Log Viewer

Every run saves a .jsonl log file to logs/. The log captures every step: code generated, output produced, usage stats, and final results across all agents and sub-agents.

Stats (default)

Print a summary of any log file — no extra dependencies required:

fast-rlm-log logs/run_2026-02-23T20-33-30-936Z.jsonl

Output:

Log entries:  42
Total runs:   5
Root runs:    1
Max depth:    2
Total tokens: 45,230
Total cost:   $0.034521

Interactive TUI

For a full interactive viewer with code highlighting, step navigation, and reasoning traces:

fast-rlm-log logs/run_2026-02-23T20-33-30-936Z.jsonl --tui

Requires Bun

The TUI viewer is built with OpenTUI and requires Bun. Dependencies are installed automatically on first run.

TUI controls

Key	Action
Up / Down	Navigate steps in current run
Left / Right	Go to parent / child subagent
Tab / Shift+Tab	Next / previous sibling subagent
H / J	Scroll code panel up / down
K / L	Scroll output panel up / down
R	Toggle reasoning trace modal
O	Toggle final output modal
q / Ctrl+C	Quit

Programmatic access

The log file path is included in every run() result:

import fast_rlm

result = fast_rlm.run("What is 2+2?")
print(result["log_file"])  # e.g. "./logs/run_2026-02-23T20-33-30-936Z.jsonl"

The log is standard JSONL — each line is a JSON object you can parse with any tool.