AI agents use claude_code_add_workspace_member to create or update resources in Sage MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Sage MCP environment.
The tool creates or modifies workspace membership by adding users to a workspace. This is a Write-category action: it creates a new permission grant or modifies access control lists, which is reversible (users can be removed later). It does not execute arbitrary code, delete data irreversibly, or move money.
From the tool's definition Tool name 'add_workspace_member' and description 'Add a member to a workspace' indicate creation/modification of workspace membership state. This is a reversible write operation (members can be removed).
Documented attack patterns abuse exactly the kind of access claude_code_add_workspace_member gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Sage MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for claude_code_add_workspace_member:
{
"version": "1",
"default": "deny",
"tools": {
"claude_code_add_workspace_member": {
"limits": [
{
"counter": "claude_code_add_workspace_member_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}claude_code_add_workspace_member 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 member to a workspace. It is categorised as a Write tool in the Sage MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Sage MCP server in PolicyLayer and add a rule for claude_code_add_workspace_member: 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 Sage MCP. Nothing to install.
claude_code_add_workspace_member 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 claude_code_add_workspace_member 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 claude_code_add_workspace_member. 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.
claude_code_add_workspace_member is provided by the Sage MCP server (sagemcp/sagemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 359 Sage MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
359 Sage MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.