diff --git a/crates/blue-core/src/lib.rs b/crates/blue-core/src/lib.rs
index 1cde6b1..689bc05 100644
--- a/crates/blue-core/src/lib.rs
+++ b/crates/blue-core/src/lib.rs
@@ -35,4 +35,4 @@ pub use repo::{detect_blue, BlueHome, RepoError, WorktreeInfo};
 pub use state::{ItemType, ProjectState, StateError, StatusSummary, WorkItem};
 pub use store::{DocType, Document, DocumentStore, FileIndexEntry, IndexSearchResult, IndexStatus, LinkType, Reminder, ReminderStatus, SearchResult, Session, SessionType, StagingLock, StagingLockQueueEntry, StagingLockResult, StoreError, SymbolIndexEntry, Task as StoreTask, TaskProgress, Worktree, INDEX_PROMPT_VERSION};
 pub use voice::*;
-pub use workflow::{PrdStatus, RfcStatus, SpikeOutcome as WorkflowSpikeOutcome, SpikeStatus, WorkflowError};
+pub use workflow::{PrdStatus, RfcStatus, SpikeOutcome as WorkflowSpikeOutcome, SpikeStatus, WorkflowError, validate_rfc_transition};
diff --git a/crates/blue-mcp/src/error.rs b/crates/blue-mcp/src/error.rs
index 1276843..7642cfe 100644
--- a/crates/blue-mcp/src/error.rs
+++ b/crates/blue-mcp/src/error.rs
@@ -27,6 +27,9 @@ pub enum ServerError {
 
     #[error("Not found: {0}")]
     NotFound(String),
+
+    #[error("Workflow error: {0}")]
+    Workflow(String),
 }
 
 impl ServerError {
@@ -41,6 +44,7 @@ impl ServerError {
             ServerError::StateLoadFailed(_) => -32001,
             ServerError::CommandFailed(_) => -32002,
             ServerError::NotFound(_) => -32003,
+            ServerError::Workflow(_) => -32004,
         }
     }
 }
diff --git a/crates/blue-mcp/src/handlers/pr.rs b/crates/blue-mcp/src/handlers/pr.rs
index ff57c33..2301252 100644
--- a/crates/blue-mcp/src/handlers/pr.rs
+++ b/crates/blue-mcp/src/handlers/pr.rs
@@ -14,7 +14,7 @@
 
 use std::process::Command;
 
-use blue_core::{CreatePrOpts, MergeStrategy, ProjectState, create_forge_cached, detect_forge_type_cached, parse_git_url};
+use blue_core::{CreatePrOpts, DocType, MergeStrategy, ProjectState, create_forge_cached, detect_forge_type_cached, parse_git_url};
 use serde_json::{json, Value};
 
 use crate::error::ServerError;
@@ -41,6 +41,36 @@ pub enum TaskCategory {
 pub fn handle_create(state: &ProjectState, args: &Value) -> Result<Value, ServerError> {
     let rfc = args.get("rfc").and_then(|v| v.as_str());
 
+    // If RFC is provided, validate workflow state (RFC 0014)
+    if let Some(rfc_title) = rfc {
+        // Check RFC exists and has worktree
+        if let Ok(doc) = state.store.find_document(DocType::Rfc, rfc_title) {
+            // Warn if RFC isn't implemented yet
+            if doc.status != "implemented" && doc.status != "in-progress" {
+                return Ok(json!({
+                    "status": "error",
+                    "message": blue_core::voice::error(
+                        &format!("RFC '{}' is {} - complete implementation first", rfc_title, doc.status),
+                        "Use blue_rfc_complete after finishing work"
+                    )
+                }));
+            }
+
+            // Check worktree exists
+            if let Some(doc_id) = doc.id {
+                if state.store.get_worktree(doc_id).ok().flatten().is_none() {
+                    return Ok(json!({
+                        "status": "warning",
+                        "message": blue_core::voice::error(
+                            "No worktree for this RFC",
+                            "PRs usually come from worktrees. Proceed with caution."
+                        )
+                    }));
+                }
+            }
+        }
+    }
+
     // If RFC is provided, format title as "RFC NNNN: Title Case Name"
     let title = if let Some(rfc_title) = rfc {
         let (stripped, number) = strip_rfc_number_prefix(rfc_title);
diff --git a/crates/blue-mcp/src/handlers/worktree.rs b/crates/blue-mcp/src/handlers/worktree.rs
index a80396f..4345aca 100644
--- a/crates/blue-mcp/src/handlers/worktree.rs
+++ b/crates/blue-mcp/src/handlers/worktree.rs
@@ -119,17 +119,37 @@ pub fn handle_create(state: &ProjectState, args: &Value) -> Result<Value, Server
         }));
     }
 
