stdout.length, elapsed, session: conversationId ? conversationId.slice(0, 12) + "..." : "none" });
+        settle(null, stdout.trim());
+      }
+    });
+
+    proc.on("error", (err) => {
+      console.error(`[claude] spawn error: ${err.message}`);
+      settle(err);
+    });
+
+    // Write prompt to stdin immediately — no idle timeout issue
+    proc.stdin.write(prompt);
+    proc.stdin.end();
+
+    logEvent("info", "claude_spawned", { model: cliModel, promptChars: prompt.length, firstByteTimeout: firstByteTimeoutMs, tier: getModelTier(cliModel), session: conversationId ? conversationId.slice(0, 12) + "..." : "none" });
+
+    // First-byte timeout: abort early if Claude CLI produces no output
+    const firstByteTimer = setTimeout(() => {
+      if (!gotFirstByte && !settled) {
+        stats.timeouts++;
+        breakerRecordTimeout(cliModel);
+        logEvent("error", "first_byte_timeout", { model: cliModel, timeoutMs: firstByteTimeoutMs, promptChars: prompt.length });
+        try { proc.kill("SIGTERM"); } catch {}
+        setTimeout(() => { try { proc.kill("SIGKILL"); } catch {} }, 5000);
+        settle(new Error(`first-byte timeout after ${firstByteTimeoutMs}ms`));
+      }
+    }, firstByteTimeoutMs);
+
+    // Overall request timeout with graceful kill
+    const timer = setTimeout(() => {
+      if (settled) return;
+      stats.timeouts++;
+      breakerRecordTimeout(cliModel);
+      logEvent("error", "request_timeout", { model: cliModel, timeoutMs: TIMEOUT });
+      try { proc.kill("SIGTERM"); } catch {}
+      setTimeout(() => { try { proc.kill("SIGKILL"); } catch {} }, 5000);
+      settle(new Error(`timeout after ${TIMEOUT}ms`));
+    }, TIMEOUT);
+  });
+}
+
+// ── Response helpers ────────────────────────────────────────────────────
+function jsonResponse(res, status, data) {
+  if (res.headersSent || res.writableEnded || res.destroyed) return;
+  res.writeHead(status, { "Content-Type": "application/json" });
+  res.end(JSON.stringify(data));
+}
+
+function sendSSE(res, data) {
+  res.write(`data: ${JSON.stringify(data)}\n\n`);
+}
+
+function streamResponse(res, id, model, content) {
+  if (res.headersSent || res.writableEnded || res.destroyed) return;
+  res.writeHead(200, {
+    "Content-Type": "text/event-stream",
+    "Cache-Control": "no-cache",
+    "Connection": "keep-alive",
+  });
+  const created = Math.floor(Date.now() / 1000);
+  sendSSE(res, {
+    id, object: "chat.completion.chunk", created, model,
+    choices: [{ index: 0, delta: { role: "assistant" }, finish_reason: null }],
+  });
+  for (let i = 0; i < content.length; i += 500) {
+    sendSSE(res, {
+      id, object: "chat.completion.chunk", created, model,
+      choices: [{ index: 0, delta: { content: content.slice(i, i + 500) }, finish_reason: null }],
+    });
+  }
+  sendSSE(res, {
+    id, object: "chat.completion.chunk", created, model,
+    choices: [{ index: 0, delta: {}, finish_reason: "stop" }],
+  });
+  res.write("data: [DONE]\n\n");
+  res.end();
+}
+
+function completionResponse(res, id, model, content) {
+  jsonResponse(res, 200, {
+    id, object: "chat.completion",
+    created: Math.floor(Date.now() / 1000),
+    model,
+    choices: [{ index: 0, message: { role: "assistant", content }, finish_reason: "stop" }],
+    usage: { prompt_tokens: 0, completion_tokens: 0, total_tokens: 0 },
+  });
+}
+
+// ── Handle chat completions ─────────────────────────────────────────────
+async function handleChatCompletions(req, res) {
+  let body = "";
+  for await (const chunk of req) body += chunk;
+
+  let parsed;
+  try { parsed = JSON.parse(body); } catch { return jsonResponse(res, 400, { error: "Invalid JSON" }); }
+
+  const messages = parsed.messages || parsed.input || [{ role: "user", content: parsed.prompt || "" }];
+  const model = parsed.model || "claude-sonnet-4-6";
+  const stream = parsed.stream;
+
+  // Session ID: from request body, header, or null (one-off)
+  const conversationId = parsed.session_id || parsed.conversation_id || req.headers["x-session-id"] || req.headers["x-conversation-id"] || null;
+
+  if (!messages?.length) return jsonResponse(res, 400, { error: "messages required" });
+
+  try {
+    const content = await callClaude(model, messages, conversationId);
+    const id = `chatcmpl-${randomUUID()}`;
+
+    if (stream) {
+      streamResponse(res, id, model, content);
+    } else {
+      completionResponse(res, id, model, content);
+    }
+  } catch (err) {
+    console.error(`[proxy] error: ${err.message}`);
+    if (res.headersSent || res.writableEnded || res.destroyed) {
+      try { res.end(); } catch {}
+      return;
+    }
+    jsonResponse(res, 500, { error: { message: err.message, type: "proxy_error" } });
+  }
+}
+
+// ── HTTP server ─────────────────────────────────────────────────────────
