Context Engine Plugins
Context Engine الإضافات
Start with meaning, then move to detail.
This lesson explains Context Engine Plugins as part of Hermes internals and extension points. You will learn what it does, when it matters, and the smallest safe test that proves it works.
If you are new, do not memorize names. Focus on three questions: what problem does this solve, what access does it need, and how can you verify the result?
For practice, inspect the first example, identify its effects, run it on test data, and compare the result with the source claim.
For advanced readers, inspect How it works, Directory structure, The ContextEngine ABC, then verify failure modes and version compatibility.
Know Python, Git, and basic project structure before changing code.
A clear outcome before you read.
- Understand Context Engine Plugins without assumed prior knowledge.
- Separate the source description from what still needs testing in your environment.
- Read the first command and identify its inputs and outputs before copying it.
Short definitions before the details.
- Tool
- A structured action the agent can call to read or change something.
How to build a context engine plugin that replaces the built-in ContextCompressor
What does the source say, and in what order?
- 01How it works
Start here to understand the core idea or structure.
- 02Directory structure
Read this after the foundation, then connect it to the previous step.
- 03The ContextEngine ABC
Read this after the foundation, then connect it to the previous step.
- 04Class attributes your engine must maintain
Read this after the foundation, then connect it to the previous step.
- 05Optional methods
Read this after the foundation, then connect it to the previous step.
- 06Per-turn context selection and observation
Read this after the foundation, then connect it to the previous step.
- 07When to use these hooks — and when NOT to
Read this after the foundation, then connect it to the previous step.
- 08Engine tools
Read this after the foundation, then connect it to the previous step.
- 09Registration
Read this after the foundation, then connect it to the previous step.
- 10Via directory (recommended)
Finish here to verify the result and special cases.
Copy only after you understand the effect.
# config.yaml
context:
engine: "compressor" # default built-in
engine: "lcm" # activates a plugin engine named "lcm"plugins/context_engine/lcm/
├── __init__.py # exports the ContextEngine subclass
├── plugin.yaml # metadata (name, description, version)
└── ... # any other modules your engine needs### Class attributes your engine must maintain
The agent reads these directly for display and logging:Read the first command and identify its inputs and outputs before copying it.
Match every command to your installed Hermes version, review the files and accounts it can reach, and use non-sensitive data for the first test. If this explanation differs from the source, the official source wins.