Merge pull request #3316 from ultraworkers/fix/release-sha256-macos

fix(ci): use cross-platform sha256 for macOS and Linux release artifacts

.github/workflows/release.yml

@@ -57,7 +57,7 @@ jobs:
           mkdir -p dist
           cp "target/release/${{ matrix.bin }}" "dist/${{ matrix.artifact_name }}"
           chmod +x "dist/${{ matrix.artifact_name }}"
-          (cd dist && sha256sum "${{ matrix.artifact_name }}" > "${{ matrix.artifact_name }}.sha256")
+          (cd dist && (sha256sum "${{ matrix.artifact_name }}" 2>/dev/null || shasum -a 256 "${{ matrix.artifact_name }}") > "${{ matrix.artifact_name }}.sha256")
 
       - name: Upload workflow artifact
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02

.gitignore

@@ -13,3 +13,5 @@ archive/
 status-help.txt
 # Legacy Python port session scratch artifacts
 .port_sessions/
+# Local agent session state
+.gjc/

.gjc/_session-5e2dd1e8-ea4b-4af1-b56b-89ab7cca4299/runtime/runtime-state.json

@@ -1 +0,0 @@
-{"schema_version":1,"session_id":"5e2dd1e8-ea4b-4af1-b56b-89ab7cca4299","state":"running","ready_for_input":false,"updated_at":"2026-10-12T22:09:30.659Z","current_turn_id":null,"last_turn_id":null,"live":true,"reason":null,"source":"agent_session_event","event":"turn_start","cwd":"/home/bellman/Data/Workspace/gc-task-cc-issue-3257-lane","workdir":"/home/bellman/Data/Workspace/gc-task-cc-issue-3257-lane","branch":null,"session_file":"/home/bellman/.gajaeway/broker/agent/sessions/v2-6fji37qf7ld523ivvoiohlcpmz3nu45m2apxyrkusn5nxczjmouq/2026-10-12T22-04-33-362Z_5e2dd1e8-ea4b-4af1-b56b-89ab7cca4299.jsonl","activity":{"seq":115,"last_activity_at":"2026-10-12T22:09:34.144Z","tool":"bash","phase":"started","outcome":null,"elapsed_ms":null,"active_tool_count":1,"active_tools":[{"tool":"bash","started_at":"2026-10-12T22:09:34.144Z"}],"in_flight":[{"digest":"e603a70efb03b6b2b78c94b704197d26fc8a35113543291a21f68b3b08ca11a9","tool":"bash","started_at":"2026-10-12T22:09:34.144Z"}]}}

.gjc/_session-5e2dd1e8-ea4b-4af1-b56b-89ab7cca4299/runtime/runtime-state.json.lock

@@ -1 +0,0 @@
-{"pid":1,"start_time":"unknown","token":"1a2e8a33-76f2-4175-ac23-1521458f12a2","owner_host_id":"7af2fb0e8e37bd543e3d0bda6f205b56f30077b5a9b77e83208e94ae441315ac","released":true}

.gjc/_session-5e2dd1e8-ea4b-4af1-b56b-89ab7cca4299/runtime/runtime-state.json.lock.transition.owner

@@ -1 +0,0 @@
-{"pid":1,"start_time":"unknown","token":"a1342032-af80-4a49-a783-291bf73bf027","owner_host_id":"7af2fb0e8e37bd543e3d0bda6f205b56f30077b5a9b77e83208e94ae441315ac","released":true}

.gjc/state/sdk/5e2dd1e8-ea4b-4af1-b56b-89ab7cca4299.json

@@ -1,12 +0,0 @@
-{
-  "version": 1,
-  "sessionId": "5e2dd1e8-ea4b-4af1-b56b-89ab7cca4299",
-  "pid": 487360,
-  "host": "127.0.0.1",
-  "port": 37541,
-  "url": "ws://127.0.0.1:37541",
-  "token": "LlIfu_aHH57jfys2Ii0ORMrnu56NLAa1",
-  "startedAt": 1791842673967,
-  "updatedAt": 1791842673967,
-  "stale": false
-}

.gjc/state/sdk/5e2dd1e8-ea4b-4af1-b56b-89ab7cca4299.lifecycle.json

@@ -1 +0,0 @@
-{"effectMarker":"f441857a-f591-474b-b34a-6d89b2bf9feb","incarnation":"linux:159099652","pid":487360}

.gjc/state/sdk/5e2dd1e8-ea4b-4af1-b56b-89ab7cca4299.lifecycle.ready.json

@@ -1 +0,0 @@
-{"effectMarker":"f441857a-f591-474b-b34a-6d89b2bf9feb","incarnation":"linux:159099652","pid":487360}

rust/crates/mock-anthropic-service/src/lib.rs

@@ -13,6 +13,16 @@ use tokio::task::JoinHandle;
 pub const SCENARIO_PREFIX: &str = "PARITY_SCENARIO:";
 pub const DEFAULT_MODEL: &str = "claude-sonnet-4-6";
 
