grafana-loki-logcli

name	grafana-loki-logcli
description	Query and explore logs in Grafana Loki via the logcli command-line tool. Use when a user asks to pull logs for analysis.
allowed-tools	Bash(logcli:*)

Grafana Loki LogCLI

The logcli is a command-line client for Grafana Loki that runs LogQL queries against a Loki instance.

Requirements: The logcli CLI must be pre-installed on the computer.

Instructions

When running "logcli query" always use -z UTC to request the UTC timezone of the output.

Pass the --output raw unless the use case requires jsonl.

When a user refers to a date or a range of dates, use the 2021-01-19T10:00:00Z format to pass the CLI. Always assume the time is UTC unless specified explicitly.

To request all available log entries pass the --limit 0. Consider pipe'ing or tee'ing the output to a temporal text file to run the analysis on the fetched data offline.

Examples

Run a LogQL query against the ops Loki instance:

logcli --addr=https://logs-ops-002.grafana-ops.net \
  --username=29 --password=`cat $HOME/.config/gcom/gcom-ops.token` \
  query '<query>'

The username "29" is the well-known "ops tenant". The API password for the tenant seats in the mentioned file.

Use the "ops" instance to pull logs for all non-dev workloads.

Run a LogQL query against the dev Loki instance:

logcli --addr=https://logs-dev-005.grafana-dev.net \
  --username=29 --password=`cat $HOME/.config/gcom/gcom-dev.token` \
  query '<query>'

Query all "info" level logs from the "compactor" container in the namespace "mimir-dev-14" between 8/10 00:00 and 9/10 00:00 (not inclusive). Request the output in the jsonl format:

logcli --addr=https://logs-dev-005.grafana-dev.net \
  --username=29 --password=$(cat $HOME/.config/gcom/gcom-dev.token) \
  query '{namespace="mimir-dev-14", container="compactor"} |= `level=info`' \
  --from '2025-10-08T00:00:00Z' --to '2025-10-09T00:00:00Z' -z UTC -o jsonl --limit 0

Reference

Run logcli help to read the reference. Running logcli help <command> shows the reference for a specific sub-command.

The complete online reference is available at https://grafana.com/docs/loki/latest/query/logcli/getting-started/