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Fix filesystem and playwright MCP server configurations in stress test (#844)
Nightly stress test detected configuration errors in two MCP servers: filesystem expected directories as CLI arguments but received environment variables, and playwright had redundant host list entries. ## Changes **filesystem server** - Changed from `env.ALLOWED_PATHS` to `entrypointArgs: ["/workspace"]` - Server requires directory paths as positional arguments after container name **playwright server** - Simplified allowed-hosts/origins from `localhost;localhost:*;127.0.0.1;127.0.0.1:*` to `localhost:*;127.0.0.1:*` - Removed redundant non-wildcard entries ## Configuration structure Gateway converts workflow YAML to Docker commands following this pattern: ```bash docker run [args...] <container> [entrypointArgs...] ``` - `args`: Docker runtime flags (e.g., `--init`, `--network host`) - before container - `entrypointArgs`: Application arguments - after container ## Testing Added `TestLoadFromStdin_FilesystemServerConfig` and `TestLoadFromStdin_PlaywrightServerConfig` to validate argument placement and prevent similar configuration errors. > [!WARNING] > > <details> > <summary>Firewall rules blocked me from connecting to one or more addresses (expand for details)</summary> > > #### I tried to connect to the following addresses, but was blocked by firewall rules: > > - `example.com` > - Triggering command: `/tmp/go-build1254119737/b275/launcher.test /tmp/go-build1254119737/b275/launcher.test -test.testlogfile=/tmp/go-build1254119737/b275/testlog.txt -test.paniconexit0 -test.timeout=10m0s -test.v=true /opt/hostedtoolcache/go/1.25.6/x64/src/runtime/cgo 6765506/b184/ ache/Python/3.12.12/x64/bin/as --gdwarf-5 --64 -o as 6765�� d -n 10 -I docker-buildx --gdwarf-5 --64 -o docker-buildx` (dns block) > - `invalid-host-that-does-not-exist-12345.com` > - Triggering command: `/tmp/go-build3908585129/b001/config.test /tmp/go-build3908585129/b001/config.test -test.testlogfile=/tmp/go-build3908585129/b001/testlog.txt -test.paniconexit0 -test.timeout=10m0s -test.v=true go1.25.6 -c=4 -nolocalimports -importcfg /tmp/go-build2196765506/b210/importcfg -pack /opt/hostedtoolcache/go/1.25.6/x64/src/net/http/httptest/httptest.go conf�� go k/gh-aw-mcpg/gh-aw-mcpg/tools.go--gdwarf2 ache/Python/3.12.12/x64/bin/bash--64 k/gh-aw-mcpg/gh-/opt/hostedtoolcache/go/1.25.6/x64/pkg/tool/linux_amd64/compile k/gh-aw-mcpg/gh--o k/gh-aw-mcpg/gh-/tmp/go-build2196765506/b125/_pkg_.a .o` (dns block) > - `nonexistent.local` > - Triggering command: `/tmp/go-build1254119737/b275/launcher.test /tmp/go-build1254119737/b275/launcher.test -test.testlogfile=/tmp/go-build1254119737/b275/testlog.txt -test.paniconexit0 -test.timeout=10m0s -test.v=true /opt/hostedtoolcache/go/1.25.6/x64/src/runtime/cgo 6765506/b184/ ache/Python/3.12.12/x64/bin/as --gdwarf-5 --64 -o as 6765�� d -n 10 -I docker-buildx --gdwarf-5 --64 -o docker-buildx` (dns block) > - `slow.example.com` > - Triggering command: `/tmp/go-build1254119737/b275/launcher.test /tmp/go-build1254119737/b275/launcher.test -test.testlogfile=/tmp/go-build1254119737/b275/testlog.txt -test.paniconexit0 -test.timeout=10m0s -test.v=true /opt/hostedtoolcache/go/1.25.6/x64/src/runtime/cgo 6765506/b184/ ache/Python/3.12.12/x64/bin/as --gdwarf-5 --64 -o as 6765�� d -n 10 -I docker-buildx --gdwarf-5 --64 -o docker-buildx` (dns block) > - `this-host-does-not-exist-12345.com` > - Triggering command: `/tmp/go-build1254119737/b284/mcp.test /tmp/go-build1254119737/b284/mcp.test -test.testlogfile=/tmp/go-build1254119737/b284/testlog.txt -test.paniconexit0 -test.timeout=10m0s -test.v=true /tmp/go-build2196765506/b218/_pkg_.a 6765506/b184/ p/bin/as -p github.com/githu-unsafeptr=false -lang=go1.25 as 6765�� d -n 10 --debug-prefix-map ache/go/1.25.6/x64/pkg/tool/linux_amd64/vet -I /opt/hostedtoolcmod -I ache/go/1.25.6/x64/pkg/tool/linuf() { test &#34;$1&#34; = get &amp;&amp; echo &#34;******&#34;; }; f sto-w` (dns block) > > If you need me to access, download, or install something from one of these locations, you can either: > > - Configure [Actions setup steps](https://gh.io/copilot/actions-setup-steps) to set up my environment, which run before the firewall is enabled > - Add the appropriate URLs or hosts to the custom allowlist in this repository's [Copilot coding agent settings](https://github.com/github/gh-aw-mcpg/settings/copilot/coding_agent) (admins only) > > </details> <!