pi-pass-secrets

Pi Coding Agent extension that reads API keys from GNU Password Store (pass) on startup and injects them into the session environment.

Secrets are never exposed to the LLM. All tool output (bash, read, grep, etc.) is scanned and any leaked secret values are replaced with [REDACTED].

Why pass?

• Encryption at rest — all secrets are GPG-encrypted on disk
• Git-friendly — ~/.password-store is a git repo you can sync
• No daemon — stateless, no background process
• Proven — the standard Unix password manager since 2012

How it works

1. On session_start, the extension reads configured pass paths and injects them into process.env
2. All subsequent tool calls (including bash) inherit the secrets
3. A global tool_result hook scans every tool output for known secret values and replaces matches with [REDACTED]
4. On session_shutdown, secrets are cleared from process.env

Install

pi install git:github.com/okiess/pi-pass-secrets

Or locally during development:

pi install ~/workspace/versioned/pi-pass-secrets

Setup

1. Store your API keys in pass

pass insert apikeys/openai
pass insert apikeys/anthropic
pass insert apikeys/opencode

2. Configure mappings

Add to ~/.pi/agent/settings.json:

{
  "pass-secrets": {
    "mappings": {
      "apikeys/openai": "OPENAI_API_KEY",
      "apikeys/anthropic": "ANTHROPIC_API_KEY",
      "apikeys/opencode": "OPENCODE_API_KEY"
    }
  }
}

3. Reference in provider config

Your providers/models should already use $ENV_VAR references:

{
  "apiKey": "$OPENCODE_API_KEY"
}

No changes needed — the extension injects the env var before providers resolve it.

Commands

Command	Description
/pass-secrets status	Show loaded keys (values masked: sk-a...4670)
/pass-secrets reload	Re-read all secrets from pass
/pass-secrets help	Show help

Security model

What the agent can see:

• Which env vars are loaded (e.g. $OPENCODE_API_KEY loaded)
• A masked preview (sk-a...4670)

What the agent cannot see:

• Plaintext secret values
• Secrets in any tool output (redacted globally)

Known limitations:

• Secrets shorter than 5 characters are not redacted (too many false positives)
• If a child process prints a secret, the recursive output redaction catches it — but the child process itself has access to the env var (by design)
• Encoding transforms (base64, hex, reverse) bypass exact-match redaction

License

MIT