+/// The assistant text the `context_window_retry` scenario finally streams, after
+/// its first request was refused with a context-overflow error. Exposed so a
+/// test can assert on the exact body instead of restating the literal.
+pub const CONTEXT_WINDOW_RETRY_TEXT: &str = "auto compact retry parity complete.";
+
+/// The partial assistant text the `stream_then_error` scenario streams before it
+/// fails the response mid-stream. Exposed so a test can assert on the exact body
+/// instead of restating the literal.
+pub const STREAM_THEN_ERROR_TEXT: &str = "partial response before the stream failed";
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct CapturedRequest {
     pub method: String,
@@ -99,6 +109,8 @@ enum Scenario {
     BashPermissionPromptDenied,
     PluginToolRoundtrip,
     AutoCompactTriggered,
+    ContextWindowRetry,
+    StreamThenError,
     TokenCostReporting,
 }
 
@@ -116,6 +128,8 @@ impl Scenario {
             "bash_permission_prompt_denied" => Some(Self::BashPermissionPromptDenied),
             "plugin_tool_roundtrip" => Some(Self::PluginToolRoundtrip),
             "auto_compact_triggered" => Some(Self::AutoCompactTriggered),
+            "context_window_retry" => Some(Self::ContextWindowRetry),
+            "stream_then_error" => Some(Self::StreamThenError),
             "token_cost_reporting" => Some(Self::TokenCostReporting),
             _ => None,
         }
@@ -134,6 +148,8 @@ impl Scenario {
             Self::BashPermissionPromptDenied => "bash_permission_prompt_denied",
             Self::PluginToolRoundtrip => "plugin_tool_roundtrip",
             Self::AutoCompactTriggered => "auto_compact_triggered",
+            Self::ContextWindowRetry => "context_window_retry",
+            Self::StreamThenError => "stream_then_error",
             Self::TokenCostReporting => "token_cost_reporting",
         }
     }
@@ -149,6 +165,18 @@ async fn handle_connection(
     let scenario = detect_scenario(&request)
         .ok_or_else(|| io::Error::new(io::ErrorKind::InvalidInput, "missing parity scenario"))?;
 
+    // How many times this scenario has already been served *on this endpoint*.
+    // Scenarios that need to behave differently on a retry (reject once, then
+    // succeed) key off this; counting per endpoint keeps the token-counting
+    // preflight on `/v1/messages/count_tokens` from consuming the first attempt.
+    let attempt = {
+        let served = requests.lock().await;
+        served
+            .iter()
+            .filter(|captured| captured.scenario == scenario.name() && captured.path == path)
+            .count()
+    };
+
     requests.lock().await.push(CapturedRequest {
         method,
         path,
@@ -158,7 +186,7 @@ async fn handle_connection(
         raw_body,
     });
 
-    let response = build_http_response(&request, scenario);
+    let response = build_http_response(&request, scenario, attempt);
     socket.write_all(response.as_bytes()).await?;
     Ok(())
 }
@@ -308,7 +336,11 @@ fn flatten_tool_result_content(content: &[api::ToolResultContentBlock]) -> Strin
 }
 
 #[allow(clippy::too_many_lines)]
-fn build_http_response(request: &MessageRequest, scenario: Scenario) -> String {
+fn build_http_response(request: &MessageRequest, scenario: Scenario, attempt: usize) -> String {
+    if let Some(rejection) = context_window_rejection(scenario, attempt) {
+        return rejection;
+    }
+
     let response = if request.stream {
         let body = build_stream_body(request, scenario);
         return http_response(
@@ -329,6 +361,37 @@ fn build_http_response(request: &MessageRequest, scenario: Scenario) -> String {
     )
 }
 
