# list_prometheus_label_values

Get the values for a specific label name in Prometheus. Allows filtering by series selectors and time range.

Agent View of the PolicyLayer registry record for `list_prometheus_label_values`. HTML page: https://policylayer.com/tools/0xteamhq-mcp-grafana/list-prometheus-label-values

## Facts

- Tool: `list_prometheus_label_values`
- Server: Grafana MCP Server (`0xteamhq/mcp-grafana`) — https://policylayer.com/tools/0xteamhq-mcp-grafana.md
- Homepage: https://github.com/0xteamhq/mcp-grafana
- Risk category: Read (Low risk)
- Registry record: grade C, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "list_prometheus_label_values",
    "arguments": {}
  }
}
```

## Why list_prometheus_label_values is rated Low

This tool retrieves metadata about Prometheus labels—label values are enumerated from existing metrics. It performs no writes, deletions, code execution, or financial operations. The blast radius of misuse is minimal: an agent might enumerate unnecessary label values or exhaust rate limits, but cannot alter monitoring data or trigger external actions. This is a straightforward read operation on observability data.

From the tool's own definition: "Tool name 'list_prometheus_label_values' and description 'Get the values for a specific label name in Prometheus' indicate data retrieval with no modification."

## Use case

AI agents call list_prometheus_label_values to retrieve information from Grafana MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Grafana MCP Server:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_prometheus_label_values": {}
  }
}
```

## Other tools on Grafana MCP Server (42)

- `query_loki_logs` — Execute — https://policylayer.com/tools/0xteamhq-mcp-grafana/query-loki-logs.md
- `fetch_pyroscope_profile` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/fetch-pyroscope-profile.md
- `find_error_pattern_logs` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/find-error-pattern-logs.md
- `find_slow_requests` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/find-slow-requests.md
- `generate_deeplink` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/generate-deeplink.md
- `get_alert_rule_by_uid` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/get-alert-rule-by-uid.md
- `get_assertions` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/get-assertions.md
- `get_current_oncall_users` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/get-current-oncall-users.md
- `get_dashboard_by_uid` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/get-dashboard-by-uid.md
- `get_dashboard_panel_queries` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/get-dashboard-panel-queries.md
- `get_dashboard_property` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/get-dashboard-property.md
- `get_dashboard_summary` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/get-dashboard-summary.md
- `get_datasource_by_name` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/get-datasource-by-name.md
- `get_datasource_by_uid` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/get-datasource-by-uid.md
- `get_incident` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/get-incident.md
- `get_oncall_shift` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/get-oncall-shift.md
- `get_sift_analysis` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/get-sift-analysis.md
- `get_sift_investigation` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/get-sift-investigation.md
- `list_alert_rules` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/list-alert-rules.md
- `list_contact_points` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/list-contact-points.md
- `list_datasources` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/list-datasources.md
- `list_incidents` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/list-incidents.md
- `list_loki_label_names` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/list-loki-label-names.md
- `list_loki_label_values` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/list-loki-label-values.md
- `list_oncall_schedules` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/list-oncall-schedules.md
- `list_oncall_teams` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/list-oncall-teams.md
- `list_oncall_users` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/list-oncall-users.md
- `list_prometheus_label_names` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/list-prometheus-label-names.md
- `list_prometheus_metric_metadata` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/list-prometheus-metric-metadata.md
- `list_prometheus_metric_names` — Read — https://policylayer.com/tools/0xteamhq-mcp-grafana/list-prometheus-metric-names.md
- …and 12 more: https://policylayer.com/tools/0xteamhq-mcp-grafana.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=0xteamhq-mcp-grafana · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/0xteamhq-mcp-grafana