Claude Session Logger

A local MCP server that keeps a running log of what you accomplish across Claude sessions. Each task you complete gets recorded to a daily JSONL file, and substantial work is automatically promoted to a cumulative weekly worklog — giving you a persistent, searchable record of your AI-assisted productivity.

Why

Claude conversations are ephemeral. You finish a session, close the window, and the work you did fades into chat history. This server solves that by giving Claude a set of tools to log tasks as they happen. At the end of a week you have a clean Markdown summary of the important things you shipped, without the noise of minor fixes and formatting tweaks.

Features

• Daily task logs — JSONL files with one entry per completed task, including summary, detail notes, tags, project name, status, and estimated duration.
• Weekly worklog — A cumulative Markdown file (Monday–Sunday) that automatically captures substantial work. Tasks with detail notes, 15+ minute duration, or meaningful tags are included; trivial changes like typos and lint fixes are filtered out.
• UTF-8 text sanitization — All text fields are cleaned on input: NFKC Unicode normalization, control character removal, surrogate stripping, and whitespace collapsing. No broken characters in your logs.
• Rebuild from source — Weekly worklogs can be regenerated from raw daily data at any time, so edits to daily logs are always reflected.

Requirements

• Python 3.11+
• Claude Desktop or Claude Code

Installation

git clone https://github.com/YOUR_USERNAME/claude-session-logger.git
cd claude-session-logger
pip install -e .

Verify:

python -c "from session_logger.server import mcp; print('OK')"

Setup

Claude Desktop (Windows/macOS)

Open the config file:

# Windows
notepad %APPDATA%\Claude\claude_desktop_config.json

# macOS
open ~/Library/Application\ Support/Claude/claude_desktop_config.json

Add the server to the mcpServers section:

{
  "mcpServers": {
    "session-logger": {
      "command": "python",
      "args": ["-m", "session_logger.server"],
      "cwd": "C:\\path\\to\\claude-session-logger"
    }
  }
}

Restart Claude Desktop after saving.

Claude Code (CLI)

claude mcp add session-logger --scope user -- python -m session_logger.server

To enable automatic logging, add this to your CLAUDE.md or project custom instructions:

After completing each distinct task, call session_log_task with a one-line summary, relevant tags, and status. Log automatically whenever you commit changes with Git.

Tools

Tool	Description
session_log_task	Record a task to today's daily log. Substantial entries are auto-appended to the weekly worklog.
session_view_log	View a day's entries in Markdown or JSON format. Defaults to today.
session_list_days	List all dates with log entries, reverse chronological.
session_daily_summary	Aggregate stats for a day: task counts by status, total duration, tags, projects.
session_weekly_worklog	View the cumulative Mon–Sun worklog. Use rebuild=true to regenerate from raw daily data.

Task fields

Field	Required	Description
summary	Yes	One-line description of the completed work
detail	No	Longer notes, context, or follow-up items
status	No	completed (default), partial, blocked, or deferred
tags	No	Category labels like bugfix, refactor, docs
project	No	Project or repo name for grouping
duration_minutes	No	Estimated time spent (0–1440)

How the weekly worklog works

When a task is logged, the server classifies it as substantial or minor:

Substantial (included in the weekly worklog):

• Has detail text
• Duration of 15 minutes or more
• Carries tags beyond trivial categories

Minor (daily log only):

• Tagged only with typo, formatting, whitespace, lint, cleanup, trivial, style, nit, or cosmetic
• No detail text and under 15 minutes

Substantial tasks are appended to worklog-YYYY-WNN.md as they're logged. Each ISO week (Monday–Sunday) gets its own file. The session_weekly_worklog tool can also rebuild the worklog from raw daily JSONL data if entries are edited or deleted after the fact.

File structure

~/.claude-session-logs/
├── 2026-03-31.jsonl            # Daily task log (one JSON object per line)
├── 2026-04-01.jsonl
├── worklog-2026-W14.md         # Weekly worklog (Mon Mar 30 – Sun Apr 5)
└── ...

Configuration

Set SESSION_LOG_DIR to change the log directory:

# Linux/macOS
export SESSION_LOG_DIR=~/Documents/claude-logs

# Windows (persistent)
setx SESSION_LOG_DIR "C:\Users\you\Documents\claude-logs"

Default: ~/.claude-session-logs/

Reading logs outside Claude

# View today's raw entries
cat ~/.claude-session-logs/2026-03-31.jsonl | python -m json.tool --json-lines

# View this week's worklog
cat ~/.claude-session-logs/worklog-2026-W14.md

# Count tasks by project across all logs
cat ~/.claude-session-logs/*.jsonl | python -c "
import sys, json
from collections import Counter
c = Counter(json.loads(l).get('project','(none)') for l in sys.stdin)
for proj, n in c.most_common(): print(f'{n:4d}  {proj}')
"

Project layout

claude-session-logger/
├── pyproject.toml
├── README.md
└── session_logger/
    ├── __init__.py
    ├── sanitize.py     # UTF-8 text cleaning and tag normalization
    ├── models.py       # Pydantic schemas: TaskEntry, DailySummary, WeeklyWorklogEntry
    ├── store.py        # File I/O: daily JSONL, weekly Markdown, summaries
    └── server.py       # FastMCP server and tool definitions

License

MIT