+/// The first request of [`Scenario::ContextWindowRetry`] is refused with a
+/// context-overflow error instead of a streamed answer, so the client's
+/// auto-compact recovery path runs and the *retry* is what produces the
+/// response text. Every later request against the same endpoint succeeds.
+///
+/// HTTP 400 is deliberately chosen: it is not in the client's retryable status
+/// set, so the client surfaces the error rather than silently re-sending it —
+/// which is exactly the situation a real context-overflow rejection creates.
+/// The body carries the `context_window` marker the client greps for.
+fn context_window_rejection(scenario: Scenario, attempt: usize) -> Option<String> {
+    if scenario != Scenario::ContextWindowRetry || attempt > 0 {
+        return None;
+    }
+
+    let body = json!({
+        "type": "error",
+        "error": {
+            "type": "invalid_request_error",
+            "message": "prompt is too long: context_window exceeded for this model",
+        },
+    })
+    .to_string();
+
+    Some(http_response(
+        "400 Bad Request",
+        "application/json",
+        &body,
+        &[("request-id", request_id_for(scenario))],
+    ))
+}
+
 #[allow(clippy::too_many_lines)]
 fn build_stream_body(request: &MessageRequest, scenario: Scenario) -> String {
     match scenario {
@@ -461,6 +524,8 @@ fn build_stream_body(request: &MessageRequest, scenario: Scenario) -> String {
         Scenario::AutoCompactTriggered => {
             final_text_sse_with_usage("auto compact parity complete.", 50_000, 200)
         }
+        Scenario::ContextWindowRetry => final_text_sse(CONTEXT_WINDOW_RETRY_TEXT),
+        Scenario::StreamThenError => stream_then_error_sse(STREAM_THEN_ERROR_TEXT),
         Scenario::TokenCostReporting => {
             final_text_sse_with_usage("token cost reporting parity complete.", 1_000, 500)
         }
@@ -628,6 +693,12 @@ fn build_message_response(request: &MessageRequest, scenario: Scenario) -> Messa
             50_000,
             200,
         ),
+        Scenario::ContextWindowRetry => {
+            text_message_response("msg_context_window_retry", CONTEXT_WINDOW_RETRY_TEXT)
+        }
+        Scenario::StreamThenError => {
+            text_message_response("msg_stream_then_error", STREAM_THEN_ERROR_TEXT)
+        }
         Scenario::TokenCostReporting => text_message_response_with_usage(
             "msg_token_cost_reporting",
             "token cost reporting parity complete.",
@@ -650,6 +721,8 @@ fn request_id_for(scenario: Scenario) -> &'static str {
         Scenario::BashPermissionPromptDenied => "req_bash_permission_prompt_denied",
         Scenario::PluginToolRoundtrip => "req_plugin_tool_roundtrip",
         Scenario::AutoCompactTriggered => "req_auto_compact_triggered",
+        Scenario::ContextWindowRetry => "req_context_window_retry",
+        Scenario::StreamThenError => "req_stream_then_error",
         Scenario::TokenCostReporting => "req_token_cost_reporting",
     }
 }
@@ -971,6 +1044,84 @@ fn final_text_sse(text: &str) -> String {
     body
 }
 
+/// Streams a text block to completion and then fails the response, which is
+/// what a provider does when it dies partway through an answer.
+///
+/// The block is closed before the failure on purpose: the client only flushes
+/// its buffered markdown to the terminal on `content_block_stop`, so without
+/// that frame the partial text would still be sitting in the renderer and the
+/// scenario would not reproduce a turn that streamed text and *then* errored.
+///
+/// The response is cut off in the middle of the failing frame rather than
+/// carrying a complete one. Two things fall out of that, both deliberate.
+///
+/// It is what a provider that dies on the socket actually looks like, and it
+/// keeps the failure in a *later* parser call than the answer text. The whole
+/// response is one `write_all` on the mock's side, so a complete trailing frame
+/// would land in the same read chunk as the deltas — and `SseParser::push`
+/// returns `Err` from inside its frame loop, which discards the events it had
+/// already parsed from that same chunk. The client would then never render the
+/// text at all, and the scenario would be exercising that parser behaviour
+/// instead of the terminal state it is meant to reproduce. A truncated tail
+/// stays in the parser's buffer, so `push` returns the deltas normally and the
+/// failure only surfaces from `finish()`, once the client has consumed every
+/// event ahead of it.
+///
+/// The failure is a frame that does not deserialize — `api::types::StreamEvent`
+/// is `#[serde(tag = "type")]` with no fallback arm, so an unknown frame type or
+/// a truncated payload is an `ApiError::Json`. That is non-retryable, and it is
+/// raised while reading the body rather than while acquiring the response, so the
+/// client reports it on the first attempt rather than retrying.
+fn stream_then_error_sse(text: &str) -> String {
+    let mut body = String::new();
+    append_sse(
+        &mut body,
+        "message_start",
+        json!({
+            "type": "message_start",
+            "message": {
+                "id": unique_message_id(),
+                "type": "message",
+                "role": "assistant",
+                "content": [],
+                "model": DEFAULT_MODEL,
+                "stop_reason": null,
+                "stop_sequence": null,
+                "usage": usage_json(14, 0)
+            }
+        }),
+    );
+    append_sse(
+        &mut body,
+        "content_block_start",
+        json!({
+            "type": "content_block_start",
+            "index": 0,
+            "content_block": {"type": "text", "text": ""}
+        }),
+    );
+    append_sse(
+        &mut body,
+        "content_block_delta",
+        json!({
+            "type": "content_block_delta",
+            "index": 0,
+            "delta": {"type": "text_delta", "text": text}
+        }),
+    );
+    append_sse(
+        &mut body,
+        "content_block_stop",
+        json!({"type": "content_block_stop", "index": 0}),
+    );
+    // No terminating blank line: the frame is still arriving when the provider
+    // drops the connection, so it stays in the client's parser buffer until the
+    // body ends. See the note above for why the failure has to trail the deltas
+    // by a parser call rather than sharing their chunk.
+    body.push_str("event: error\ndata: {\"type\":\"error\",\"error\":{\"type\":\"overloaded_");
+    body
+}
+
 fn final_text_sse_with_usage(text: &str, input_tokens: u32, output_tokens: u32) -> String {
     let mut body = String::new();
     append_sse(

