playwright-mcp-skill

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Run browser automation through @playwright/mcp over UXC stdio MCP, with daemon-friendly session reuse and safe action guardrails. Use when tasks need deterministic page navigation, DOM snapshots, and scripted browser interaction from CLI.

11installs

Sourceholon-run/uxc

Added on2026-03-29

NPX Install

npx skill4agent add holon-run/uxc playwright-mcp-skill

SKILL.md Content

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Playwright MCP Skill

Use this skill to run Playwright MCP operations through

uxc

using fixed stdio endpoints.

Reuse the

uxc

skill for generic protocol discovery, auth/error handling, and envelope parsing rules.

Prerequisites

```
uxc
```
is installed and available in
```
PATH
```
.
```
npx
```
is available in
```
PATH
```
(Node.js installed).
Network access for first-time
```
@playwright/mcp
```
package fetch.
Browser runtime can start locally (headless mode is default in this skill).

Core Workflow (Playwright-Specific)

Endpoint candidate inputs before finalizing:

Raw package form from docs:
```
npx @playwright/mcp@latest
```
Reliable non-interactive form:
```
npx -y @playwright/mcp@latest
```

Isolated/headless stable form (default for this skill):

npx -y @playwright/mcp@latest --headless --isolated

Shared-profile headless form (for persistent login state):

npx -y @playwright/mcp@latest --headless --user-data-dir ~/.uxc/playwright-profile

Shared-profile headed form (for interactive debug with same login state):

npx -y @playwright/mcp@latest --user-data-dir ~/.uxc/playwright-profile

Verify protocol/path from official source and probe:
- Official source:
```
https://github.com/microsoft/playwright-mcp
```
- probe candidate endpoints with:
  - uxc "npx -y @playwright/mcp@latest --headless --isolated" -h
- Confirm protocol is MCP stdio (
```
protocol == "mcp"
```
  in envelope).
Detect auth requirement explicitly:
- Run host help or a minimal read call and inspect envelope.
- ```
@playwright/mcp
```
  default flow is no OAuth/API key for local stdio use.

Use fixed link command by default:

```
command -v playwright-mcp-cli
```

If missing, create it:

uxc link playwright-mcp-cli "npx -y @playwright/mcp@latest --headless --isolated"

Optional shared-profile dual command setup for persistent sessions:

```
command -v playwright-mcp-headless
```
```
command -v playwright-mcp-ui
```

uxc link --daemon-exclusive ~/.uxc/playwright-profile playwright-mcp-headless "npx -y @playwright/mcp@latest --headless --user-data-dir ~/.uxc/playwright-profile"

uxc link --daemon-exclusive ~/.uxc/playwright-profile playwright-mcp-ui "npx -y @playwright/mcp@latest --user-data-dir ~/.uxc/playwright-profile"

```
playwright-mcp-cli -h
```
If command conflict is detected and cannot be safely reused, stop and ask skill maintainers to pick another fixed command name.

Inspect operation schema before execution:

```
playwright-mcp-cli browser_navigate -h
```
```
playwright-mcp-cli browser_snapshot -h
```
```
playwright-mcp-cli browser_click -h
```

Prefer read-first interaction:
- Start with navigation/snapshot before mutating page state.
Execute actions with explicit confirmation when impact is high:
- Confirm before form submission, checkout, delete/destructive actions, or irreversible multi-step flows.

Guardrails

Keep automation on JSON output envelope; do not rely on
```
--text
```
.
Parse stable fields first:
```
ok
```
,
```
kind
```
,
```
protocol
```
,
```
data
```
,
```
error
```
.
Use
```
playwright-mcp-cli
```
as default command path.

playwright-mcp-cli <operation> ...

is equivalent to

uxc "npx -y @playwright/mcp@latest --headless --isolated" <operation> ...

Use direct
```
uxc "<endpoint>" ...
```
only as temporary fallback when link setup is unavailable.
If browser profile conflict appears, keep
```
--isolated
```
in endpoint and retry via the same fixed link command.
When using shared
```
--user-data-dir
```
, run headless/headed links serially (not concurrently).
To enable seamless switching between headed UI login and headless CLI automation using the same profile directory, set a daemon exclusive key:
- Prefer link-level setup (recommended above), or set
```
UXC_DAEMON_EXCLUSIVE=~/.uxc/playwright-profile
```
  for ad-hoc runs.
- If the profile is still busy (another session is actively running), fallback:
```
uxc daemon stop
```
Prefer
```
browser_snapshot
```
over screenshots for model-action loops.

References

Invocation patterns:
- ```
references/usage-patterns.md
```