Hermes Agent v0.21.4 (v2026.9.21)¶

Release Date: September 21, 2026 Since v0.21.3: 5,071 non-merge commits · 5,169 changed files (+312,961 / −62,855) · 1,812 merged PRs · 2,116 issues closed

Patch release. This tag rolls up the ~1,800 PRs merged since v0.21.3 into a stable tagged release for downstream consumers (Docker images, Hermes Cloud, hosted deployments).

Highlights¶

Host-wide gateway singleton lock with a rendezvous record; the Desktop app now attaches to the running host backend instead of spawning a second one
One backend-owned connector operation with a setup card on Desktop, TUI and CLI
--format stream-json structured JSONL output for the CLI
skills.auto_load pins skills into every new session's prompt
Desktop quality of life - a chat/UI font picker, one-click local engine updates, and plugin uninstall from the Plugins hub
A decline unauthorized-DM behavior for the gateway
Configurable MCP discovery connect cap (mcp.discovery_concurrency)
session_search after/before bounds plus OR-relaxed recall retry, and hermes sessions set-journal-mode
Video catalog additions - LTX 2.5 and Kling O3
A website page for every catalog plugin and author, with pinned-commit READMEs and added/updated sorting
A dozen new community plugins in the catalog

Updating¶

hermes update
# or fresh install:
curl -fsSL https://hermes-agent.nousresearch.com/install.sh | bash

Full Changelog: v2026.9.14...v2026.9.21

← v0.21.3 - Patch Release | v0.21.5 - Patch Release →

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