API Reference

Full public surface of dryade_plugins_sdk — Plugin, Agent, Tool, Route, Config, ManifestV2, packaging.

Last updated: May 19, 2026

The full public surface of dryade_plugins_sdk. Importable from the top-level package — internal sub-modules are an implementation detail and may change between minor versions.

Core protocols

Plugin

The contract every plugin must satisfy. Decorated with @runtime_checkable so isinstance(obj, Plugin) works at load time.

Required attributes:

  • name: str — unique plugin slug, snake_case.
  • version: str — semver 2.0.0.
  • description: str — human-readable.
  • core_version_constraint: str — PEP 440 spec.

Required method:

  • register(registry: Registry) -> None

Optional methods (with default no-op behavior):

  • startup(**kwargs) -> None
  • shutdown() -> None
  • get_health_checks() -> Mapping[str, HealthCheck]
  • get_manageable_components() -> Iterable[ManageableComponent]

Agent

Universal agent contract — plugin agents satisfy this and the host’s adapter calls them uniformly across CrewAI / LangChain / ADK / A2A / MCP.

Methods:

  • get_card() -> AgentCard
  • async execute(task: str, context: dict | None = None) -> AgentResult
  • get_tools() -> list[dict]

Tool

A plugin tool — callable with a ToolSchema attribute.

Use the @tool(name=..., description=...) decorator to stamp the schema onto a plain function.

Route

A plugin HTTP route handler — callable with a RouteSpec attribute.

Use the @route(path=..., method=...) decorator to register an HTTP path.

Config

Per-plugin runtime configuration — the host injects a Config implementation.

KV

Per-plugin key-value store with optional TTL. The host injects an implementation that namespaces keys to your plugin.

Leash + IsolationLevel

Sandbox-policy declaration (see Concepts § Leash).

Supporting models

  • HealthCheck — dataclass for plugin-declared health checks.
  • ManageableComponent — dataclass for runtime-manageable components.
  • AgentFramework — enum (CREWAI, LANGCHAIN, ADK, A2A, MCP, CUSTOM).
  • AgentCard, AgentCapability, AgentCapabilities, AgentResult, OutputContract — Pydantic models for agent metadata.

Manifest

ManifestV2

Dataclass wrapper over the v2 JSON schema. Construct it with the manifest dict and it raises ManifestValidationError if anything fails the schema.

import json
from dryade_plugins_sdk import ManifestV2

data = json.loads(open("dryade.json").read())
known = ManifestV2.__dataclass_fields__
manifest = ManifestV2(**{k: v for k, v in data.items() if k in known})

Packaging

CONTRACT_VERSION

Integer constant — current value 4.

compute_plugin_hash_pair(plugin_dir: Path) -> tuple[str, str]

Walks the plugin directory, hashes every .py file under SHA-256 + SHA3-256, returns the (sha256_hex, sha3_256_hex) pair.

sign_manifest(manifest: dict, private_key_path: Path) -> dict

Adds signature (128-char hex Ed25519) and optional signature_pq fields. Mutates and returns the manifest.

load_private_key(path: Path)

Loads an Ed25519 private key, asserting mode 0o600 (fails closed otherwise).

verify_plugin_hash(manifest: dict, plugin_dir: Path) -> bool

Re-computes both hashes and asserts equality with the manifest fields. Used by dryade plugin validate and (re-implemented) by Dryade core’s loader.

Hooks

  • @traced(name=...) — stamps _traced_name on the function. The host wraps it with an OpenTelemetry span at load time.
  • @hook(event=...) — stamps _hook_event. The host subscribes the function to the matching pub/sub topic.

Exceptions

  • DryadePluginError — base.
  • PluginValidationError — --tier community, schema fail, missing attribute.
  • ManifestValidationError — manifest schema mismatch.
  • AgentExecutionError — agent runtime failure.
  • HashMismatchError — plugin source hash drift.

Testing fixtures (dryade_plugins_sdk.testing)

Test fixtures so authors pytest without installing Dryade:

  • FakeHost — in-memory host. Use host.load(plugin) then assert against host.registry.tools, host.registry.routes, host.registry.agents, host.registry.health_checks, host.registry.components.
  • FakeRegistry — what FakeHost.registry returns.
  • MockKV — TTL-aware in-memory KV.
  • MockConfig — patchable in-memory Config.
  • MockLLM(responses=[...]) — scripted LLM stub. Records every call as LLMCall.
  • build_plugin, build_agent, build_tool — factory helpers.

Version info

  • __version__ — SDK version string.
  • __contract_version__ — current plugin contract (4).