snapshot_graph_metrics

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/snapshot-graph-metrics.md

WHAT IT DOES

What snapshot_graph_metrics does on Meridian

AI agents use snapshot_graph_metrics 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
`project_id`	string	—
`session_id`	string	Yes
`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 snapshot_graph_metrics is rated Medium

This tool writes/records snapshot metrics to persistent storage (SQLite/Postgres or hosted service). It creates a new data record at session start/end for later diff comparisons. There is no deletion, execution of code, or financial action involved. The blast radius is low — misuse could pollute graph history with incorrect metrics but is reversible via deletion controls mentioned in the description.

From the tool's definition Record a code-graph snapshot for a session (node count, edge count, hotspot count, file churn)... supplied text and project/session metadata are sent to and stored in Meridian's service

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs snapshot_graph_metrics 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 snapshot_graph_metrics, this is the rule to start with:

snapshot_graph_metrics Rate-limited

snapshot_graph_metrics 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": {
    "snapshot_graph_metrics": {
      "limits": [
        {
          "counter": "snapshot_graph_metrics_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 snapshot_graph_metrics call is checked against it from then on.

FAQ

Questions about snapshot_graph_metrics

What does the snapshot_graph_metrics tool do? +

[MAINTENANCE] Record a code-graph snapshot for a session (node count, edge count, hotspot count, file churn). Call at session start and end to enable get_graph_diff comparisons. 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 snapshot_graph_metrics accept? +

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

How do I enforce a policy on snapshot_graph_metrics? +

Register the Meridian MCP server in PolicyLayer and add a rule for snapshot_graph_metrics: 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 snapshot_graph_metrics? +

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

Can I rate-limit snapshot_graph_metrics? +

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

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

snapshot_graph_metrics 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.

KEEP EXPLORING

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save_snapshot on Why Did You Render → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →