refactor(fork): drop sep-2243-draft feature, document Claude-CLI-reality posture

Applies the workspace's Claude-CLI-reality filter to the fork:

- Delete `sep-2243-draft` feature + `crates/rmcp/src/sep2243_draft.rs`
  scaffold entirely. The SEP is still draft, the fork's implementation was
  a scaffold only (no transport plumbing), and Claude CLI does not emit or
  honour the `Mcp-Method` / `Mcp-Name` headers or the `x-mcp-header`
  tool-param promotion. No consumer, no reason to keep.
- Remove `sep-2243-draft` from `crates/rmcp/Cargo.toml` features list and
  docs.rs metadata.
- Fix `docs.anthropic.com` → `docs.claude.com` in the `anthropic_ext`
  module doc.
- Extend `ROADMAP.md` with a fork-specific changes section documenting:
  * What `anthropic-ext` adds (channel + permission relay +
    maxResultSizeChars + structured-with-text-fallback + 2KB lint).
  * What was deleted (sep-2243-draft).
  * What was proposed and rejected (notify_tasks_status, search_tools
    helper, runtime toolset gating) — all lack a Claude-CLI consumer.
  * What's under consideration (#[resource] macros, Origin-header
    validation).

cargo check --all-features + the anthropic-ext feature set both pass.

Author: jrmelsha

ROADMAP.md

@@ -69,3 +69,55 @@ These draft/extension scenarios are tracked but do not count toward tier advance
 | `auth/client-credentials-jwt` | extension | ❌ Failed — JWT `aud` claim verification error |
 | `auth/client-credentials-basic` | extension | ✅ Passed |
 | `auth/cross-app-access-complete-flow` | extension | ❌ Failed — sends `authorization_code` grant instead of `jwt-bearer` |
+
+---
+
+## Fork-specific changes (UserGeneratedLLC fork)
+
+The fork diverges from upstream `modelcontextprotocol/rust-sdk` on Claude Code
+CLI support. Baseline posture: **skills and code carry only what Claude Code
+CLI actually honours**. See the downstream skill
+[`.cursor/skills/create-mcp-primitive/audit-checklist.md`](https://github.com/UserGeneratedLLC/iris/blob/main/.cursor/skills/create-mcp-primitive/audit-checklist.md)
+for the authoritative Claude-CLI-reality anti-pattern list.
+
+### Divergences from upstream
+
+- **Added** — `anthropic-ext` feature: `anthropic/maxResultSizeChars`,
+  `claude/channel` + `claude/channel/permission` capabilities,
+  `notify_claude_channel` + `notify_claude_channel_permission` Peer helpers,
+  `structured_with_text_fallback` helper (Claude Code #41361 workaround),
+  `lint::warn_if_over_2kb` (Claude Code #43474 2 KB truncation cliff).
+
+### Deleted (no Claude-CLI consumer)
+
+- **`sep-2243-draft`** — draft SEP, never implemented in the fork beyond a
+  scaffold; Claude CLI doesn't emit or honour the `Mcp-Method` / `Mcp-Name`
+  headers or the `x-mcp-header` tool-param promotion. Removed 2026-04-23.
+
+### Proposed but rejected
+
+- **`Peer::notify_tasks_status` emitter** — the workspace previously
+  substituted via `notify_logging_message`, but per the Claude-CLI-reality
+  filter both the MCP `tasks/*` primitive and `notifications/message` are
+  unrendered / not implemented client-side (anthropics/claude-code#18617,
+  #3174). No consumer; the workspace deleted both paths instead of adding
+  the emitter.
+- **`search_tools` meta-tool helper** — Claude CLI already defers MCP tools
+  via its built-in client-side Tool Search. Server-side `search_tools` would
+  be redundant for the sole consumer.
+- **Runtime toolset gating à la `github-mcp-server --toolsets`** —
+  `notifications/tools/list_changed` is dropped mid-turn on stdio by Claude
+  CLI (anthropics/claude-code#50515). The existing category-level
+  `LOAD_INITIALLY = false` + `load_tool_group` pattern is sufficient for
+  HTTP consumers; runtime toolset gating on stdio is a no-op.
+
+### Under consideration
+
+- **`#[resource]` + `#[resource_router]` + `#[resource_handler]` macros** —
+  would delete ~300 LOC of hand-rolled `ResourceRouter<S>` boilerplate
+  across the 4 downstream workspace MCPs. Real consumer. Tracked for a
+  future fork PR.
+- **`Origin` header validation** — currently listed above under Tier 1
+  server conformance. `allowed_hosts` covers `Host`; `Origin` needs a
+  first-class `allowed_origins` field on `StreamableHttpServerConfig` to
+  match the 2025-11-25 spec requirement.

crates/rmcp/Cargo.toml

@@ -16,7 +16,6 @@ exhaustive_enums = "warn"
 [package.metadata.docs.rs]
 features = [
   "anthropic-ext",
-  "sep-2243-draft",
   "auth",
   "auth-client-credentials-jwt",
   "base64",
@@ -126,12 +125,6 @@ elicitation = ["dep:url"]
 # the fleet targets Claude Code as the MCP client.
 anthropic-ext = []
 
-# Forward-looking scaffold for SEP-2243 (HTTP Header Standardization, Draft).
-# Exposes header-name constants, `Tool::with_mcp_header_param` builder, and
-# server-side header extraction. Full transport-layer plumbing lands when
-# SEP-2243 finalizes. Off by default.
-sep-2243-draft = []
-
 # reqwest http client
 __reqwest = ["dep:reqwest"]
 

crates/rmcp/src/lib.rs

@@ -7,15 +7,11 @@ mod error;
 pub use error::{Error, ErrorData, RmcpError};
 
 /// Claude Code-specific server extensions (maxResultSizeChars, claude/channel).
-/// See <https://docs.anthropic.com/en/docs/claude-code/mcp>.
+/// See <https://docs.claude.com/en/docs/claude-code/mcp>.
 #[cfg(feature = "anthropic-ext")]
 pub mod anthropic_ext;
 /// Basic data types in MCP specification
 pub mod model;
-/// Forward-looking scaffold for SEP-2243 (HTTP Header Standardization, Draft).
-/// See <https://modelcontextprotocol.io/seps/2243-http-standardization>.
-#[cfg(feature = "sep-2243-draft")]
-pub mod sep2243_draft;
 #[cfg(any(feature = "client", feature = "server"))]
 pub mod service;
 #[cfg(feature = "client")]