Support public environment-origin MCP through shared Harness bindings

CONTRIBUTING.md

@@ -211,7 +211,9 @@ The Runtime is not a sandbox; see
   in the common protocol or flow, not with Harness-, Runtime- or vendor-specific
   branches in Core. Adapters may differ natively but keep shared semantics.
 - Express compatibility through declared capabilities and validate selected
-  combinations explicitly. Replaceability does not mean every model, Harness and
+  combinations explicitly. Public MCP origin and credential authority follow the
+  [Environment MCP contract](contracts/agents-api/environments.md#public-mcp-connection-origin);
+  changing an input source must not change outbound network or credential scope. Replaceability does not mean every model, Harness and
   Environment combination is supported. Never silently substitute another
   implementation or give a capability different meanings per vendor.
 - Core preparation and execution never branch on operating system or

apps/docs/content/docs/agents-and-tools.mdx

@@ -31,7 +31,8 @@ and Environment Plugin MCP have separate inventories and qualification.
 | Function image results | Successful ordered inline PNG/JPEG with text, large PNG and image-only JPEG: Codex/Claude `none` F1/F2; Docker M2. Public Items retain submitted bytes. Codex receipt regression: F2. | Claude rejects failed images and remote references before persistence; native resizing may change its image bytes. Self-hosted Claude image results use the same native path; see the current [qualification record](https://github.com/MiniMax-AI/parsar-core/blob/f6d258735fc601c521dd990e6f9e1ed261f4ef2d/contracts/agents-api/environment-capabilities-qualification.md). MiniMax functions remain unqualified. Other Codex image/error/reference combinations cannot be inferred from successful-inline evidence. |
 | Deferred function discovery | Type-only `tool_search` plus mixed eager/deferred functions: Claude SDK 0.3.269/native 2.1.269, Kimi K3, single Agent, medium, `none`, text results; text and PNG input D1. Native provider observations establish lazy schema loading for D1. [Self-hosted workspace callback, continuation and cancellation](https://github.com/MiniMax-AI/parsar-core/blob/f6d258735fc601c521dd990e6f9e1ed261f4ef2d/contracts/agents-api/environment-capabilities-qualification.md) use the same native path; they do not add model-request observer evidence. [Contract](https://github.com/MiniMax-AI/parsar-core/blob/f6d258735fc601c521dd990e6f9e1ed261f4ef2d/contracts/agents-api/tool-search.md). | A repeated `tool_search` is a protocol error. Codex/MiniMax discovery, search-only/missing-search, workspace with Skills/Plugins, MCP, structured-output and Subagent combinations remain gaps. Opaque native policy changes lack a reliable pre-input deferral signal. Saved tools include `tool_search`; the pinned Session response union excludes it. Exact hosted projection is unverified. |
 | Explicit disabled search/PTC | Saved and inline `web_search.mode=disabled` and `programmatic_tool_calling.enabled=false`; shared native controls on initial and cold execution. All three harnesses on `none`: P1, including native inventory/control evidence. [Contract](https://github.com/MiniMax-AI/parsar-core/blob/f6d258735fc601c521dd990e6f9e1ed261f4ef2d/contracts/agents-api/tool-policy.md), [parser](https://github.com/MiniMax-AI/parsar-core/blob/f6d258735fc601c521dd990e6f9e1ed261f4ef2d/services/agents-api/internal/api/disabled_tools.go). | Unsupported explicit enablement rejects at Session admission; saved Agents keep every pinned search mode as resource data (TV-05), and Sessions from such Agents reject unless they replace the tools. A repeated `web_search` is a protocol error. Omission retains approved native behavior, which does not establish official default-on PTC parity. Enabled search and default/error parity remain gaps; unrelated native utilities are not implicitly removed. |
