Execute GraphQL mutation (disabled in read-only mode).
AI agents invoke gitlab_execute_graphql_mutation to trigger actions in Gitlab. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
GraphQL mutations are operations that modify data on the server. While the tool could theoretically execute any mutation depending on server-side permissions and the arguments provided, the capability to execute arbitrary mutations against a production GitLab instance represents a high-severity Execute risk.
From the tool's definition Tool name explicitly states 'execute' and 'graphql_mutation'; description indicates it executes mutations which by GraphQL definition modify server state. The parenthetical '(disabled in read-only mode)' confirms this tool performs write/modify operations.
Documented attack patterns abuse exactly the kind of access gitlab_execute_graphql_mutation gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Gitlab, and nothing reaches the server without passing your rules. This is the rule we recommend for gitlab_execute_graphql_mutation:
{
"version": "1",
"default": "deny",
"tools": {
"gitlab_execute_graphql_mutation": {
"limits": [
{
"counter": "gitlab_execute_graphql_mutation_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}gitlab_execute_graphql_mutation stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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Execute GraphQL mutation (disabled in read-only mode). It is categorised as a Execute tool in the Gitlab MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Gitlab MCP server in PolicyLayer and add a rule for gitlab_execute_graphql_mutation: 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. Nothing to install.
gitlab_execute_graphql_mutation is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the gitlab_execute_graphql_mutation 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_execute_graphql_mutation. 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_execute_graphql_mutation is provided by the Gitlab MCP server (mcpland/gitlab-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Gitlab, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
190 Gitlab tools catalogued and risk-classified — across an index of 43,000+ MCP servers.