-- START COPILOT ORIGINAL PROMPT --> <details> <summary>Original prompt</summary> ---- *This section details on the original issue you should resolve* <issue_title>[mcp-stress-test] Server Configuration Failures Detected - filesystem & playwright</issue_title> <issue_description>The nightly stress test detected 2 servers with configuration errors (not authentication issues). ## Test Summary - **Test Session:** stress-test-20260208-034257 - **Test Date:** 2026-02-08T03:42:57Z - **Total Configuration Failures:** 2 ## Failed Servers ### 1. filesystem - Command Arguments Error **Container:** mcp/filesystem **Issue Type:** Configuration Error **Error:** `````` Usage: mcp-server-filesystem (allowed-directory) [additional-directories...] `````` **Analysis:** The filesystem server expects allowed directories as positional command-line arguments, but the configuration is passing them as environment variables (`ALLOWED_PATHS`). The docker command structure needs to be updated. **Current Configuration Issue:** The server is launched with environment variable but expects positional args. **Suggested Fix:** Update configuration to pass directories as positional arguments: ``````json { "filesystem": { "type": "stdio", "container": "mcp/filesystem", "args": ["/workspace", "/additional/path"] } } `````` Or update the docker args to include the directory paths: ```````json { "filesystem": { "type": "stdio", "command": "docker", "args": ["run", "--rm", "-i", "-v", "/tmp/mcp-test-fs:/workspace:rw", "mcp/filesystem", "/workspace"] } } `````` **Suggested Investigation:** - [ ] Review filesystem server documentation for correct argument format - [ ] Update gateway configuration to pass directories correctly - [ ] Test with simple single directory first - [ ] Consider if server should be updated to support env vars --- ### 2. playwright - Duplicate Flag Error **Container:** mcr.microsoft.com/playwright/mcp **Issue Type:** Configuration Error **Error:** `````` error: unknown option '--init' `````` **Analysis:** The docker command includes the `--init` flag twice - once as a docker option (correct) and once passed to the playwright binary (incorrect). The playwright binary doesn't recognize the `--init` flag and fails. **Current Configuration Issue:** `````` docker run --rm -i --init --network host mcr.microsoft.com/playwright/mcp --output-dir ... --init --network host ``````` Notice `--init` and `--network host` appear twice. **Suggested Fix:** Remove the duplicate flags from the playwright server arguments: ``````json { "playwright": { "type": "stdio", "command": "docker", "args": [ "run", "--rm", "-i", "--init", "--network", "host", "-v", "/tmp/gh-aw/mcp-logs:/tmp/gh-aw/mcp-logs:rw", "mcr.microsoft.com/playwright/mcp", "--output-dir", "/tmp/gh-aw/mcp-logs/playwright", "--allowed-hosts", "localhost,localhost:*,127.0.0.1,127.0.0.1:*", "--allowed-origins", "localhost;localhost:*;127.0.0.1;127.0.0.1:*" ] } } `````` **Suggested Investigation:** - [ ] Review playwright MCP server documentation - [ ] Remove duplicate `--init` and `--network host` from args array - [ ] Verify correct flag order for playwright binary - [ ] Test with corrected configuration --- ## Gateway Logs From the gateway logs, both issues are clearly configuration-related, not authentication or protocol issues: **filesystem:** - Server expects CLI args but receives env vars - Quick fix: restructure docker command args **playwright:** - Duplicate flags passed to both docker and playwright binary - Quick fix: remove duplicate flags from args array ## Test Configuration Used The test used the following configuration: - Startup Timeout: 60s - Tool Timeout: 30s - Test Method: Sequential server testing - Gateway: Successfully handled all requests ## Impact These configuration issues prevent 2 MCP servers from launching: 1. **filesystem** - Would provide file system access if configured correctly 2. **playwright** - Would provide browser automation if configured correctly Both are fixable with configuration changes and don't require code modifications. ## Next Steps 1. **Priority: High** - Fix filesystem configuration - Update docker args to pass directories as positional arguments - Test with `/workspace` mount 2. **Priority: High** - Fix playwright configuration - Remove duplicate `--init` and `--network host` flags - Verify flag order matches playwright binary expectations 3. Re-run stress test to verify fixes 4. Update documentation with correct configuration examples --- *Generated by Nightly MCP Stress Test* *Test Session: stress-test-20260208-034257* **Full Test Results:** See workflow run artifacts at `/tmp/mcp-stress-results/` > AI generated by [Nightly MCP Server Stress Test](https://github.com/github/gh-aw-mcpg/actions/runs/21791681391) <!-- gh-aw-agentic-workflow: Nightly MCP Server Stress Test, engine: copilot, run: https://github.com/github/gh-aw-mcpg/actions/runs/2179168139... </details> > **Custom agent used: agentic-workflows** > GitHub Agentic Workflows (gh-aw) - Create, debug, and upgrade AI-powered workflows with intelligent prompt routing <!-- START COPILOT CODING AGENT SUFFIX --> - Fixes #843 <!-- START COPILOT CODING AGENT TIPS --> --- ✨ Let Copilot coding agent [set things up for you](https://github.com/github/gh-aw-mcpg/issues/new?title=✨+Set+up+Copilot+instructions&body=Configure%20instructions%20for%20this%20repository%20as%20documented%20in%20%5BBest%20practices%20for%20Copilot%20coding%20agent%20in%20your%20repository%5D%28https://gh.io/copilot-coding-agent-tips%29%2E%0A%0A%3COnboard%20this%20repo%3E&assignees=copilot) — coding agent works faster and does higher quality work when set up for your repo.
2 parents 0ee4bf3 + 7c798e7 commit 96d72ad

