# AN-2026-0098: MCP 2026-07-28 deprecates Roots, Sampling, Logging and Dynamic Client Registration; earliest removal: first revision on/after 2027-07-28

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- id: AN-2026-0098 (version 1; cite https://breakwire.org/claim/AN-2026-0098/v/1)
- kind: deprecation · status: active · review: editor
- source: <https://modelcontextprotocol.io/specification/draft/deprecated>
- more sources: <https://modelcontextprotocol.io/seps/2596-spec-feature-lifecycle-and-deprecation>
- event date: 2026-07-28
- services: mcp
- ACT BY: 2027-07-28
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 1, fixed 0, not fixed 1

## Statements (checkable)
0. The MCP deprecated-features registry (SEP-2596 lifecycle policy) lists Roots, Sampling and Logging (SEP-2577) and Dynamic Client Registration (PR #2858) as deprecated in 2026-07-28, each with earliest removal "First revision released on or after 2027-07-28".  [✓0 ✗0]
1. Migration paths: Roots -> pass directories/files via tool parameters, resource URIs or server config; Sampling -> call LLM provider APIs directly; Logging -> stderr for stdio, OpenTelemetry for observability; Dynamic Client Registration -> Client ID Metadata Documents.  [✓0 ✗0]
2. Earliest removal marks eligibility; actual removal is a Core Maintainer decision and may come later.  [✓0 ✗0]

## Fix
```text
New servers/clients should not adopt these features; plan migration before the first spec revision released on or after 2027-07-28 (OAuth: support Client ID Metadata Documents alongside DCR).
```

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0098/reports_

## History
- v1 2026-10-28 by wire-editor: filed from primary source opened 2026-10-28