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docs: context engine plugin system + unified hermes plugins UI

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New page:
- developer-guide/context-engine-plugin.md — full guide for building
  context engine plugins (ABC contract, lifecycle, tools, registration)

Updated pages (11 files):
- plugins.md — plugin types table, composite UI documentation with
  screenshot-style example, provider plugin config format
- cli-commands.md — hermes plugins section rewritten for composite UI
  with provider plugin config keys documented
- context-compression-and-caching.md — new 'Pluggable Context Engine'
  section explaining the ABC, config-driven selection, resolution order
- configuration.md — new 'Context Engine' config section with examples
- architecture.md — context_engine.py and plugins/context_engine/ added
  to directory trees, plugin system description updated
- memory-provider-plugin.md — cross-reference tip to context engines
- memory-providers.md — hermes plugins as alternative setup path
- agent-loop.md — context_engine.py added to file reference table
- overview.md — plugins description expanded to cover all 3 types
- build-a-hermes-plugin.md — tip box linking to specialized plugin guides
- sidebars.ts — context-engine-plugin added to Extending category
This commit is contained in:
Teknium 2026-04-10 19:01:41 -07:00 • committed by Teknium
parent 436dfd5ab5
commit 79198eb3a0
12 changed files with 312 additions and 11 deletions
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website/docs/developer-guide/context-compression-and-caching.md
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Hermes Agent uses a dual compression system and Anthropic prompt caching to
manage context window usage efficiently across long conversations.
Source files: `agent/context_compressor.py`, `agent/prompt_caching.py`,
`gateway/run.py` (session hygiene), `run_agent.py` (search for `_compress_context`)
Source files: `agent/context_engine.py` (ABC), `agent/context_compressor.py` (default engine),
`agent/prompt_caching.py`, `gateway/run.py` (session hygiene), `run_agent.py` (search for `_compress_context`)
## Pluggable Context Engine
Context management is built on the `ContextEngine` ABC (`agent/context_engine.py`). The built-in `ContextCompressor` is the default implementation, but plugins can replace it with alternative engines (e.g., Lossless Context Management).
```yaml
context:
engine: "compressor" # default — built-in lossy summarization
engine: "lcm" # example — plugin providing lossless context
```
The engine is responsible for:
- Deciding when compaction should fire (`should_compress()`)
- Performing compaction (`compress()`)
- Optionally exposing tools the agent can call (e.g., `lcm_grep`)
- Tracking token usage from API responses
Selection is config-driven via `context.engine` in `config.yaml`. The resolution order:
1. Check `plugins/context_engine/<name>/` directory
2. Check general plugin system (`register_context_engine()`)
3. Fall back to built-in `ContextCompressor`
Plugin engines are **never auto-activated** — the user must explicitly set `context.engine` to the plugin's name. The default `"compressor"` always uses the built-in.
Configure via `hermes plugins` → Provider Plugins → Context Engine, or edit `config.yaml` directly.
For building a context engine plugin, see [Context Engine Plugins](/docs/developer-guide/context-engine-plugin).
## Dual Compression System
Hermes has two separate compression layers that operate independently: