Save a diagnosed error pattern after fixing a test failure. Extracts error signature, failing action, and URL from the test run. Deduplicates by pattern ID \u2014 re-saving increments confirmations.
AI agents use e2e_save_error_pattern to create or update resources in Playwright Autopilot — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Playwright Autopilot environment.
This tool creates and modifies error pattern records in a persistent store, enabling reversible write operations. While it has no destructive delete capability and doesn't execute arbitrary code or move money, it does persist diagnostic data that could be altered or accumulated.
From the tool's definition 'Save a diagnosed error pattern' — the tool creates or stores new error pattern records. The deduplication logic ('re-saving increments confirmations') indicates modification of existing data structures.
Documented attack patterns abuse exactly the kind of access e2e_save_error_pattern gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Playwright Autopilot, and nothing reaches the server without passing your rules. This is the rule we recommend for e2e_save_error_pattern:
{
"version": "1",
"default": "deny",
"tools": {
"e2e_save_error_pattern": {
"limits": [
{
"counter": "e2e_save_error_pattern_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}e2e_save_error_pattern stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Save a diagnosed error pattern after fixing a test failure. Extracts error signature, failing action, and URL from the test run. Deduplicates by pattern ID \u2014 re-saving increments confirmations. It is categorised as a Write tool in the Playwright Autopilot MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Playwright Autopilot MCP server in PolicyLayer and add a rule for e2e_save_error_pattern: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Playwright Autopilot. Nothing to install.
e2e_save_error_pattern is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the e2e_save_error_pattern rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for e2e_save_error_pattern. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
e2e_save_error_pattern is provided by the Playwright Autopilot MCP server (kaizen-yutani/playwright-autopilot). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Playwright Autopilot, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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