ningzimu/claude-code-lens

Letzte erfasste Quellaktivität: 17. Mai 2026 um 04:41

SkillsMP-Katalog aktualisiert: 29. Oktober 2026 um 18:30

gesammelte Skills: 1

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# Claude Code Lens [![npm](https://img.shields.io/npm/v/claude-code-lens.svg)](https://www.npmjs.com/package/claude-code-lens) [![简体中文](https://img.shields.io/badge/README-简体中文-red.svg)](./README.zh-CN.md) ![Claude Code Lens hero](./assets/claude-code-lens-hero-en.png) Claude Code Lens is a local observability tool for Claude Code. It runs an Anthropic-compatible proxy between Claude Code and the real upstream service, records system prompts, messages, tool definitions, tool calls, streaming responses, and token usage, then lets you inspect them in a browser. It is designed for two workflows: - **One-off debugging**: launch a monitored Claude Code session without changing your Claude Code settings. Running `cclens` opens Claude Code in interactive mode while also starting the proxy and visualizer; append any Claude Code arguments when you need another mode, such as `cclens -p "..."` or `cclens --resume`, and they are passed through automatically. - **Long-running monitoring**: keep a local proxy running and explicitly point Claude Code at it for ongoing log capture. Use `cclens proxy`, then start Claude Code with the generated settings file or an environment variable. Why use it: - **Zero-config by default**: it can discover the real base URL used by your existing Claude Code setup. - **Non-invasive**: it does not patch Claude Code; one-shot mode does not write to `~/.claude/settings.json` or project `.claude/settings.json`. - **Full request visibility**: inspect system prompts, message history, tool schemas, tool calls, streaming output, and token usage. - **Useful for tool/MCP debugging**: verify the exact tool definitions and prompts Claude Code sent to the model. - **Local-first**: runtime config and logs live in `~/.claude-code-lens/`. ## Preview ![Claude Code Lens visualizer](./assets/visualizer-overview.png) The visualizer splits each Claude Code request into input context, model output, and resources. You can inspect system prompts, messages, tool definitions, token usage, and collapse long message history when reviewing larger sessions. ## Install Install the `cclens` CLI: ```bash npm install -g claude-code-lens ``` From a local checkout: ```bash npm install npm install -g . ``` The npm package name is `claude-code-lens`, and the installed command is `cclens`. Optional: install the Claude Code Skill for agent-driven trace analysis: ```bash npx skills add ningzimu/claude-code-lens --skill cclens-trace-analyzer ``` For a global, non-interactive install: ```bash npx skills add ningzimu/claude-code-lens --skill cclens-trace-analyzer -g -y ``` The Skill install only adds the Agent Skill. It does not run `npm install -g claude-code-lens`, so install the CLI first if you want the agent to use `cclens trace`. ## Usage Use one CLI prefix for both monitor commands and Claude Code passthrough. There are two recommended modes. ### Mode 1: Launch Claude Code With Monitoring This is the simplest mode for temporary prompt, tool, MCP, or token usage debugging. Running `cclens` starts an interactive Claude Code session and turns monitoring on automatically. ```bash cclens cclens -p "hello" cclens --resume ``` One-shot mode: 1. Starts the local proxy, default `http://localhost:18888`. 2. Starts the log visualizer, default `http://127.0.0.1:5500`. 3. Opens the browser. 4. Launches Claude Code in interactive mode; if you pass Claude Code arguments after `cclens`, they are forwarded unchanged. Except for monitor subcommands (`proxy`, `stop`, `status`, `viz`, `extract`, `config`, `help`), every argument is passed through to Claude Code automatically. Any Claude Code flag can be appended directly to `cclens`. This mode does not modify your Claude Code user or project settings. It only injects the proxy environment into the launched Claude Code process and uses `~/.claude-code-lens/settings.json` as a generated settings file. To stop the background proxy, run: ```bash cclens stop ``` ### Mode 2: Long-Running Proxy Monitoring If you want Claude Code to keep using the same local proxy over time, start the proxy manually. ```bash cclens proxy ``` The command generates: ```text ~/.claude-code-lens/settings.json ``` Start Claude Code with that settings file: ```bash claude --settings ~/.claude-code-lens/settings.json ``` Or configure only the current shell session: ```bash ANTHROPIC_BASE_URL=http://localhost:18888 claude ``` Open the monitor UI: ```bash cclens viz ``` Default URL: ```text http://127.0.0.1:5500 ``` Long-running mode is better for continuous monitoring. One-shot mode is better for temporary, no-config debugging. Stop the proxy: ```bash cclens stop ``` Check status: ```bash cclens status ``` ## CLI Help Every monitor subcommand has dedicated help: ```bash cclens --help cclens --version cclens proxy --help cclens help proxy ``` Command reference: | Command | What it does | When to use it | | --- | --- | --- | | `cclens` | Starts the proxy, visualizer, and Claude Code | One-off debugging; append Claude Code args such as `-p` or `--resume` directly | | `cclens proxy` | Starts only the local API proxy | Long-running monitoring where you explicitly configure Claude Code to use the proxy | | `cclens stop` | Stops monitor-managed background services | Stop the proxy without killing unrelated processes on the same port | | `cclens status` | Shows proxy PID and port ownership | Check whether the proxy is running or whether another process owns the port | | `cclens viz` | Starts/opens the log visualizer | Inspect existing logs without launching Claude Code | | `cclens extract [log-file]` | Extracts prompts and tools from logs | Uses the newest log by default, or a specific file when provided | | `cclens trace` | Lists, inspects, and exports session traces without the browser UI | Find a session by ID or time clue, inspect Lead/Subagent behavior, export Markdown for analysis | | `cclens config` | Prints the resolved config | Verify ports, target base URL, visualizer settings, and env overrides | | `cclens --version` | Prints the installed CLI version | Confirm which npm package version is currently installed | ### Agent-Driven Trace Analysis A Claude Code Skill is included at `skills/cclens-trace-analyzer/`. Install it with: ```bash npx skills add ningzimu/claude-code-lens --skill cclens-trace-analyzer ``` When loaded into Claude Code, the agent can run `cclens trace list → show → export → Read` on its own — no browser UI needed. It locates sessions by ID fragment or time clues, inspects Lead/Subagent behavior, exports Markdown, and reports findings with evidence and recommendations. ### Visualizer The visualizer opens automatically during one-click startup. Set `CLAUDE_CODE_LENS_OPEN_BROWSER=false` to disable that behavior. Startup output is intentionally brief. Set `CLAUDE_CODE_LENS_VERBOSE=true` to print process IDs, log paths, and startup steps. ## User Directory Runtime data is stored outside the repository: ```text ~/.claude-code-lens/ config.json # user config settings.json # generated Claude Code settings file logs/ # proxy and visualizer process logs raw_logs/ # captured API interactions prompts/ # extracted prompts and tools ``` `config.json` is optional. By default, `cclens` discovers the target Anthropic-compatible base URL from your existing Claude Code environment and settings. Target discovery priority: ```text CLAUDE_CODE_LENS_TARGET_BASE_URL > ~/.claude-code-lens/config.json target.baseUrl > ANTHROPIC_BASE_URL from the current shell > Claude Code settings env.ANTHROPIC_BASE_URL - custom --settings file - .claude/settings.local.json - .claude/settings.json - ~/.claude/settings.json > https://api.anthropic.com ``` Example `~/.claude-code-lens/config.json` for manual overrides: ```json { "proxy": { "host": "0.0.0.0", "port": 18888 }, "target": { "baseUrl": "https://api.anthropic.com", "timeout": 120000 }, "visualizer": { "host": "127.0.0.1", "port": 5500 } } ``` General configuration priority: ```text environment variables > ~/.claude-code-lens/config.json > Claude Code settings discovery > built-in defaults ``` Supported environment overrides: ```bash CLAUDE_CODE_LENS_HOME=~/.claude-code-lens CLAUDE_CODE_LENS_PROXY_HOST=127.0.0.1 CLAUDE_CODE_LENS_PROXY_PORT=18888 CLAUDE_CODE_LENS_TARGET_BASE_URL=https://api.anthropic.com CLAUDE_CODE_LENS_TARGET_TIMEOUT=120000 CLAUDE_CODE_LENS_VISUALIZER_PORT=5500 CLAUDE_CODE_LENS_LOGGING_ENABLE_CONSOLE=true CLAUDE_CODE_LENS_OPEN_BROWSER=false CLAUDE_CODE_LENS_VERBOSE=true ``` ## Logs API interaction logs: ```bash ls ~/.claude-code-lens/raw_logs/ ``` Proxy server logs: ```bash tail -f ~/.claude-code-lens/logs/proxy-server.log ``` Sensitive request headers such as `authorization` and `x-api-key` are masked in logs. Request and response bodies can still contain private project context, so review logs before sharing them. ## Project Layout ```text bin/ # unified cclens CLI src/cli/ # command orchestration src/proxy/ # local proxy and session logger src/visualizer/ # browser UI for reading raw_logs src/extractor/ # prompt/tool extraction implementation skills/ # Claude Code Skills (trace analyzer) tests/ # CLI and proxy behavior tests ``` ## Development ```bash npm install npm test npm run check ``` Package contents can be checked with: ```bash npm pack --dry-run ```

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Softwarequalitätssicherungsanalysten und -tester

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cclens-trace-analyzer

Softwarequalitätssicherungsanalysten und -tester

分析 Claude Code 会话的 trace。当用户提及 UUID 格式的 session ID（由数字与小写字母组成）、时间线索（"刚才"、"今天"、"最近一次"）、排查 Agent行为原因、希望查看某条claude code会话内容、对 trace 内容进行分析时，使用此 Skill。

Quellsprache: Chinesisch

2026-05-17

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