Add a comment to a JIRA ticket
AI agents use add-comment to create or update resources in JIRA MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your JIRA MCP environment.
Adding a comment creates new content that can be edited or deleted later, making it a Write rather than Read operation. Severity is medium because misuse could spam tickets, create noise in project tracking, or add misleading information to tickets that teams rely on for coordination and decisions, but the effect is reversible and limited in blast radius compared to destructive operations.
From the tool's definition Tool description states 'Add a comment to a JIRA ticket', which creates new data (a comment) within an existing ticket. This is a write operation that modifies ticket state reversibly.
Documented attack patterns abuse exactly the kind of access add-comment gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and JIRA MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for add-comment:
{
"version": "1",
"default": "deny",
"tools": {
"add-comment": {
"limits": [
{
"counter": "add-comment_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add-comment 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 a comment to a JIRA ticket. It is categorised as a Write tool in the JIRA MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the JIRA MCP server in PolicyLayer and add a rule for add-comment: 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 JIRA MCP. Nothing to install.
add-comment 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 add-comment 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 add-comment. 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.
add-comment is provided by the JIRA MCP server (mankowskinick/jira-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from JIRA MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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14 JIRA MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.