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docs: Added documentation for secret injection support into environment variables for agents

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Alex Clarke
2025-11-07 12:28:11 -07:00
parent 1a45ce9dc1
commit 09379e7231
1 changed files with 54 additions and 4 deletions
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docs/VAULT.md
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@@ -7,6 +7,19 @@ functions as a universal secret management tool.
![Vault Demo](./images/vault/vault-demo.gif)
## Quick Links
<!--toc:start-->
- [Usage](#usage)
- [CLI Usage](#cli-usage)
- [REPL Usage](#repl-usage)
- [Motivation](#motivation)
- [How it works](#how-it-works)
- [Supported Files](#supported-files)
- [Environment Variable Secret Injection in Agents](#environment-variable-secret-injection-in-agents)
<!--toc:end-->
---
## Usage
The Loki vault can be used in one of two ways: via the CLI or via the REPL for interactive usage.
@@ -98,9 +111,10 @@ At runtime, Loki will detect the templated secret and replace it with the decryp
At the time of writing, the following files support Loki secret injection:
| File Type | Description | Limitations |
|----------------------|-----------------------------------|----------------------------------------------------------------|
|-------------------------|-----------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------|
| `config.yaml` | The main Loki configuration file | Cannot use secret injection on the `vault_password_file` field |
| `functions/mcp.json` | The MCP server configuration file | |
| `<agent>/tools.<py/sh>` | Tool files for agents | Specific configuration and only supported for Agents, not all global tools ([see below](#environment-variable-secret-injection-in-agents) |
Note that all paths are relative to the Loki configuration directory. The directory varies by system, so you can find yours by
@@ -109,3 +123,39 @@ running
```shell
dirname $(loki --info | grep config_file | awk '{print $2}')
```
## Environment Variable Secret Injection in Agents
Secrets from the Loki vault can be injected into agent `tools.sh/tools.py` as environment variables. This is done as
follows:
1. Ensure a secret named `MY_USERNAME` is in your Loki vault.
2. Set the name of the secret as the default value for a variable
`<agent>/config.yaml`
```yaml
name: Username
description: An AI agent that demonstrates agent capabilities
instructions: |
You are a AI agent designed to demonstrate agent capabilities.
variables:
- name: username
description: Your user name
# Configure the secret you want to inject using the same templating mentioned above; i.e. wrap the
# case-sensitive name in '{{}}'
default: '{{MY_USERNAME}}'
```
3. Reference the variable in your `<agent>/tools.<py/sh>` file using the familiar variable injection name; that is,
since the name of the variable is `username`, the environment variable that will be provided to the tool call will
be named `LLM_AGENT_VAR_USERNAME`
`tools.sh`
```bash
#!/usr/bin/env bash
# @env LLM_OUTPUT=/dev/stdout The output path
# @cmd Get my username
get_my_username() {
echo "$LLM_AGENT_VAR_USERNAME" >> "$LLM_OUTPUT"
}
```
For more information about variable usage within agents, refer to the [Variables section](./AGENTS.md#user-defined-variables) of the [Agents README](./AGENTS.md)