-| Agent service-origin MCP | Implemented Codex/Claude HTTP `none` profiles, anonymous/static bearer, scoped Vault selection and native `mcp_call` Items. [Configuration and qualification limits](https://github.com/MiniMax-AI/parsar-core/blob/f6d258735fc601c521dd990e6f9e1ed261f4ef2d/services/agents-api/README.md#http-mcp-execution), [profiles](https://github.com/MiniMax-AI/parsar-core/blob/f6d258735fc601c521dd990e6f9e1ed261f4ef2d/services/agents-api/internal/engine/profile.go). | This closure batch does not requalify MCP/provider combinations. MiniMax, self-hosted/hosted service-origin MCP, OAuth, nonempty inline headers/metadata and other transports/origins reject. Claude requires a static connected inventory; original MCP-envelope fidelity and continuing server health are unverified. |
+| Agent service-origin MCP | Implemented Codex/Claude HTTP `none` profiles, anonymous/static bearer, scoped Vault selection and native `mcp_call` Items. [Configuration and qualification limits](https://github.com/MiniMax-AI/parsar-core/blob/f6d258735fc601c521dd990e6f9e1ed261f4ef2d/services/agents-api/README.md#http-mcp-execution), [profiles](https://github.com/MiniMax-AI/parsar-core/blob/f6d258735fc601c521dd990e6f9e1ed261f4ef2d/services/agents-api/internal/engine/profile.go). | This closure batch does not requalify MCP/provider combinations. MiniMax, self-hosted/hosted service-origin MCP, OAuth, nonempty inline headers/metadata and other transports reject. Environment origin follows the separate row below. Claude requires a static connected inventory; original MCP-envelope fidelity and continuing server health are unverified. |
+| Agent Environment-origin MCP | Public HTTP declarations reuse installed MCP's effective Runtime bindings; attached Vault selection and native observations remain common. [Origin and Harness matrix](/environments-and-files#public-mcp-connection-origin), [real qualification](https://github.com/MiniMax-AI/parsar-core/blob/e974a7f880a2eb799f0dd39e6ba0870462854a53/contracts/agents-api/public-mcp-qualification.md). | Requires a workspace and enabled network. MiniMax rejects every non-null allowlist and required initialization. No service-origin relocation, automatic fallback or credential copy into native profiles. |
 | Environment Plugin MCP/native tools | Separate [Docker Plugin transport matrix](https://github.com/MiniMax-AI/parsar-core/blob/f6d258735fc601c521dd990e6f9e1ed261f4ef2d/contracts/agents-api/environment-templates.md#environment-origin-mcp-plugins) and [V1 deployment evidence](https://github.com/MiniMax-AI/parsar-core/blob/f6d258735fc601c521dd990e6f9e1ed261f4ef2d/contracts/agents-api/user-managed-runtime-v1.md). Native tools stay within the existing colocated Runtime. | Plugin MCP is not Agent service-origin MCP or a public function action. No new optional cross-product is qualified here. Native utility inventories need not be identical. |
 | Required action: `function_call` | Session GET/list and Session SSE expose persisted `{arguments,call_id,name,turn_id,type}`. Actions remain pending until native application or cancellation/terminal settlement. [Projection](https://github.com/MiniMax-AI/parsar-core/blob/f6d258735fc601c521dd990e6f9e1ed261f4ef2d/services/agents-api/internal/store/function_state.go), [confirmation](https://github.com/MiniMax-AI/parsar-core/blob/f6d258735fc601c521dd990e6f9e1ed261f4ef2d/services/agents-api/internal/store/function_results.go); real handling F1/F2/M2/S1/S2/D1; explicit client disconnect/query/reconnect: F3. | Function-call history is not pending-state authority. Client reconnect does not replay events or redo external application effects. |
 | Required action: `environment_connection` | Offline waiting input exposes `{environment_id,type}` before Turn creation. Connect the exact Session Environment through our scoped daemon enrollment. Three-harness Docker/E2B execution: E1; explicit initial pending-input/query/connection/native completion: E2; expiry: [controlled initial-input test](https://github.com/MiniMax-AI/parsar-core/blob/f6d258735fc601c521dd990e6f9e1ed261f4ef2d/services/agents-api/tests/official_self_hosted_initial.py). | Idle offline Sessions without pending input request nothing. Registration alone is not connectivity or native readiness. Stock `exec-server`/Noise transport is outside the approved V1 route. Exact upstream registration/action-removal timing remains unverified. |