OpenClaw Prompt Caching: The Setting That Saves 50%

ByL.B. Kaelin

Your AI agent is burning money on repeat work. Every time it runs a task, it’s paying for the same LLM calls, the same API requests, the same expensive processing. That cost adds up fast.

OpenClaw prompt caching is the setting that stops this waste. It’s a simple toggle that tells your agent to remember expensive operations and reuse the results. Think of it like a cook who writes down a complex recipe after figuring it out the first time, instead of starting from scratch every single meal.

This isn’t a minor optimization. For most workflows, enabling prompt caching cuts your LLM and tool usage costs by 30% to 50%. The savings are immediate and automatic. You don’t have to change a single line of your agent’s code.

By the end of this, you’ll know exactly where the switch is, how to flip it, and how to verify it’s working. You’ll stop paying for redundant computation and let your agent focus its budget on new problems.

What You Need Before Starting

You can’t turn on a feature if the system isn’t running. These are the base requirements. If you’re already running OpenClaw, you can skim this list.

  • A Running OpenClaw Instance: Prompt caching is a server-side feature. Your agent needs to be connected to a live OpenClaw backend, not just a standalone script. Think of it like needing the car’s engine on before you can use cruise control.
  • Access to the OpenClaw Configuration File: The setting lives in a config file, usually config.yaml or .env. You need to be able to edit this file, which means you either set up OpenClaw yourself or have admin access to the server.
  • Basic Terminal Comfort: You’ll be running a command or two to restart the service. If the words “SSH” or “command line” make you nervous, take a breath. We’ll give you the exact commands to copy. It’s three lines.
  • An Agent That Does Repeat Work: This setting saves money when your agent performs the same or similar tasks. If your agent does completely unique work every single time, caching won’t help. Most agents have repetitive patterns, like checking the same data source or formatting outputs the same way.

Setting Up Your Environment

This is about getting to the control panel. We’re locating the config file and preparing to change a single value. The hard part is already over, you installed OpenClaw.

Locate Your OpenClaw Configuration

The setting lives in a YAML or environment file. Where it is depends on how you installed OpenClaw. You need to find it.

You are my OpenClaw agent. Do the following:
1. Find the main OpenClaw configuration file. Common locations are: /etc/openclaw/config.yaml, ~/.openclaw/config.yaml, or in the project root as `config.yaml` or `.env`.
2. Check each location and tell me the path if you find a relevant config file.
3. If you find a `.env` file, show me the lines that start with `CACHE_` or `PROMPT_CACHE`.
4. If you find a `config.yaml` file, show me the `cache` or `prompt_cache` section.

Your agent will search and print the file path and any existing cache settings. If it finds nothing, your config might be in a non-standard place, which is fine. We’ll create it.

Manual Fallback: Finding the Config

If your agent can’t find it, you likely know where you installed OpenClaw. Navigate there in your terminal.

# If you used a standard install:
ls -la /etc/openclaw/ 2>/dev/null || echo "Not in /etc"
ls -la ~/.openclaw/ 2>/dev/null || echo "Not in home directory"

# If you cloned the repo:
cd /path/to/your/openclaw-project
ls -la config.yaml .env 2>/dev/null

Look for config.yaml, config.yml, or a .env file. If none exist, you’ll create one in the next step. Don’t worry.

Prepare to Edit the File

You need a text editor ready. On the server, nano or vim works. Locally, use any editor like VS Code.

Permission-giving: If you get a “permission denied” error when saving, you need to edit with sudo (Linux/Mac) or as an administrator (Windows). This is normal for system-wide installs.

You are my OpenClaw agent. Do the following:
1. Based on where we found the config, open the file in a read-only mode to confirm its structure.
2. For a `.env` file, show me the first 20 lines.
3. For a `config.yaml` file, show me the entire file.
4. Tell me which editor command I should use to edit it (e.g., `sudo nano /etc/openclaw/config.yaml`).

The agent will give you the exact command to run for editing. Copy that command. You’re now ready to flip the switch.

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