AI agents call gitlab_discover_graphql_schema to retrieve information from Gitlab Api without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Schema discovery/introspection is a read-only operation that retrieves metadata about the GraphQL API structure. No side effects are expected. Confidence is reduced because the description is empty, but the name strongly implies a read/introspect operation.
From the tool's definition Tool name: 'gitlab_discover_graphql_schema' — 'discover' and 'schema' suggest introspection/querying of the GraphQL schema structure.
Documented attack patterns abuse exactly the kind of access gitlab_discover_graphql_schema gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Gitlab Api, and nothing reaches the server without passing your rules. This is the rule we recommend for gitlab_discover_graphql_schema:
{
"version": "1",
"default": "deny",
"tools": {
"gitlab_discover_graphql_schema": {}
}
}gitlab_discover_graphql_schema is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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gitlab_discover_graphql_schema. It is categorised as a Read tool in the Gitlab Api MCP Server, which means it retrieves data without modifying state.
Register the Gitlab Api MCP server in PolicyLayer and add a rule for gitlab_discover_graphql_schema: 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 Gitlab Api. Nothing to install.
gitlab_discover_graphql_schema is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the gitlab_discover_graphql_schema 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 gitlab_discover_graphql_schema. 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.
gitlab_discover_graphql_schema is provided by the Gitlab Api MCP server (knuckles-team/gitlab-api). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Gitlab Api, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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26 Gitlab Api tools catalogued and risk-classified — across an index of 43,000+ MCP servers.