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feat(hooks): add pre_context_compress hook #3741

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eloklam wants to merge 1 commit into from
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feat(hooks): add pre_context_compress hook #3741

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19 changes: 13 additions & 6 deletions hermes_cli/plugins.py
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,7 @@
"post_llm_call",
"on_session_start",
"on_session_end",
"pre_context_compress", # Allow alternative context assembly before compression
}

ENTRY_POINTS_GROUP = "hermes_agent.plugins"
Expand All @@ -72,6 +73,7 @@ def _env_enabled(name: str) -> bool:
# Data classes
# ---------------------------------------------------------------------------


@dataclass
class PluginManifest:
"""Parsed representation of a plugin.yaml manifest."""
Expand All @@ -83,7 +85,7 @@ class PluginManifest:
requires_env: List[str] = field(default_factory=list)
provides_tools: List[str] = field(default_factory=list)
provides_hooks: List[str] = field(default_factory=list)
source: str = "" # "user", "project", or "entrypoint"
source: str = "" # "user", "project", or "entrypoint"
path: Optional[str] = None


Expand All @@ -103,6 +105,7 @@ class LoadedPlugin:
# PluginContext – handed to each plugin's ``register()`` function
# ---------------------------------------------------------------------------


class PluginContext:
"""Facade given to plugins so they can register tools and hooks."""

Expand Down Expand Up @@ -151,8 +154,7 @@ def register_hook(self, hook_name: str, callback: Callable) -> None:
"""
if hook_name not in VALID_HOOKS:
logger.warning(
"Plugin '%s' registered unknown hook '%s' "
"(valid: %s)",
"Plugin '%s' registered unknown hook '%s' (valid: %s)",
self.manifest.name,
hook_name,
", ".join(sorted(VALID_HOOKS)),
Expand All @@ -165,6 +167,7 @@ def register_hook(self, hook_name: str, callback: Callable) -> None:
# PluginManager
# ---------------------------------------------------------------------------


class PluginManager:
"""Central manager that discovers, loads, and invokes plugins."""

Expand Down Expand Up @@ -232,7 +235,9 @@ def _scan_directory(self, path: Path, source: str) -> List[PluginManifest]:

try:
if yaml is None:
logger.warning("PyYAML not installed – cannot load %s", manifest_file)
logger.warning(
"PyYAML not installed – cannot load %s", manifest_file
)
continue
data = yaml.safe_load(manifest_file.read_text()) or {}
manifest = PluginManifest(
Expand Down Expand Up @@ -306,8 +311,10 @@ def _load_plugin(self, manifest: PluginManifest) -> None:
ctx = PluginContext(manifest, self)
register_fn(ctx)
loaded.tools_registered = [
t for t in self._plugin_tool_names
if t not in {
t
for t in self._plugin_tool_names
if t
not in {
n
for name, p in self._plugins.items()
for n in p.tools_registered
Expand Down
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