set_north_star

SERVERMeridian SOURCE@meridianmcp/mcp

Medium RISK CLASS

Category Write

Parameters 31 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-ajc3xc-meridian/set-north-star.md

WHAT IT DOES

What set_north_star does on Meridian

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

Parameter	Type	Required	Description
`north_star`	string	Yes
`project_id`	string	—
`project_name`	string	—	Project name — an alternative to project_id; resolved to the id internally. project_id wins if both are given.

Parameters from the server's own tool schema.

RISK

Why set_north_star is rated Medium

This tool creates or modifies data reversibly: it updates the north star (a product vision artifact) in the persistent memory system. The operation is Write-category because it modifies existing data rather than creating irreversible deletions, executing arbitrary code, or moving financial resources.

From the tool's definition Tool description states "Update only the north star" — a direct modification action. The description explicitly notes that "supplied text and project/session metadata are sent to and stored in Meridian's service" and are "visible in the dashboard/API and…

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_north_star safely

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

set_north_star Rate-limited

set_north_star 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": {
    "set_north_star": {
      "limits": [
        {
          "counter": "set_north_star_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 Meridian, apply this rule, and every set_north_star call is checked against it from then on.

FAQ

Questions about set_north_star

What does the set_north_star tool do? +

[MAINTENANCE] Update only the north star — the long-lived product vision that rarely changes. Distinct from the version goal (set_goal). Any team member can call this. Persistent-state disclosure: on hosted Meridian, supplied text and project/session metadata are sent to and stored in Meridian's service; self-hosted deployments keep them in the configured local SQLite/Postgres database. This data is visible in the dashboard/API and later project context or handoffs. Delete individual tasks, notes, or decisions where supported, or delete the project/account using the documented controls. Do not include secrets. It is categorised as a Write tool in the Meridian MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does set_north_star accept? +

set_north_star accepts 3 parameters: north_star, project_id, project_name. Required: north_star. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on set_north_star? +

Register the Meridian MCP server in PolicyLayer and add a rule for set_north_star: 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 Meridian. Nothing to install.

What risk level is set_north_star? +

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

Can I rate-limit set_north_star? +

Yes. Add a rate_limit block to the set_north_star 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 set_north_star completely? +

Set action: deny in the PolicyLayer policy for set_north_star. 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 set_north_star? +

set_north_star is provided by the Meridian MCP server (@meridianmcp/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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