rust/crates/rusty-claude-cli/src/main.rs

@@ -27,6 +27,7 @@ use std::net::TcpListener;
 use std::ops::{Deref, DerefMut};
 use std::path::{Path, PathBuf};
 use std::process::Command;
+use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::mpsc::{self, Receiver, RecvTimeoutError, Sender};
 use std::sync::{Arc, Mutex, OnceLock};
 use std::thread::{self, JoinHandle};
@@ -7702,6 +7703,7 @@ impl LiveCli {
             system_prompt.clone(),
             enable_tools,
             true,
+            TerminalTail::new(),
             allowed_tools.clone(),
             permission_mode,
             None,
@@ -7783,6 +7785,7 @@ impl LiveCli {
     fn prepare_turn_runtime(
         &self,
         emit_output: bool,
+        terminal_tail: TerminalTail,
     ) -> Result<(BuiltRuntime, HookAbortMonitor), Box<dyn std::error::Error>> {
         let hook_abort_signal = runtime::HookAbortSignal::new();
         let runtime = build_runtime(
@@ -7792,6 +7795,7 @@ impl LiveCli {
             self.system_prompt.clone(),
             true,
             emit_output,
+            terminal_tail,
             self.allowed_tools.clone(),
             self.permission_mode,
             None,
@@ -7809,27 +7813,39 @@ impl LiveCli {
     }
 
     fn run_turn(&mut self, input: &str) -> Result<(), Box<dyn std::error::Error>> {
-        let (mut runtime, hook_abort_monitor) = self.prepare_turn_runtime(true)?;
+        let terminal_tail = TerminalTail::new();
+        let (mut runtime, hook_abort_monitor) =
+            self.prepare_turn_runtime(true, terminal_tail.clone())?;
         let mut spinner = Spinner::new();
         let mut stdout = io::stdout();
-        spinner.tick(
-            "🦀 Thinking...",
-            TerminalRenderer::new().color_theme(),
-            &mut stdout,
-        )?;
+        // The animated frame is cursor control: it saves the cursor, rewrites the
+        // current line, and restores the cursor. None of that describes anything
+        // when stdout is a pipe — the escapes survive as literal bytes and the
+        // banner ends up glued to whatever the emitter writes next. Only animate
+        // on a terminal; the one-shot completion line below is plain text and is
+        // emitted either way.
+        if io::stdout().is_terminal() {
+            spinner.tick(
+                "🦀 Thinking...",
+                TerminalRenderer::new().color_theme(),
+                &mut stdout,
+            )?;
+        }
         let mut permission_prompter = CliPermissionPrompter::new(self.permission_mode);
         let result = runtime.run_turn(input, Some(&mut permission_prompter));
         hook_abort_monitor.stop();
         match result {
             Ok(summary) => {
                 self.replace_runtime(runtime)?;
-                // The assistant response was already streamed to the terminal live
-                // during the turn (emit_output = true), so reprinting the full text
-                // here would duplicate the entire message. When text was streamed,
-                // emit a newline first so `spinner.finish`'s line-clear lands on a
-                // fresh line instead of erasing the last streamed line.
-                let final_text = final_assistant_text(&summary);
-                if !final_text.is_empty() {
+                // The emitter owns the terminal during a turn: `emit_output = true`
+                // streams text deltas and echoes tool results live, so the response
+                // must not be printed again here — that was the duplicate output
+                // this PR's predecessor fixed.
+                //
+                // What the emitter may have left behind is a partial line, so ask it
+                // rather than guessing from `final_assistant_text(&summary)`: that
+                // guess is empty for tool-only turns, which still render.
+                if !terminal_tail.at_line_start() {
                     println!();
                 }
                 spinner.finish(
@@ -7849,6 +7865,13 @@ impl LiveCli {
             }
             Err(error) => {
                 runtime.shutdown_plugins()?;
+                // Same ownership rule as the success arm: `fail` clears the current
+                // line, so it may only do so when the emitter stopped on a line
+                // boundary. A turn that streamed text and then failed would
+                // otherwise lose its last partial line to the clear.
+                if !terminal_tail.at_line_start() {
+                    println!();
+                }
                 spinner.fail(
                     "❌ Request failed",
                     TerminalRenderer::new().color_theme(),
@@ -7961,14 +7984,14 @@ impl LiveCli {
 