+    // Check RFC has a plan (RFC 0014: plan enforcement)
+    let doc_id = doc.id.ok_or(ServerError::InvalidParams)?;
+    let tasks = state
+        .store
+        .get_tasks(doc_id)
+        .map_err(|e| ServerError::StateLoadFailed(e.to_string()))?;
+
+    if tasks.is_empty() {
+        return Ok(json!({
+            "status": "error",
+            "message": blue_core::voice::error(
+                &format!("RFC '{}' needs a plan before creating worktree", title),
+                "Create a plan first with blue_rfc_plan"
+            ),
+            "next_action": {
+                "tool": "blue_rfc_plan",
+                "args": { "title": title },
+                "hint": "Create implementation tasks before starting work"
+            }
+        }));
+    }
+
     // Check if worktree already exists
-    if let Some(id) = doc.id {
-        if let Ok(Some(_existing)) = state.store.get_worktree(id) {
-            return Ok(json!({
-                "status": "error",
-                "message": blue_core::voice::error(
-                    &format!("Worktree for '{}' already exists", title),
-                    "Use blue_worktree_list to see active worktrees"
-                )
-            }));
-        }
+    if let Ok(Some(_existing)) = state.store.get_worktree(doc_id) {
+        return Ok(json!({
+            "status": "error",
+            "message": blue_core::voice::error(
+                &format!("Worktree for '{}' already exists", title),
+                "Use blue_worktree_list to see active worktrees"
+            )
+        }));
     }
 
     // Create branch name and worktree path (RFC 0007: strip number prefix)
@@ -144,16 +164,14 @@ pub fn handle_create(state: &ProjectState, args: &Value) -> Result<Value, Server
             match blue_core::repo::create_worktree(&repo, &branch_name, &worktree_path) {
                 Ok(()) => {
                     // Record in store
-                    if let Some(doc_id) = doc.id {
-                        let wt = StoreWorktree {
-                            id: None,
-                            document_id: doc_id,
-                            branch_name: branch_name.clone(),
-                            worktree_path: worktree_path.display().to_string(),
-                            created_at: None,
-                        };
-                        let _ = state.store.add_worktree(&wt);
-                    }
+                    let wt = StoreWorktree {
+                        id: None,
+                        document_id: doc_id,
+                        branch_name: branch_name.clone(),
+                        worktree_path: worktree_path.display().to_string(),
+                        created_at: None,
+                    };
+                    let _ = state.store.add_worktree(&wt);
 
                     // Update RFC status to in-progress if accepted
                     if doc.status == "accepted" {
@@ -479,4 +497,23 @@ mod tests {
         assert_eq!(stripped, "0007feature");
         assert_eq!(number, None);
     }
+
+    #[test]
+    fn test_worktree_requires_plan() {
+        use blue_core::{Document, ProjectState};
+
+        let state = ProjectState::for_test();
+
+        // Create an accepted RFC without a plan
+        let mut doc = Document::new(DocType::Rfc, "test-rfc", "accepted");
+        doc.number = Some(1);
+        state.store.add_document(&doc).unwrap();
+
+        // Try to create worktree - should fail due to missing plan
+        let args = serde_json::json!({ "title": "test-rfc" });
+        let result = handle_create(&state, &args).unwrap();
+
+        assert_eq!(result["status"], "error");
+        assert!(result["message"].as_str().unwrap().contains("needs a plan"));
+    }
 }
diff --git a/crates/blue-mcp/src/server.rs b/crates/blue-mcp/src/server.rs
index d775aaf..3b363f2 100644
--- a/crates/blue-mcp/src/server.rs
+++ b/crates/blue-mcp/src/server.rs
@@ -9,7 +9,7 @@ use serde::Deserialize;
 use serde_json::{json, Value};
 use tracing::{debug, info};
 
