The standard install already includes MCP via .[all]. For users who
need to add it separately, the correct command is:
cd ~/.hermes/hermes-agent && uv pip install -e ".[mcp]"
The venv is created by uv, so bare 'pip' isn't available. All four
occurrences across 3 docs pages updated.
Expand the MCP feature docs with filtering and capability-aware registration details, add a practical 'Use MCP with Hermes' tutorial, add a config reference page, and wire the new docs into the sidebar and landing page.
