agentmesh_marketplace 4.1.0

Plugin marketplace for the Agent Governance Toolkit — discover, install, verify, and manage plugins

Agent Marketplace

Plugin lifecycle management for the Agent Governance Toolkit — discover, install, verify, and sign plugins

Part of the Agent Governance Toolkit

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Note: This package was extracted from agentmesh.marketplace. The old import path still works via a backward-compatibility shim but new code should import from agent_marketplace directly.

What is Agent Marketplace?

Agent Marketplace provides governed plugin lifecycle management for AI agent ecosystems:

• Plugin Discovery — Browse and search registered plugins by capability, trust level, or framework
• Verified Installation — Install plugins with cryptographic integrity verification (SHA-256 + Ed25519)
• Plugin Signing — Sign plugin manifests with Ed25519 keys for supply-chain security
• Manifest Validation — Declarative plugin manifests with schema validation (capabilities, permissions, dependencies)
• Registry Management — Register, update, and deprecate plugins with version tracking

Artifact distribution vs. manifest-registration

PluginInstaller.install() operates in one of two modes depending on the manifest:

Mode	When	What happens on disk
Full artifact install	manifest.artifact_url is set	Downloads the .zip artifact, verifies its SHA-256 against manifest.artifact_sha256, unpacks plugin code under plugins_dir/<name>/, and stores .artifact.zip for on-load re-verification.
Manifest-registration only	artifact_url is absent	Writes only the signed manifest (agent-plugin.yaml). No plugin code is placed on disk.

The Ed25519 signature covers both the manifest metadata and artifact_sha256, so a valid signature cryptographically binds the manifest to the artifact. list_installed() re-verifies the manifest signature and the stored artifact hash on every call.

Quick Start

pip install agentmesh-marketplace

from agent_marketplace import PluginRegistry, PluginInstaller, PluginManifest

# Create a registry
registry = PluginRegistry()

# Register a plugin
manifest = PluginManifest(
    name="web-search",
    version="1.0.0",
    capabilities=["search", "browse"],
    permissions=["network:read"],
)
registry.register(manifest)

# Install with verification
installer = PluginInstaller(registry=registry, verify_signatures=True)
result = installer.install("web-search")

CLI

# List available plugins
agentmesh-marketplace list

# Install a plugin
agentmesh-marketplace install web-search

# Verify plugin integrity
agentmesh-marketplace verify web-search

# Sign a plugin manifest
agentmesh-marketplace sign manifest.yaml --key signing-key.pem

Ecosystem

Agent Marketplace is one of 7 packages in the Agent Governance Toolkit:

Package	Role
Agent OS	Policy engine — deterministic action evaluation
AgentMesh	Trust infrastructure — identity, credentials, protocol bridges
Agent Runtime	Execution supervisor — rings, sessions, sagas
Agent SRE	Reliability — SLOs, circuit breakers, chaos testing
Agent Compliance	Regulatory compliance — GDPR, HIPAA, SOX frameworks
Agent Marketplace	Plugin lifecycle — discover, install, verify, sign (this package)
Agent Lightning	RL training governance — governed runners, policy rewards

License

MIT — see LICENSE.