docs(eve): mcp channel - define native server plan

[AndrewBarba]

Summary

• define an opt-in native mcpChannel() for external agent harnesses
• expose compiled instructions, complete static skills, and eligible static tools from root and nested local agents
• exclude remote subagents and dynamic or runtime-discovered capabilities
• define stateless Streamable HTTP, direct tool execution, request-projected auth/session context, and ephemeral sandbox isolation

Public API

export default mcpChannel({
  auth: [vercelOidc(), localDev()],
  onRequest(ctx) {
    return {
      auth: defaultMcpAuth(ctx),
      session: { id: readHarnessSessionId(ctx.mcp.request) },
    };
  },
});

Logical session fields are tool-visible context only. Every tool call retains a private execution identity, fresh sandbox key, and call-scoped cleanup even when the external harness repeats a session id.

Tracking

• Add a native MCP channel for external agent harnesses #883

Validation

• pnpm docs:check
• pnpm guard:invariants
• Markdown formatting
• diff whitespace validation

No changeset: this PR only adds an internal research document.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
eve-docs	Ready	Preview, Comment, Open in v0	Jul 16, 2026 10:22pm
eve-docs-1644	Ready	Preview, Comment, Open in v0	Jul 16, 2026 10:22pm
eve-docs-4759	Ready	Preview, Comment, Open in v0	Jul 16, 2026 10:22pm