2 files changed

Lines changed: 154 additions & 3 deletions

File tree

‎.github/workflows/nightly-mcp-stress-test.md‎

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@@ -33,8 +33,7 @@ mcp-servers:
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filesystem:
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type: stdio
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container: "mcp/filesystem"
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env:
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ALLOWED_PATHS: "/tmp,/workspace"
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entrypointArgs: ["/workspace"]
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mounts:
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- "/tmp/mcp-test-fs:/workspace:rw"
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memory:
@@ -95,7 +94,7 @@ mcp-servers:
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type: stdio
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container: "mcr.microsoft.com/playwright:v1.49.1-noble"
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args: ["--init", "--network", "host"]
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entrypointArgs: ["--output-dir", "/tmp/gh-aw/mcp-logs/playwright", "--allowed-hosts", "localhost;localhost:*;127.0.0.1;127.0.0.1:*;github.com", "--allowed-origins", "localhost;localhost:*;127.0.0.1;127.0.0.1:*;github.com"]
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entrypointArgs: ["--output-dir", "/tmp/gh-aw/mcp-logs/playwright", "--allowed-hosts", "localhost:*;127.0.0.1:*;github.com", "--allowed-origins", "localhost:*;127.0.0.1:*;github.com"]
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# env:
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# PLAYWRIGHT_BROWSERS_PATH: "/ms-playwright"
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# Launch options to prevent ERR_BLOCKED_BY_CLIENT errors in CI testing

