MCP server subprocess env is filtered through _build_safe_env() which
only passes safe baseline vars (PATH, HOME, XDG_*) plus whatever is
explicitly in the config's env: block. Env vars from ~/.hermes/.env
are NOT inherited by MCP subprocesses. The key must go directly in
the config.yaml mcp_servers.agentmail.env section.
AgentMail requires a third-party API key (free tier available, paid
plans from $20/mo) — not appropriate for bundled skills that show
up in every user's system prompt.
Added a Requirements section at the top with clear instructions
to add AGENTMAIL_API_KEY to ~/.hermes/.env. Streamlined setup steps
to avoid duplicating the key in both .env and config.yaml.