                         // Build a new runtime with the compacted session and retry
                         let (mut new_runtime, hook_abort_monitor) =
-                            self.prepare_turn_runtime(true)?;
+                            self.prepare_turn_runtime(true, terminal_tail.clone())?;
                         drop(hook_abort_monitor);
 
                         let mut rp = CliPermissionPrompter::new(self.permission_mode);
                         match new_runtime.run_turn(input, Some(&mut rp)) {
                             Ok(summary) => {
                                 self.replace_runtime(new_runtime)?;
-                                if !final_assistant_text(&summary).is_empty() {
+                                if !terminal_tail.at_line_start() {
                                     println!();
                                 }
                                 spinner.finish(
@@ -8053,7 +8076,8 @@ impl LiveCli {
     }
 
     fn run_prompt_compact(&mut self, input: &str) -> Result<(), Box<dyn std::error::Error>> {
-        let (mut runtime, hook_abort_monitor) = self.prepare_turn_runtime(false)?;
+        let (mut runtime, hook_abort_monitor) =
+            self.prepare_turn_runtime(false, TerminalTail::new())?;
         let mut permission_prompter = CliPermissionPrompter::new(self.permission_mode);
         let result = runtime.run_turn(input, Some(&mut permission_prompter));
         hook_abort_monitor.stop();
@@ -8066,7 +8090,8 @@ impl LiveCli {
     }
 
     fn run_prompt_compact_json(&mut self, input: &str) -> Result<(), Box<dyn std::error::Error>> {
-        let (mut runtime, hook_abort_monitor) = self.prepare_turn_runtime(false)?;
+        let (mut runtime, hook_abort_monitor) =
+            self.prepare_turn_runtime(false, TerminalTail::new())?;
         let mut permission_prompter = CliPermissionPrompter::new(self.permission_mode);
         let result = runtime.run_turn(input, Some(&mut permission_prompter));
         hook_abort_monitor.stop();
@@ -8091,7 +8116,8 @@ impl LiveCli {
     }
 
     fn run_prompt_json(&mut self, input: &str) -> Result<(), Box<dyn std::error::Error>> {
-        let (mut runtime, hook_abort_monitor) = self.prepare_turn_runtime(false)?;
+        let (mut runtime, hook_abort_monitor) =
+            self.prepare_turn_runtime(false, TerminalTail::new())?;
         let mut permission_prompter = CliPermissionPrompter::new(self.permission_mode);
         let result = runtime.run_turn(input, Some(&mut permission_prompter));
         hook_abort_monitor.stop();
@@ -8447,6 +8473,7 @@ impl LiveCli {
             self.system_prompt.clone(),
             true,
             true,
+            TerminalTail::new(),
             self.allowed_tools.clone(),
             self.permission_mode,
             None,
@@ -8493,6 +8520,7 @@ impl LiveCli {
             self.system_prompt.clone(),
             true,
             true,
+            TerminalTail::new(),
             self.allowed_tools.clone(),
             self.permission_mode,
             None,
@@ -8523,6 +8551,7 @@ impl LiveCli {
             self.system_prompt.clone(),
             true,
             true,
+            TerminalTail::new(),
             self.allowed_tools.clone(),
             self.permission_mode,
             None,
@@ -8565,6 +8594,7 @@ impl LiveCli {
             self.system_prompt.clone(),
             true,
             true,
+            TerminalTail::new(),
             self.allowed_tools.clone(),
             self.permission_mode,
             None,
@@ -8918,6 +8948,7 @@ impl LiveCli {
                     self.system_prompt.clone(),
                     true,
                     true,
+                    TerminalTail::new(),
                     self.allowed_tools.clone(),
                     self.permission_mode,
                     None,
@@ -8953,6 +8984,7 @@ impl LiveCli {
                     self.system_prompt.clone(),
                     true,
                     true,
+                    TerminalTail::new(),
                     self.allowed_tools.clone(),
                     self.permission_mode,
                     None,
@@ -9047,6 +9079,7 @@ impl LiveCli {
             self.system_prompt.clone(),
             true,
             true,
+            TerminalTail::new(),
             self.allowed_tools.clone(),
             self.permission_mode,
             None,
@@ -9067,6 +9100,7 @@ impl LiveCli {
             self.system_prompt.clone(),
             true,
             true,
+            TerminalTail::new(),
             self.allowed_tools.clone(),
             self.permission_mode,
             None,
@@ -9091,6 +9125,7 @@ impl LiveCli {
             self.system_prompt.clone(),
             enable_tools,
             false,
+            TerminalTail::new(),
             self.allowed_tools.clone(),
             self.permission_mode,
             progress,
@@ -12500,6 +12535,7 @@ fn build_runtime(
     system_prompt: Vec<String>,
     enable_tools: bool,
     emit_output: bool,
+    terminal_tail: TerminalTail,
     allowed_tools: Option<AllowedToolSet>,
     permission_mode: PermissionMode,
     progress_reporter: Option<InternalPromptProgressReporter>,
@@ -12512,6 +12548,7 @@ fn build_runtime(
         system_prompt,
         enable_tools,
         emit_output,
+        terminal_tail,
         allowed_tools,
         permission_mode,
         progress_reporter,
@@ -12528,6 +12565,7 @@ fn build_runtime_with_plugin_state(
     system_prompt: Vec<String>,
     enable_tools: bool,
     emit_output: bool,
+    terminal_tail: TerminalTail,
     allowed_tools: Option<AllowedToolSet>,
     permission_mode: PermissionMode,
     progress_reporter: Option<InternalPromptProgressReporter>,
@@ -12553,6 +12591,7 @@ fn build_runtime_with_plugin_state(
             model,
             enable_tools,
             emit_output,
+            terminal_tail.clone(),
             allowed_tools.clone(),
             tool_registry.clone(),
             progress_reporter,
@@ -12560,6 +12599,7 @@ fn build_runtime_with_plugin_state(
         CliToolExecutor::new(
             allowed_tools.clone(),
             emit_output,
+            terminal_tail,
             tool_registry.clone(),
             mcp_state.clone(),
         ),
@@ -12655,6 +12695,76 @@ impl runtime::PermissionPrompter for CliPermissionPrompter {
     }
 }
 