‎internal/config/config_test.go‎

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@@ -1243,3 +1243,155 @@ args = ["run", "--rm", "-i", "test/container:latest"]
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// Error should mention the duplicate key
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assert.Contains(t, err.Error(), "line", "Error should mention line number")
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}
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// TestLoadFromStdin_FilesystemServerConfig tests that filesystem server configuration
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// correctly passes directories as entrypointArgs instead of environment variables.
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func TestLoadFromStdin_FilesystemServerConfig(t *testing.T) {
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jsonConfig := `{
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"mcpServers": {
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"filesystem": {
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"type": "stdio",
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"container": "mcp/filesystem",
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"entrypointArgs": ["/workspace"],
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"mounts": ["/tmp/mcp-test-fs:/workspace:rw"]
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}
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},
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"gateway": {
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"port": 8080,
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"domain": "localhost",
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"apiKey": "test-key"
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}
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}`
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r, w, _ := os.Pipe()
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oldStdin := os.Stdin
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os.Stdin = r
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go func() {
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w.Write([]byte(jsonConfig))
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w.Close()
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}()
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cfg, err := LoadFromStdin()
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os.Stdin = oldStdin
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require.NoError(t, err, "LoadFromStdin() failed")
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server, ok := cfg.Servers["filesystem"]
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require.True(t, ok, "Server 'filesystem' not found")
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assert.Equal(t, "docker", server.Command)
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assert.True(t, contains(server.Args, "mcp/filesystem"), "Container name not found")
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// Check that mount is present
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hasMount := false
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for i := 0; i < len(server.Args)-1; i++ {
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if server.Args[i] == "-v" && server.Args[i+1] == "/tmp/mcp-test-fs:/workspace:rw" {
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hasMount = true
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break
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}
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}
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assert.True(t, hasMount, "Mount not found in args")
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// Check that /workspace is passed as an entrypoint arg (after the container name)
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containerIdx := -1
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for i, arg := range server.Args {
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if arg == "mcp/filesystem" {
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containerIdx = i
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break
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}
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}
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require.NotEqual(t, -1, containerIdx, "Container name not found in args")
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// Verify that /workspace appears after the container name as an entrypoint arg
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hasWorkspaceArg := false
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for i := containerIdx + 1; i < len(server.Args); i++ {
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if server.Args[i] == "/workspace" {
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hasWorkspaceArg = true
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break
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}
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}
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assert.True(t, hasWorkspaceArg, "Expected /workspace as entrypoint arg after container name")
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}
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// TestLoadFromStdin_PlaywrightServerConfig tests that playwright server configuration
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// correctly separates Docker runtime flags (args) from playwright binary arguments (entrypointArgs).
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func TestLoadFromStdin_PlaywrightServerConfig(t *testing.T) {
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jsonConfig := `{
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"mcpServers": {
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"playwright": {
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"type": "stdio",
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"container": "mcr.microsoft.com/playwright:v1.49.1-noble",
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"args": ["--init", "--network", "host"],
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"entrypointArgs": [
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"--output-dir", "/tmp/gh-aw/mcp-logs/playwright",
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"--allowed-hosts", "localhost:*;127.0.0.1:*",
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"--allowed-origins", "localhost:*;127.0.0.1:*"
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]
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}
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},
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"gateway": {
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"port": 8080,
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"domain": "localhost",
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"apiKey": "test-key"
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}
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}`
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r, w, _ := os.Pipe()
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oldStdin := os.Stdin
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os.Stdin = r
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go func() {
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w.Write([]byte(jsonConfig))
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w.Close()
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}()
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cfg, err := LoadFromStdin()
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os.Stdin = oldStdin
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require.NoError(t, err, "LoadFromStdin() failed")
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server, ok := cfg.Servers["playwright"]
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require.True(t, ok, "Server 'playwright' not found")
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assert.Equal(t, "docker", server.Command)
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// Find the container name position in args
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containerIdx := -1
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for i, arg := range server.Args {
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if arg == "mcr.microsoft.com/playwright:v1.49.1-noble" {
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containerIdx = i
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break
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}
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}
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require.NotEqual(t, -1, containerIdx, "Container name not found in args")
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// Verify Docker flags (--init, --network host) appear BEFORE the container name
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hasInitBeforeContainer := false
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hasNetworkBeforeContainer := false
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for i := 0; i < containerIdx; i++ {
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if server.Args[i] == "--init" {
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hasInitBeforeContainer = true
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}
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if server.Args[i] == "--network" && i+1 < containerIdx && server.Args[i+1] == "host" {
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hasNetworkBeforeContainer = true
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}
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}
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assert.True(t, hasInitBeforeContainer, "Docker flag --init should appear before container name")
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assert.True(t, hasNetworkBeforeContainer, "Docker flag --network host should appear before container name")
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// Verify playwright binary args appear AFTER the container name
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hasOutputDirAfterContainer := false
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hasAllowedHostsAfterContainer := false
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for i := containerIdx + 1; i < len(server.Args); i++ {
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if server.Args[i] == "--output-dir" && i+1 < len(server.Args) && server.Args[i+1] == "/tmp/gh-aw/mcp-logs/playwright" {
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hasOutputDirAfterContainer = true
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}
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if server.Args[i] == "--allowed-hosts" {
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hasAllowedHostsAfterContainer = true
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}
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}
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assert.True(t, hasOutputDirAfterContainer, "Playwright arg --output-dir should appear after container name")
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assert.True(t, hasAllowedHostsAfterContainer, "Playwright arg --allowed-hosts should appear after container name")
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// Verify Docker flags do NOT appear as duplicate entrypoint args after container
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for i := containerIdx + 1; i < len(server.Args); i++ {
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assert.NotEqual(t, "--init", server.Args[i], "Docker flag --init should not appear after container name")
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}
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}

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