Best AI Coding Agents for Markdown Writing
Claude Code is the best AI agent for markdown writing because it edits files directly, handles multi-file operations, and preserves markdown formatting during translation and restructuring. Gemini CLI and the llm library are solid alternatives with different tradeoffs on cost and file access. All three run inside Ritemark's built-in terminal alongside your documents.
Here are the three options for Mac writers who want AI agents editing their files directly.
1. Claude Code
Best for: Writers who need direct file edits and multi-file operations
Claude Code by Anthropic reads your markdown files, edits them in place, and saves changes that appear in Ritemark's editor immediately. It handles complex multi-step tasks — restructuring a document, translating to another language, or updating terminology across a whole folder — in one instruction.
Setup:
npm install -g @anthropic-ai/claude-code
claude
Follow the authentication prompts with an Anthropic account that has API access enabled.
Pricing: Usage-based Anthropic API billing. A single article edit typically costs 1-5 cents; heavy daily use runs $1-5/day.
Privacy: Files stay local. Content is sent to Anthropic's API only when Claude Code runs.
2. Gemini CLI
Best for: Research queries and content analysis on a free tier
Gemini CLI gives you Google's Gemini models from the command line. It reads and analyzes your files and answers questions about their content, though its file-editing capabilities are more limited than Claude Code's.
Setup:
npm install -g @google/gemini-cli
gemini auth
Sign in with your Google account.
Pricing: Free tier with usage limits. Paid API access scales with usage.
Privacy: Content is sent to Google's Gemini API when the tool runs.
3. llm Library
Best for: Quick one-off text processing across any AI provider
The llm library by Simon Willison is a pipe-based command-line tool that connects to OpenAI, Anthropic, Google, and other providers through one interface. It doesn't edit files directly — you pipe content in and redirect output to a file.
Setup:
pip install llm
llm keys set openai
Pricing: Depends on the configured provider; OpenAI usage is typically a few cents per request. Free/local models are available via plugins like llm-ollama.
Privacy: Depends on the configured provider's API.
Comparison Table
| Agent | File Access | Multi-File Operations | Setup | Price | Best For |
|---|---|---|---|---|---|
| Claude Code | Direct (reads and writes) | Excellent | npm install -g @anthropic-ai/claude-code |
Usage-based (Anthropic) | Complex editing, translation, restructuring |
| Gemini CLI | Read + analyze | Basic | npm install -g @google/gemini-cli |
Free tier available | Research, analysis, generation |
| llm Library | Pipe-based (input/output) | Manual scripting | pip install llm |
Depends on provider | Quick one-off tasks |
How to Choose
If you want an AI agent that edits your markdown files directly and handles multi-file operations, Claude Code is the strongest option and the one Ritemark's terminal workflow is built around. If you want a free tier for research and analysis, Gemini CLI works well alongside Claude Code rather than instead of it. If you need a quick one-line text transform without installing a full agent, llm gets the job done. All three run in the same terminal — many writers install all of them and switch based on the task.
Frequently Asked Questions
Which AI agent should I use for markdown writing?
Claude Code, if you want direct file edits and multi-file operations. It reads your files, makes changes in place, and preserves markdown formatting during translation and restructuring — the closest match to a writing-focused terminal workflow.
Does Gemini CLI edit files directly like Claude Code?
Not to the same extent. Gemini CLI reads and analyzes files and generates content, but its file-editing capabilities are more limited than Claude Code's direct read-write-save loop.
Can I use AI agents without an API key?
Most require an API key linked to billing. Gemini CLI offers a free tier, and the llm library supports free local models via plugins like llm-ollama. Claude Code requires a paid Anthropic API account.
Do these AI agents work offline?
Cloud-based agents (Claude Code, Gemini CLI, OpenAI via llm) need an internet connection. For offline use, install Ollama (brew install ollama) and run the llm library with the llm-ollama plugin.
Can I run multiple AI agents in the same terminal?
Yes. Claude Code, Gemini CLI, and llm are separate commands. Many writers use Claude Code for substantial editing, Gemini CLI for research, and llm for quick one-line transforms — switching between them in the same session.
How much does Claude Code cost compared to Gemini CLI?
Claude Code is usage-based with no free tier — expect 1-5 cents per article edit. Gemini CLI has a free tier with usage limits, making it cheaper for light, occasional use, though Claude Code's stronger file-editing capabilities often make the cost worthwhile for regular writing work.
Which agent handles translation best?
Claude Code. It preserves markdown formatting, creates new files, and maintains context across long documents — understanding that code blocks, links, and image paths should stay untranslated while prose gets translated.
How do I update these AI agents?
Update Claude Code with npm update -g @anthropic-ai/claude-code, Gemini CLI with npm update -g @google/gemini-cli, and the llm library with pip install --upgrade llm.