+/// Tracks whether the shared terminal stream currently sits at the start of a
+/// fresh line.
+///
+/// A turn's streamed assistant text has no trailing newline, and
+/// `Spinner::finish` moves to column 0 and clears the current line — so without
+/// a guard it erases the last thing the emitter rendered. Both writers that
+/// render live during a turn (the assistant/reasoning deltas in
+/// `AnthropicRuntimeClient::consume_stream` and the tool-result blocks in
+/// `CliToolExecutor::execute`) push their bytes
+/// through a `TailTrackingWriter` sharing one of these, which lets the caller
+/// that ends the turn ask the emitter what it actually left on the terminal.
+///
+/// The previous approach inferred this from `final_assistant_text(&summary)`,
+/// which agrees today only because every *other* writer terminates its output
+/// with a newline — tool results go through `stream_markdown` (which appends
+/// one), thinking summaries are written with a trailing newline, and tool-call
+/// headers use `writeln!`. That is a property of the current renderers rather
+/// than of the streaming protocol, and the text path already violates it, so
+/// recording the fact is cheaper than depending on it. The heuristic also left
+/// the failure arm unguarded: a turn that streamed text and then errored still
+/// had that line cleared.
+#[derive(Clone, Default)]
+struct TerminalTail {
+    at_line_start: Arc<AtomicBool>,
+}
+
+impl TerminalTail {
+    fn new() -> Self {
+        Self {
+            at_line_start: Arc::new(AtomicBool::new(true)),
+        }
+    }
+
+    /// True when nothing has been written since the last newline, so clearing
+    /// the current terminal line cannot destroy rendered output.
+    fn at_line_start(&self) -> bool {
+        self.at_line_start.load(Ordering::Relaxed)
+    }
+
+    fn record(&self, written: &[u8]) {
+        if let Some(last) = written.last() {
+            self.at_line_start.store(*last == b'\n', Ordering::Relaxed);
+        }
+    }
+}
+
+/// Forwards writes to `inner` while reporting the tail byte to a `TerminalTail`.
+struct TailTrackingWriter<'a, W: Write> {
+    inner: &'a mut W,
+    tail: TerminalTail,
+}
+
+impl<'a, W: Write> TailTrackingWriter<'a, W> {
+    fn new(inner: &'a mut W, tail: TerminalTail) -> Self {
+        Self { inner, tail }
+    }
+}
+
+impl<W: Write> Write for TailTrackingWriter<'_, W> {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        let written = self.inner.write(buf)?;
+        self.tail.record(&buf[..written]);
+        Ok(written)
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        self.inner.flush()
+    }
+}
+
 // NOTE: Despite the historical name `AnthropicRuntimeClient`, this struct
 // now holds an `ApiProviderClient` which dispatches to Anthropic, xAI,
 // OpenAI, or DashScope at construction time based on
@@ -12668,6 +12778,7 @@ struct AnthropicRuntimeClient {
     model: String,
     enable_tools: bool,
     emit_output: bool,
+    terminal_tail: TerminalTail,
     allowed_tools: Option<AllowedToolSet>,
     tool_registry: GlobalToolRegistry,
     progress_reporter: Option<InternalPromptProgressReporter>,
@@ -12680,6 +12791,7 @@ impl AnthropicRuntimeClient {
         model: String,
         enable_tools: bool,
         emit_output: bool,
+        terminal_tail: TerminalTail,
         allowed_tools: Option<AllowedToolSet>,
         tool_registry: GlobalToolRegistry,
         progress_reporter: Option<InternalPromptProgressReporter>,
@@ -12733,6 +12845,7 @@ impl AnthropicRuntimeClient {
             model,
             enable_tools,
             emit_output,
+            terminal_tail,
             allowed_tools,
             tool_registry,
             progress_reporter,
@@ -12832,8 +12945,9 @@ impl AnthropicRuntimeClient {
             })?;
         let mut stdout = io::stdout();
         let mut sink = io::sink();