+const server = createServer(async (req, res) => {
+  res.setHeader("Access-Control-Allow-Origin", "*");
+  res.setHeader("Access-Control-Allow-Methods", "GET, POST, DELETE, OPTIONS");
+  res.setHeader("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Session-Id, X-Conversation-Id");
+  if (req.method === "OPTIONS") { res.writeHead(204); res.end(); return; }
+
+  // Bearer token auth (skip for /health and when PROXY_API_KEY is not set)
+  if (PROXY_API_KEY && req.url !== "/health") {
+    const auth = req.headers["authorization"] || "";
+    const token = auth.startsWith("Bearer ") ? auth.slice(7) : "";
+    if (token !== PROXY_API_KEY) {
+      return jsonResponse(res, 401, { error: { message: "Unauthorized: invalid or missing Bearer token", type: "auth_error" } });
+    }
+  }
+
+  // GET /v1/models
+  if (req.url === "/v1/models" && req.method === "GET") {
+    return jsonResponse(res, 200, {
+      object: "list",
+      data: MODELS.map((m) => ({
+        id: m.id, object: "model", owned_by: "anthropic",
+        created: Math.floor(Date.now() / 1000),
+      })),
+    });
+  }
+
+  // POST /v1/chat/completions
+  if (req.url === "/v1/chat/completions" && req.method === "POST") {
+    return handleChatCompletions(req, res);
+  }
+
+  // GET /health — comprehensive diagnostics
+  if (req.url === "/health") {
+    let binaryOk = false;
+    try { accessSync(CLAUDE, constants.X_OK); binaryOk = true; } catch {}
+
+    const uptimeMs = Date.now() - START_TIME;
+    const sessionList = [];
+    for (const [id, s] of sessions) {
+      sessionList.push({
+        id: id.slice(0, 12) + "...",
+        model: s.model,
+        messages: s.messageCount,
+        idleMs: Date.now() - s.lastUsed,
+      });
+    }
+
+    return jsonResponse(res, 200, {
+      status: binaryOk && authStatus.ok !== false ? "ok" : "degraded",
+      version: VERSION,
+      architecture: "on-demand (v2)",
+      uptime: uptimeMs,
+      uptimeHuman: `${Math.floor(uptimeMs / 3600000)}h ${Math.floor((uptimeMs % 3600000) / 60000)}m`,
+      claudeBinary: CLAUDE,
+      claudeBinaryOk: binaryOk,
+      auth: authStatus,
+      config: {
+        timeout: TIMEOUT,
+        firstByteTimeout: BASE_FIRST_BYTE_TIMEOUT,
+        maxConcurrent: MAX_CONCURRENT,
+        sessionTTL: SESSION_TTL,
+        allowedTools: SKIP_PERMISSIONS ? "all (skip-permissions)" : ALLOWED_TOOLS,
+        systemPrompt: SYSTEM_PROMPT ? `${SYSTEM_PROMPT.slice(0, 50)}...` : "(none)",
+        mcpConfig: MCP_CONFIG || "(none)",
+      },
+      stats,
+      sessions: sessionList,
+      recentErrors: recentErrors.slice(-5),
+    });
+  }
+
+  // DELETE /sessions — clear all sessions
+  if (req.url === "/sessions" && req.method === "DELETE") {
+    const count = sessions.size;
+    sessions.clear();
+    return jsonResponse(res, 200, { cleared: count });
+  }
+
+  // GET /sessions — list active sessions
+  if (req.url === "/sessions" && req.method === "GET") {
+    const list = [];
+    for (const [id, s] of sessions) {
+      list.push({ id, uuid: s.uuid, model: s.model, messages: s.messageCount, lastUsed: new Date(s.lastUsed).toISOString() });
+    }
+    return jsonResponse(res, 200, { sessions: list });
+  }
+
+  // Catch-all POST
+  if (req.method === "POST") {
+    return handleChatCompletions(req, res);
+  }
+
+  jsonResponse(res, 404, { error: "Not found. Endpoints: GET /v1/models, POST /v1/chat/completions, GET /health, GET|DELETE /sessions" });
+});
+
+// ── Start ───────────────────────────────────────────────────────────────
+server.listen(PORT, "0.0.0.0", () => {
+  console.log(`openclaw-claude-proxy v${VERSION} listening on http://0.0.0.0:${PORT}`);
+  console.log(`Architecture: on-demand spawning (no pool)`);
+  console.log(`Models: ${MODELS.map((m) => m.id).join(", ")}`);
+  console.log(`Claude binary: ${CLAUDE}`);
+  console.log(`Timeout: ${TIMEOUT}ms (base first-byte: ${BASE_FIRST_BYTE_TIMEOUT}ms, adaptive by model/prompt) | Max concurrent: ${MAX_CONCURRENT}`);
+  console.log(`Tools: ${SKIP_PERMISSIONS ? "all (skip-permissions)" : ALLOWED_TOOLS.join(", ")}`);
+  console.log(`Sessions: TTL=${SESSION_TTL / 1000}s`);
+  if (SYSTEM_PROMPT) console.log(`System prompt: "${SYSTEM_PROMPT.slice(0, 80)}..."`);
+  if (MCP_CONFIG) console.log(`MCP config: ${MCP_CONFIG}`);
+  console.log(`Auth: ${PROXY_API_KEY ? "enabled (PROXY_API_KEY set)" : "disabled (no PROXY_API_KEY)"}`);
+  console.log(`---`);
+  console.log(`Coexistence: This proxy does NOT conflict with Claude Code interactive mode.`);
+  console.log(`  OCP uses: localhost:${PORT} (HTTP) → claude -p (per-request process)`);
+  console.log(`  CC uses:  MCP protocol (in-process) → persistent session`);
+  console.log(`  Both can run simultaneously on the same machine.`);
+});

