| 414 | OTel Trace Context Propagation | implemented | W3C trace context extracted from inbound requests, gateway span per hop, context injected into every upstream request |
| 932 | MCP Governance | not-applicable | process |
| 973 | Additional metadata for implementations/resources/tools/prompts | not-applicable | metadata passes through untouched |
| 985 | OAuth 2.0 Protected Resource Metadata (RFC 9728) | implemented | /.well-known/oauth-protected-resource + WWW-Authenticate resource_metadata challenge |
| 986 | Tool Name Format | implemented | namespace charset enforced in config schema |
| 990 | Enterprise IdP Policy Controls | implemented | IdP is gate one (ID-JAG issuance via EMA), fold policy engine is gate two |
| 991 | URL-based Client Registration (CIMD) | implemented | CIMD URLs are first-class client ids in policy; KV-cached resolver with SSRF guards enriches audit with client_name |
| 994 | Shared Communication Practices | not-applicable | process |
| 1024 | Client Security Requirements for Local Server Installation | not-applicable | fold is not a local-install client |
| 1034 | Default values for primitive types in elicitation schemas | not-applicable | elicitation payloads pass through untouched |
| 1036 | URL Mode Elicitation | not-applicable | passthrough |
| 1046 | OAuth Client Credentials Flow | implemented | client-credentials upstream strategy with KV token cache + singleflight |
| 1302 | Formalize Working Groups and Interest Groups | not-applicable | process |
| 1303 | Input Validation Errors as Tool Execution Errors | not-applicable | upstream behavior; errors pass through |
| 1319 | Decouple Request Payload from RPC Methods Definition | not-applicable | wire format preserved by passthrough |
| 1330 | Elicitation Enum Schema Improvements | not-applicable | passthrough |
| 1577 | Sampling With Tools | not-applicable | deprecated feature; passes through for legacy peers |
| 1613 | JSON Schema 2020-12 as Default Dialect | not-applicable | tool schemas pass through unvalidated |
| 1686 | Tasks | pending | tasks extension passthrough works single-upstream; federated task routing pending |
| 1699 | SSE polling via server-side disconnect | implemented | streaming passthrough preserves disconnect/poll semantics |
| 1730 | SDKs Tiering System | not-applicable | process |
| 1850 | PR-Based SEP Workflow | not-applicable | process |
| 1865 | MCP Apps | pending | extension passthrough; federated app-resource routing untested |
| 2085 | Governance Succession and Amendment | not-applicable | process |
| 2106 | Tools inputSchema/outputSchema JSON Schema 2020-12 | not-applicable | schemas pass through unvalidated |
| 2133 | Extensions framework | implemented | extension methods route/passthrough like any other; per-extension notes tracked separately |
| 2148 | Contributor Ladder | not-applicable | process |
| 2149 | Group Governance and Charter Template | not-applicable | process |
| 2164 | Standardize Resource Not Found Error Code | not-applicable | upstream error codes pass through |
| 2207 | OIDC-Flavored Refresh Token Guidance | not-applicable | client-side guidance |
| 2243 | HTTP Header Standardization (Mcp-Method/Mcp-Name routing) | implemented | |
| 2260 | Require Server requests associated with Client requests | not-applicable | fold issues no server-initiated requests |
| 2322 | Multi Round-Trip Requests | implemented | transparent passthrough; translation bridge in M4 |
| 2468 | Recommend Issuer (iss) Parameter in Auth Responses | implemented | issuer allowlist checked before any network I/O; iss bound per trusted issuer |
| 2484 | Conformance Tests Required for Final SEPs | not-applicable | process; fold runs the suite in CI |
| 2549 | TTL for List Results | implemented | public-scope caching for federated aggregation; private scope awaits M3 principals; resources/read uncached by design |
| 2567 | Sessionless MCP via Explicit State Handles | implemented | north termination: fold owns legacy sessions, upgrades requests to the modern envelope; sampling/elicitation MRTR parking bridge still pending (deprecated feature) |
| 2575 | Make MCP Stateless | implemented | native stateless passthrough + header fast path; legacy requests internally upgraded to the self-describing envelope |
| 2577 | Deprecate Roots, Sampling, and Logging | not-applicable | gateway passes through for legacy peers during the deprecation window |
| 2596 | Feature Lifecycle and Deprecation Policy | not-applicable | process; drives the legacy bridge removal date |
| 2663 | Tasks Extension | pending | see SEP-1686 |