+        let mut tracked = TailTrackingWriter::new(&mut stdout, self.terminal_tail.clone());
         let out: &mut dyn Write = if self.emit_output {
-            &mut stdout
+            &mut tracked
         } else {
             &mut sink
         };
@@ -13997,6 +14111,7 @@ fn prompt_cache_record_to_runtime_event(
 struct CliToolExecutor {
     renderer: TerminalRenderer,
     emit_output: bool,
+    terminal_tail: TerminalTail,
     allowed_tools: Option<AllowedToolSet>,
     tool_registry: GlobalToolRegistry,
     mcp_state: Option<Arc<Mutex<RuntimeMcpState>>>,
@@ -14006,12 +14121,14 @@ impl CliToolExecutor {
     fn new(
         allowed_tools: Option<AllowedToolSet>,
         emit_output: bool,
+        terminal_tail: TerminalTail,
         tool_registry: GlobalToolRegistry,
         mcp_state: Option<Arc<Mutex<RuntimeMcpState>>>,
     ) -> Self {
         Self {
             renderer: TerminalRenderer::new(),
             emit_output,
+            terminal_tail,
             allowed_tools,
             tool_registry,
             mcp_state,
@@ -14105,8 +14222,11 @@ impl ToolExecutor for CliToolExecutor {
             Ok(output) => {
                 if self.emit_output {
                     let markdown = format_tool_result(tool_name, &output, false);
+                    let mut stdout = io::stdout();
+                    let mut tracked =
+                        TailTrackingWriter::new(&mut stdout, self.terminal_tail.clone());
                     self.renderer
-                        .stream_markdown(&markdown, &mut io::stdout())
+                        .stream_markdown(&markdown, &mut tracked)
                         .map_err(|error| ToolError::new(error.to_string()))?;
                 }
                 Ok(output)
@@ -14114,8 +14234,11 @@ impl ToolExecutor for CliToolExecutor {
             Err(error) => {
                 if self.emit_output {
                     let markdown = format_tool_result(tool_name, &error.to_string(), true);
+                    let mut stdout = io::stdout();
+                    let mut tracked =
+                        TailTrackingWriter::new(&mut stdout, self.terminal_tail.clone());
                     self.renderer
-                        .stream_markdown(&markdown, &mut io::stdout())
+                        .stream_markdown(&markdown, &mut tracked)
                         .map_err(|stream_error| ToolError::new(stream_error.to_string()))?;
                 }
                 Err(error)
@@ -14430,8 +14553,8 @@ mod tests {
         CliOutputFormat, CliToolExecutor, GitOperation, GitWorkspaceSummary,
         InternalPromptProgressEvent, InternalPromptProgressState, LiveCli, LocalHelpTopic,
         PermissionModeProvenance, PromptHistoryEntry, SessionLifecycleKind,
-        SessionLifecycleSummary, SlashCommand, StatusUsage, TmuxPaneSnapshot, DEFAULT_MODEL,
-        LATEST_SESSION_REFERENCE, STUB_COMMANDS,
+        SessionLifecycleSummary, SlashCommand, StatusUsage, TerminalTail, TmuxPaneSnapshot,
+        DEFAULT_MODEL, LATEST_SESSION_REFERENCE, STUB_COMMANDS,
     };
     use api::{ApiError, MessageResponse, OutputContentBlock, Usage};
     use plugins::{
@@ -19354,6 +19477,7 @@ UU conflicted.rs",
         let mut executor = CliToolExecutor::new(
             None,
             false,
+            TerminalTail::new(),
             state.tool_registry.clone(),
             state.mcp_state.clone(),
         );
@@ -19452,6 +19576,7 @@ UU conflicted.rs",
         let mut executor = CliToolExecutor::new(
             None,
             false,
+            TerminalTail::new(),
             state.tool_registry.clone(),
             state.mcp_state.clone(),
         );
@@ -19512,6 +19637,7 @@ UU conflicted.rs",
             vec!["test system prompt".to_string()],
             true,
             false,
+            TerminalTail::new(),
             None,
             PermissionMode::DangerFullAccess,
             None,

