Hermes Agent

Hermes Agent is an open-source terminal AI agent by Nous Research. Signet integrates as a pluggable memory provider via Hermes’s MemoryProvider ABC, deploying a Python plugin that bridges all Signet daemon hooks into the Hermes lifecycle.

Files managed by Signet

Location	Description
`~/.hermes/plugins/signet/__init__.py`	User-level Signet `MemoryProvider` implementation
`~/.hermes/plugins/signet/client.py`	User-level HTTP client for the Signet daemon API
`~/.hermes/plugins/signet/plugin.yaml`	User-level plugin metadata
`~/.hermes/plugins/signet/signet.install.json`	Install marker with connector version and plugin source hash
`<hermes-repo>/plugins/memory/signet/__init__.py`	Signet `MemoryProvider` implementation
`<hermes-repo>/plugins/memory/signet/client.py`	HTTP client for the Signet daemon API
`<hermes-repo>/plugins/memory/signet/plugin.yaml`	Plugin metadata
`<hermes-repo>/plugins/memory/signet/signet.install.json`	Install marker with connector version and plugin source hash
`~/.hermes/config.yaml`	`memory.provider: signet` activation
`~/.hermes/.env`	Daemon connection environment variables

How it works

signet setup (with hermes-agent selected) copies the Python plugin into both ~/.hermes/plugins/signet/ and, when discovered, <hermes-repo>/plugins/memory/signet/.
The connector writes install markers, daemon connection env vars to ~/.hermes/.env, and activates the provider by setting memory.provider: signet in Hermes config.
At session start, Hermes calls initialize() on the plugin, which fires POST /api/hooks/session-start to load identity, memories, and system prompt injection from the daemon.
On each user turn, queue_prefetch() fires POST /api/hooks/user-prompt-submit for entity current-view context when the prompt mentions a known entity or active alias.
At session end, on_session_end() sends the accumulated transcript via POST /api/hooks/session-end for async pipeline extraction.

Tools exposed to the agent

Tool	Description
`memory_search`	Hybrid memory search (keyword + semantic + knowledge graph)
`session_search`	Search active or completed session transcripts
`memory_store`	Store a fact/preference/decision with auto entity extraction
`memory_get`	Retrieve a memory by ID
`memory_list`	List memories with optional filters
`memory_modify`	Edit an existing memory
`memory_forget`	Soft-delete a memory
`recall` / `remember`	Compatibility aliases for search/store

Supported hooks

Hook	Supported
session-start	yes — identity + memories via `system_prompt_block()`
user-prompt-submit	yes — entity current-view context via `queue_prefetch()` / `prefetch()`
pre-compaction	yes — daemon-generated summary guidelines via `on_pre_compress()`
compaction-complete	yes — saves summary as session memory via `on_compaction_complete()`
checkpoint-extract	yes — periodic mid-session delta extraction every 30 turns
session-end	yes — transcript extraction via `on_session_end()`

Delegation support

When Hermes delegates to subagents, the parent’s on_delegation() hook stores the task+result pair as a Signet memory tagged ["delegation", "subagent"].

Prerequisites

Hermes Agent installed (repo with plugins/memory/ directory)
Signet daemon running (signet start)
signet setup --harness hermes-agent
signet doctor hermes reports daemon health, plugin freshness, config activation, and Hermes tool routing