list_apg_patterns

List the W3C APG pattern names available as entry points for get_apg_pattern (composite components). Native primitives are not listed here — reach those via get_aria_role / get_element_roles.

SERVERA11y Assist SOURCEa11y-assist-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/a11y-assist-mcp/list-apg-patterns.md

WHAT IT DOES

What list_apg_patterns does on A11y Assist

AI agents call list_apg_patterns to retrieve information from A11y Assist without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why list_apg_patterns is rated Low

Even though list_apg_patterns only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_apg_patterns safely

PolicyLayer is an MCP gateway: it sits between your AI agents and A11y Assist, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For list_apg_patterns, this is the rule to start with:

list_apg_patterns Allowed

list_apg_patterns is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_apg_patterns": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect A11y Assist, apply this rule, and every list_apg_patterns call is checked against it from then on.

FAQ

Questions about list_apg_patterns

What does the list_apg_patterns tool do? +

List the W3C APG pattern names available as entry points for get_apg_pattern (composite components). Native primitives are not listed here — reach those via get_aria_role / get_element_roles. It is categorised as a Read tool in the A11y Assist MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_apg_patterns? +

Register the A11y Assist MCP server in PolicyLayer and add a rule for list_apg_patterns: 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 A11y Assist. Nothing to install.

What risk level is list_apg_patterns? +

list_apg_patterns is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_apg_patterns? +

Yes. Add a rate_limit block to the list_apg_patterns 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.

How do I block list_apg_patterns completely? +

Set action: deny in the PolicyLayer policy for list_apg_patterns. 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.

What MCP server provides list_apg_patterns? +

list_apg_patterns is provided by the A11y Assist MCP server (a11y-assist-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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