addWorkspaceMember

Add an existing organisation member to a workspace with a workspace-level role. Idempotent — returns the existing membership if already a member. Caller must be a workspace owner or admin.

SERVERStable Baseline SOURCEhttps://api.stablebaseline.io/functions/v1/cloud-serve/mcp

Medium RISK CLASS

Category Write

Parameters 33 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-stablebaseline-sb/addworkspacemember.md

WHAT IT DOES

What addWorkspaceMember does on Stable Baseline

AI agents use addWorkspaceMember to create or update resources in Stable Baseline, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Stable Baseline environment.

Parameter	Type	Required	Description
`user_id`	string	Yes	Must already be an active organisation member.
`workspace_id`	string	Yes
`workspace_role`	string	Yes

Parameters from the server's own tool schema.

RISK

Why addWorkspaceMember is rated Medium

This tool creates or modifies workspace membership and role assignments, making it a Write action. It is reversible (a member can be removed), so it does not qualify as Destructive.

From the tool's definition 'Add an existing organisation member to a workspace with a workspace-level role' — creates a new membership record or modifies workspace access. The description explicitly mentions role assignment, which is a reversible state change.

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs addWorkspaceMember safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Stable Baseline, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For addWorkspaceMember, this is the rule to start with:

addWorkspaceMember Rate-limited

addWorkspaceMember 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "addWorkspaceMember": {
      "limits": [
        {
          "counter": "addworkspacemember_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Stable Baseline, apply this rule, and every addWorkspaceMember call is checked against it from then on.

FAQ

Questions about addWorkspaceMember

What does the addWorkspaceMember tool do? +

Add an existing organisation member to a workspace with a workspace-level role. Idempotent — returns the existing membership if already a member. Caller must be a workspace owner or admin. It is categorised as a Write tool in the Stable Baseline MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does addWorkspaceMember accept? +

addWorkspaceMember accepts 3 parameters: user_id, workspace_id, workspace_role. Required: user_id, workspace_id, workspace_role. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on addWorkspaceMember? +

Register the Stable Baseline MCP server in PolicyLayer and add a rule for addWorkspaceMember: 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 Stable Baseline. Nothing to install.

What risk level is addWorkspaceMember? +

addWorkspaceMember is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit addWorkspaceMember? +

Yes. Add a rate_limit block to the addWorkspaceMember 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.

How do I block addWorkspaceMember completely? +

Set action: deny in the PolicyLayer policy for addWorkspaceMember. 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.

What MCP server provides addWorkspaceMember? +

addWorkspaceMember is provided by the Stable Baseline MCP server (https://api.stablebaseline.io/functions/v1/cloud-serve/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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