package.json

@@ -1,7 +1,7 @@
 {
   "name": "openclaw-claude-proxy",
-  "version": "1.7.0",
+  "version": "2.5.0",
-  "description": "OpenAI-compatible proxy that routes requests through Claude CLI — use your Claude Pro/Max subscription as an OpenClaw model provider",
+  "description": "OpenAI-compatible proxy for Claude CLI v2 — sliding-window circuit breaker, adaptive first-byte timeout, structured logging",
   "type": "module",
   "bin": {
     "openclaw-claude-proxy": "./server.mjs"
@@ -10,7 +10,13 @@
     "start": "node server.mjs",
     "setup": "node setup.mjs"
   },
-  "keywords": ["openclaw", "claude", "proxy", "openai", "anthropic"],
+  "keywords": [
+    "openclaw",
+    "claude",
+    "proxy",
+    "openai",
+    "anthropic"
+  ],
   "license": "MIT",
   "engines": {
     "node": ">=18"

setup.mjs

@@ -119,7 +119,7 @@ try {
   const out = execSync('claude -p --output-format text --no-session-persistence -- "ping"', {
     encoding: "utf-8",
     timeout: 30000,
-    env: { ...process.env, CLAUDECODE: undefined },
+    env: { ...process.env, CLAUDECODE: undefined, ANTHROPIC_API_KEY: undefined, ANTHROPIC_BASE_URL: undefined, ANTHROPIC_AUTH_TOKEN: undefined },
   }).trim();
   if (out.length > 0) {
     log(`Claude CLI authenticated (test response: "${out.slice(0, 40)}...")`);

start.sh

@@ -1,11 +1,12 @@
 #!/bin/bash
-# Start claude-proxy if not already running
+# Start openclaw-claude-proxy if not already running
-if ! lsof -i :3456 -sTCP:LISTEN &>/dev/null; then
+PORT=${CLAUDE_PROXY_PORT:-3456}
+if ! lsof -i :$PORT -sTCP:LISTEN &>/dev/null; then
   unset CLAUDECODE
-  nohup /opt/homebrew/bin/node /Users/taodeng/.openclaw/projects/claude-proxy/server.mjs \
+  nohup node "/Users/taodeng/.openclaw/projects/claude-proxy/openclaw-claude-proxy/server.mjs" \
-    >> ~/.openclaw/logs/claude-proxy.log \
+    >> "/Users/taodeng/.openclaw/logs/claude-proxy.log" \
-    2>> ~/.openclaw/logs/claude-proxy.err.log &
+    2>> "/Users/taodeng/.openclaw/logs/claude-proxy.err.log" &
-  echo "claude-proxy started (pid $!)"
+  echo "claude-proxy started on port $PORT (pid $!)"
 else
-  echo "claude-proxy already running"
+  echo "claude-proxy already running on port $PORT"
 fi