feat: support model context protocol

[appcypher]

Feature Request

Add support for Anthropic's Model Context Protocol (MCP) to enable richer multi-agent interactions and context retrieval.

Motivation

MCP is gaining adoption in the agent ecosystem, with projects like Goose already implementing it. Supporting MCP would:

• Keep rig competitive with other agent frameworks
• Provide a standardized way to handle structured model interactions
• Enable interoperability with other MCP-compatible systems
• Allow users to build more capable agents

Proposal

Implement MCP support in rig, learning from existing implementations like Goose. This would allow for:

• Structured model outputs and validation
• Rich context management across interactions
• Tool/function integration

Drawbacks:

• Additional implementation complexity
• Protocol still evolving

Alternatives

1. Create rig-specific protocols

   • Would miss out on the rapidly growing ecosystem of MCP tools
   • Extra burden on users working across frameworks

2. Wait for more adoption

   • Fall behind other frameworks already supporting MCP
   • Miss opportunity to shape the ecosystem

[0xMochan]

Yes! MCP is one of the most important feature-sets we are looking to integrate with Rig. You actually beat me to an issue as I am currently working up a mega-issue / epic to pin to the repo outlining how we'll integrate MCP properly with Rig alongside refactoring tools to make it much easier to work with! I'll leave a comment here and relink to this issue in that mega-issue!