Resource content type in MCP tool output is not supported

[antigremlin]

Description

OpenCode currently ignores MCP tool outputs with type: "resource". This prevents agents from receiving data from tools that return embedded resources, such as the get_file_contents tool in the official github-mcp-server.

When using get_file_contents, the agent receives only the status message (e.g., "successfully downloaded...") but the actual file content—returned as a resource item—is discarded.

To fix, update the MCP tool execution logic to handle resource content items so that:

1. Text resources are passed to the agent as visible output.
2. Binary/Blob resources are attached as files.

This will restore functionality for standard MCP servers that rely on embedded resources for content delivery.

This is a known pattern in the GitHub MCP server implementation (see github/github-mcp-server#607).

Plugins

None

OpenCode version

1.1.13

Steps to reproduce

1. Configure the github-mcp-server in opencode. It's enough to enable the repos toolset and read-only mode, with a readonly PAT.
2. Ask the agent to read a file from a GitHub repository (e.g., "Read CONTRIBUTING.md from anomalyco/opencode").
3. The agent will report success or confusion, as it receives the tool output [{"type": "text", "text": "successfully downloaded..."}, {"type": "resource", "resource": {...}}].
4. Export the session to confirm the file content is not there.

Screenshot and/or share link

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Operating System

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Terminal

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