Skip to content
OpaqueVault
ProductSecurityPricingDocsVault
Sign inGet started ↗
Menu+
ProductSecurityPricingDocsVaultCompareSign inGet started ↗
Vault

Ideas worth
keeping in mind.

Security architecture, everyday development, and the changing relationship between agents and secrets.

OV
Notes from the vault
Latest writingAugust 18, 2026

Does Your MCP Secret Server Hand the Plaintext to the Model?

Inspect MCP response schemas, credential injection, and output handling to see whether secret values can enter your AI agent's context.

Read the article ↗
01August 18, 2026zero-knowledge / e2ee

Is Phase Zero-Knowledge? E2EE and Server-Side Encryption

Phase uses end-to-end encryption by default and offers optional server-side encryption. Here is how those modes change the trust boundary.

Read the article ↗
02May 7, 2026claude-code / cursor

How to Keep API Keys Out of an AI Coding Agent

A practical guide to preventing API keys from leaking into Claude Code, Cursor, and Cline — covering common failure modes, vault patterns, and incident response.

Read the article ↗
03April 18, 2026macos / secrets-management

Apple Keychain Is Not Enough to Protect Secrets from Claude Code

macOS Keychain keeps secrets encrypted at rest. The moment you use the security CLI to pull them into your shell — and Claude Code is running — you've already lost.

Read the article ↗
04April 16, 2026secrets-management / on-premise

AI Agents On-Premise — Where Credentials Should Live

How parent environments, child-process injection, and credential brokers affect secret exposure in self-hosted AI workflows.

Read the article ↗
05April 16, 2026claude-code / security

What the Claude Code Source Leak Reveals About AI Agent Security

Anthropic accidentally shipped 60MB of Claude Code's unobfuscated source code in an npm package. Here's what security researchers found inside — and what it means for how you think about AI agent credentials.

Read the article ↗
06April 16, 2026cloudflare / secrets-management

Cloudflare Workers Secrets and AI Development — What's Actually Safe

Separate deployed Worker secret bindings from local development credentials, and understand which processes and tools can read each value.

Read the article ↗
07April 16, 2026claude / api-keys

Stop Telling Claude to Read Your .env File

The advice spreading across AI communities — 'just create a .env file and have Claude read it' — is wrong, and here's why it matters.

Read the article ↗
08April 13, 2026claude-code / security

How to Keep API Keys Secure When Using Claude Code

Keep API keys out of readable project files and use scoped command execution to reduce exposure in AI coding workflows.

Read the article ↗
09April 13, 2026claude-code / secrets-management

How to Store Secrets for Claude Code (Without Putting Them in .env)

The standard .env approach exposes your API keys to Claude's context window. Here's the correct way to store and use secrets with Claude Code.

Read the article ↗
10April 13, 2026mcp / secrets-management

MCP Secret Manager — How OpaqueVault Works

How OpaqueVault encrypts secrets locally, injects them into commands, and keeps values and subprocess output out of MCP responses.

Read the article ↗
11April 13, 2026mcp / secrets-management

MCP Server Secrets Management — The Complete Guide

How to manage credentials across MCP servers without exposing them to the AI. Architecture, patterns, and a reference implementation with OpaqueVault.

Read the article ↗
12April 13, 2026zero-knowledge / security

Zero-Knowledge Secret Manager — What It Is and Why It Matters for AI Agents

A zero-knowledge secret manager means the server cannot decrypt your secrets. Here's why that architecture matters — especially when AI coding agents are in the loop.

Read the article ↗
13April 10, 2026security / mcp

24,000 secrets found in MCP config files — what it means and how to fix it

Researchers found 24,008 live API keys and credentials inside Claude Desktop MCP configuration files. Here's what went wrong and how zero-knowledge vaults change the equation.

Read the article ↗
14April 8, 2026migration / hashicorp

HCP Vault Secrets End of Life — Migration Options

HCP Vault Secrets reached its announced end-of-life deadline in July 2026. Review replacement options and the requirements for rebuilding your workflow.

Read the article ↗
15April 5, 2026security / claude-code

Why your AI coding assistant is a secret leak waiting to happen

Claude Code, Cursor, and GitHub Copilot dramatically accelerate development — and, if misconfigured, dramatically accelerate credential exposure. Here's the structural problem and how to fix it.

Read the article ↗
OpaqueVault

Your secrets. Yours alone.

ExploreSecurityPricingCompareVault
ResourcesDocumentationDesktop LiteGitHub ↗Status ↗

© 2026 OpaqueVault · Created by The Hunter Foundry

PrivacyTermsLicense