Add an emoji reaction to a merge request, for example thumbsup, rocket, or eyes.
AI agents use gitlab_create_merge_request_emoji_reaction to create or update resources in Gitlab — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Gitlab environment.
Adding emoji reactions modifies state by creating a new reaction entry, making it a Write operation. The action is fully reversible (emoji reactions can be removed), has minimal blast radius, and does not execute code, delete data, or affect financial systems. Severity is low because the impact is cosmetic and limited to collaboration metadata.
From the tool's definition Tool name and description indicate it 'Add[s] an emoji reaction' to a merge request. This creates new metadata (emoji reactions) on an existing resource, which is reversible.
Documented attack patterns abuse exactly the kind of access gitlab_create_merge_request_emoji_reaction 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_create_merge_request_emoji_reaction:
{
"version": "1",
"default": "deny",
"tools": {
"gitlab_create_merge_request_emoji_reaction": {
"limits": [
{
"counter": "gitlab_create_merge_request_emoji_reaction_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}gitlab_create_merge_request_emoji_reaction 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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Add an emoji reaction to a merge request, for example thumbsup, rocket, or eyes. It is categorised as a Write tool in the Gitlab MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Gitlab MCP server in PolicyLayer and add a rule for gitlab_create_merge_request_emoji_reaction: 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_create_merge_request_emoji_reaction 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 gitlab_create_merge_request_emoji_reaction 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_create_merge_request_emoji_reaction. 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_create_merge_request_emoji_reaction 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.