fix(mcp): add retry logic for Playwright MCP browser sidecar startup

packages/app/src/docker-git/cli/usage.ts

@@ -81,6 +81,8 @@ Container runtime env (set via .orch/env/project.env):
   DOCKER_GIT_ZSH_AUTOSUGGEST_STRATEGY=...  Suggestion sources (default: history completion)
   MCP_PLAYWRIGHT_ISOLATED=1|0           Isolated browser contexts (recommended for many Codex; default: 1)
   MCP_PLAYWRIGHT_CDP_ENDPOINT=http://...  Override CDP endpoint (default: http://dg-<repo>-browser:9223)
+  MCP_PLAYWRIGHT_RETRY_ATTEMPTS=<n>     Retry attempts for browser sidecar startup wait (default: 10)
+  MCP_PLAYWRIGHT_RETRY_DELAY=<seconds>  Delay between retry attempts (default: 2)
 
 Auth providers:
   github, gh         GitHub CLI auth (tokens saved to env file)

packages/lib/src/core/templates/dockerfile.ts

@@ -105,8 +105,39 @@ if [[ -z "$CDP_ENDPOINT" ]]; then
   CDP_ENDPOINT="http://__SERVICE_NAME__-browser:9223"
 fi
 
+# CHANGE: add retry logic for browser sidecar startup wait
+# WHY: the browser container may take time to initialize, causing MCP server to fail on first attempt
+# QUOTE(issue-123): "Почему MCP сервер лежит с ошибкой?"
+# REF: issue-123
+# SOURCE: n/a
+# FORMAT THEOREM: forall t in [1..max_attempts]: retry(t) -> eventually(cdp_ready) OR timeout_error
+# PURITY: SHELL
+# INVARIANT: script exits only after cdp_ready OR all retries exhausted
+# COMPLEXITY: O(max_attempts * timeout_per_attempt)
+MCP_PLAYWRIGHT_RETRY_ATTEMPTS="\${MCP_PLAYWRIGHT_RETRY_ATTEMPTS:-10}"
+MCP_PLAYWRIGHT_RETRY_DELAY="\${MCP_PLAYWRIGHT_RETRY_DELAY:-2}"
+
+fetch_cdp_version() {
+  curl -sSf --connect-timeout 3 --max-time 10 -H 'Host: 127.0.0.1:9222' "\${CDP_ENDPOINT%/}/json/version" 2>/dev/null
+}
+
+JSON=""
+for attempt in $(seq 1 "$MCP_PLAYWRIGHT_RETRY_ATTEMPTS"); do
+  if JSON="$(fetch_cdp_version)"; then
+    break
+  fi
+  if [[ "$attempt" -lt "$MCP_PLAYWRIGHT_RETRY_ATTEMPTS" ]]; then
+    echo "docker-git-playwright-mcp: waiting for browser sidecar (attempt $attempt/$MCP_PLAYWRIGHT_RETRY_ATTEMPTS)..." >&2
+    sleep "$MCP_PLAYWRIGHT_RETRY_DELAY"
+  fi
+done
+
+if [[ -z "$JSON" ]]; then
+  echo "docker-git-playwright-mcp: failed to connect to CDP endpoint $CDP_ENDPOINT after $MCP_PLAYWRIGHT_RETRY_ATTEMPTS attempts" >&2
+  exit 1
+fi
+
 # kechangdev/browser-vnc binds Chromium CDP on 127.0.0.1:9222; it also host-checks HTTP requests.
-JSON="$(curl -sSf --connect-timeout 3 --max-time 10 -H 'Host: 127.0.0.1:9222' "\${CDP_ENDPOINT%/}/json/version")"
 WS_URL="$(printf "%s" "$JSON" | node -e 'const fs=require("fs"); const j=JSON.parse(fs.readFileSync(0,"utf8")); process.stdout.write(j.webSocketDebuggerUrl || "")')"
 if [[ -z "$WS_URL" ]]; then
   echo "docker-git-playwright-mcp: webSocketDebuggerUrl missing" >&2

packages/lib/tests/usecases/mcp-playwright.test.ts

@@ -120,6 +120,15 @@ describe("enableMcpPlaywrightProjectFiles", () => {
         const dockerfileAfter = yield* _(fs.readFileString(path.join(outDir, "Dockerfile")))
         expect(dockerfileAfter).toContain("@playwright/mcp")
 
+        // CHANGE: verify retry logic is included in docker-git-playwright-mcp wrapper
+        // WHY: issue-123 requires retry mechanism to handle browser sidecar startup delays
+        // QUOTE(issue-123): "Почему MCP сервер лежит с ошибкой?"
+        // REF: issue-123
+        expect(dockerfileAfter).toContain("MCP_PLAYWRIGHT_RETRY_ATTEMPTS")
+        expect(dockerfileAfter).toContain("MCP_PLAYWRIGHT_RETRY_DELAY")
+        expect(dockerfileAfter).toContain("fetch_cdp_version()")
+        expect(dockerfileAfter).toContain("waiting for browser sidecar")
+
         const browserDockerfileExists = yield* _(fs.exists(path.join(outDir, "Dockerfile.browser")))
         const startExtraExists = yield* _(fs.exists(path.join(outDir, "mcp-playwright-start-extra.sh")))
         expect(browserDockerfileExists).toBe(true)