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Add per-server MCP extension data - #26
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Allow client-specific settings beside each MCP server configuration so authors do not need a separate mapping keyed by server name. Reuse reverse-domain extension namespaces across all transport variants. Validate container shapes through the existing server failure boundary while leaving namespace object contents and implemented extension behavior client-defined. Preserve portable environment semantics and the published 1.0 contract.
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Submitted as agentplugins#85. |
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Stacked on agentplugins/agent-plugins-spec#82.
Summary
This PR adds an optional
extensionsfield to each MCP server configuration in Agent Plugins 1.1.0, using the same namespace model asplugin.json. Plugin authors can keep client-specific server settings alongside the portable configuration.Motivation
In openai/codex#38438, a plugin author needed to pass an environment variable such as
DB_PASSWORDto an MCP server. Codex supported this through anenv_varslist in its native configuration, but portablemcp.jsonhad no place for that client-specific setting. The Codex fix reads a second, legacy configuration and matches servers by name to obtain their environment-variable lists.Rationale
Keeping client-specific settings beside the MCP server they affect lets authors configure that server in one place, without maintaining a separate mapping that must stay synchronized when servers are renamed or copied. Reusing the existing extension model gives clients a place for native settings while keeping their meaning client-owned.