v0.8.0

Highlights

Agent Client Protocol (experimental)

• The new wassette acp command runs a stdio agent host, allowing an Agent Client Protocol (ACP) editor to drive a WebAssembly agent. Existing MCP commands are unchanged (#770).
• An ACP chain has one terminal provider and optional layers, specified in CLI order. Layers intercept agent calls downstream and client updates upstream; multiple providers are rejected for now (#770).
• The new wassette:acp@7.0.0 WIT package defines provider and layer worlds. The host bridges ACP JSON-RPC over stdio through Wasmtime's async component model, keeping protocol output on stdout and logs on stderr (#770).
• Providers and layers can resolve from a local path, a supported URI, or the existing Wassette component store (#770).

Policies and secrets

• Wassette policies govern network access, HTTP destinations, storage, and environment access for ACP components (#770).
• A layered chain shares one WASI context, so policy grants are shared rather than isolated. Chains with policy grants, stored secrets, or --allow-all must explicitly opt in with --allow-shared-grants (#770).
• Secrets configured with wassette secret set <component-id> KEY=value are available to that component through wasmcloud:secrets lookups (#770).

Known limitations

• ACP agents cannot yet call Wassette WebAssembly components as tools, so this release does not close #756 (#770).
• Provider terminal calls bypass layers, so layers cannot intercept them (#770).
• Multi-provider sessions remain disabled (#770).
• Concurrent layered callbacks can misroute stage-specific imports; avoid untrusted layers (#770).

Examples and testing

• Offline echo-provider and uppercase-layer demo components are included, along with just build-acp-examples and just test-acp recipes (#770).

Maintenance

• OCI support reverts to oci-client 0.17, and the deprecated rmcp ServerInfo is replaced (#822).
• The winget and Homebrew definitions are updated for v0.7.1 (#809).

What's Changed

• chore: update winget and homebrew for v0.7.1 by Aaron Wislang (@asw101) in #809
• fix(deps): revert oci-client to 0.17 and replace deprecated rmcp ServerInfo by Aaron Wislang (@asw101) in #822
• Agent Client Protocol (ACP) Support by Aaron Wislang (@asw101) in #770

Full Changelog: v0.7.1...v0.8.0

Downloads

Linux

• AMD64 (tar.gz)
• ARM64 (tar.gz)

macOS (Darwin)

• AMD64/Intel (tar.gz)
• ARM64/Apple Silicon (tar.gz)

Windows

• AMD64 (zip)
• ARM64 (zip)

Install

All Platforms (Shell Script)

curl -fsSL https://raw.githubusercontent.com/microsoft/wassette/main/scripts/install.sh | WASSETTE_GITHUB_REPO=microsoft/wassette bash

This will detect your platform and install the latest wassette binary to your $PATH.

Usage

# Local MCP client integration (stdio)
wassette run

# Remote MCP server (Streamable HTTP)
wassette serve