-use blue_core::{detect_blue, DocType, Document, ProjectState, Rfc};
+use blue_core::{detect_blue, DocType, Document, ProjectState, Rfc, RfcStatus, validate_rfc_transition};
 
 use crate::error::ServerError;
 
@@ -2398,39 +2398,68 @@ impl BlueServer {
             .and_then(|v| v.as_str())
             .ok_or(ServerError::InvalidParams)?;
 
-        let status = args
+        let status_str = args
             .get("status")
             .and_then(|v| v.as_str())
             .ok_or(ServerError::InvalidParams)?;
 
         let state = self.ensure_state()?;
 
-        // Find the document to get its file path
+        // Find the document to get its file path and current status
         let doc = state.store.find_document(DocType::Rfc, title)
             .map_err(|e| ServerError::StateLoadFailed(e.to_string()))?;
 
+        // Parse statuses and validate transition (RFC 0014)
+        let current_status = RfcStatus::parse(&doc.status)
+            .map_err(|e| ServerError::Workflow(e.to_string()))?;
+        let target_status = RfcStatus::parse(status_str)
+            .map_err(|e| ServerError::Workflow(e.to_string()))?;
+
+        // Validate the transition
+        validate_rfc_transition(current_status, target_status)
+            .map_err(|e| ServerError::Workflow(e.to_string()))?;
+
         // Check for worktree if going to in-progress (RFC 0011)
         let has_worktree = state.has_worktree(title);
-        let worktree_warning = if status == "in-progress" && !has_worktree {
+        let worktree_warning = if status_str == "in-progress" && !has_worktree {
             Some("No worktree exists for this RFC. Consider using blue_worktree_create for isolated development.")
         } else {
             None
         };
 
         // Update database
-        state.store.update_document_status(DocType::Rfc, title, status)
+        state.store.update_document_status(DocType::Rfc, title, status_str)
             .map_err(|e| ServerError::StateLoadFailed(e.to_string()))?;
 
         // Update markdown file (RFC 0008)
         let file_updated = if let Some(ref file_path) = doc.file_path {
             let full_path = state.home.docs_path.join(file_path);
-            blue_core::update_markdown_status(&full_path, status).unwrap_or(false)
+            blue_core::update_markdown_status(&full_path, status_str).unwrap_or(false)
         } else {
             false
         };
 
+        // Conversational hints guide Claude to next action (RFC 0014)
+        let hint = match target_status {
+            RfcStatus::Accepted => Some(
+                "RFC accepted. Ask the user: 'Ready to begin implementation? \
+                 I'll create a worktree and set up the environment.'"
+            ),
+            RfcStatus::InProgress => Some(
+                "Implementation started. Work in the worktree, mark plan tasks \
+                 as you complete them."
+            ),
+            RfcStatus::Implemented => Some(
+                "Implementation complete. Ask the user: 'Ready to create a PR?'"
+            ),
+            RfcStatus::Superseded => Some(
+                "RFC superseded. The newer RFC takes precedence."
+            ),
+            RfcStatus::Draft => None,
+        };
+
         // Build next_action for accepted status (RFC 0011)
-        let next_action = if status == "accepted" {
+        let next_action = if status_str == "accepted" {
             Some(json!({
                 "tool": "blue_worktree_create",
                 "args": { "title": title },
@@ -2443,11 +2472,11 @@ impl BlueServer {
         let mut response = json!({
             "status": "success",
             "title": title,
-            "new_status": status,
+            "new_status": status_str,
             "file_updated": file_updated,
             "message": blue_core::voice::success(
-                &format!("Updated '{}' to {}", title, status),
-                None
+                &format!("Updated '{}' to {}", title, status_str),
+                hint
             )
         });