rust/crates/rusty-claude-cli/tests/compact_output.rs

@@ -7,7 +7,9 @@ use std::process::{Command, Output, Stdio};
 use std::sync::atomic::{AtomicU64, Ordering};
 use std::time::{Duration, Instant, SystemTime, UNIX_EPOCH};
 
-use mock_anthropic_service::{MockAnthropicService, SCENARIO_PREFIX};
+use mock_anthropic_service::{
+    MockAnthropicService, CONTEXT_WINDOW_RETRY_TEXT, SCENARIO_PREFIX, STREAM_THEN_ERROR_TEXT,
+};
 use serde_json::Value;
 
 static TEMP_COUNTER: AtomicU64 = AtomicU64::new(0);
@@ -189,6 +191,199 @@ fn text_prompt_mode_streams_assistant_text_once_before_spinner_completion() {
     fs::remove_dir_all(&workspace).expect("workspace cleanup should succeed");
 }
 
+#[test]
+fn text_prompt_mode_emits_the_response_body_exactly_once() {
+    // given a workspace pointed at the mock Anthropic service running the
+    // streaming_text scenario, which emits a single assistant text block
+    let runtime = tokio::runtime::Runtime::new().expect("tokio runtime should build");
+    let server = runtime
+        .block_on(MockAnthropicService::spawn())
+        .expect("mock service should start");
+    let base_url = server.base_url();
+
+    let workspace = unique_temp_dir("text-prompt-once");
+    let config_home = workspace.join("config-home");
+    let home = workspace.join("home");
+    fs::create_dir_all(&workspace).expect("workspace should exist");
+    fs::create_dir_all(&config_home).expect("config home should exist");
+    fs::create_dir_all(&home).expect("home should exist");
+
+    // when we invoke claw in normal text prompt mode
+    let prompt = format!("{SCENARIO_PREFIX}streaming_text");
+    let output = run_claw(
+        &workspace,
+        &config_home,
+        &home,
+        &base_url,
+        &[
+            "--model",
+            "sonnet",
+            "--permission-mode",
+            "read-only",
+            &prompt,
+        ],
+    );
+
+    // then the response body reaches stdout exactly once: the emitter owns the
+    // terminal while the turn runs, so the caller must not print the assistant
+    // text a second time
+    assert!(
+        output.status.success(),
+        "text prompt run should succeed\nstdout:\n{}\n\nstderr:\n{}",
+        String::from_utf8_lossy(&output.stdout),
+        String::from_utf8_lossy(&output.stderr),
+    );
+    let stdout = String::from_utf8(output.stdout).expect("stdout should be utf8");
+    let plain_stdout = strip_ansi_codes(&stdout);
+    assert_eq!(
+        plain_stdout
+            .matches("Mock streaming says hello from the parity harness.")
+            .count(),
+        1,
+        "text prompt stdout should carry the response body exactly once ({stdout:?})"
+    );
+
+    fs::remove_dir_all(&workspace).expect("workspace cleanup should succeed");
+}
+
+#[test]
+fn text_prompt_mode_emits_retried_body_once_after_auto_compact() {
+    // given a mock service whose first answer to this scenario is a context
+    // window rejection and whose answer to the retry is a streamed response
+    let runtime = tokio::runtime::Runtime::new().expect("tokio runtime should build");
+    let server = runtime
+        .block_on(MockAnthropicService::spawn())
+        .expect("mock service should start");
+    let base_url = server.base_url();
+
+    let workspace = unique_temp_dir("text-prompt-auto-compact-retry");
+    let config_home = workspace.join("config-home");
+    let home = workspace.join("home");
+    fs::create_dir_all(&workspace).expect("workspace should exist");
+    fs::create_dir_all(&config_home).expect("config home should exist");
+    fs::create_dir_all(&home).expect("home should exist");
+
+    // when claw is rejected for context window overflow and recovers by
+    // compacting the session and retrying the same prompt
+    let prompt = format!("{SCENARIO_PREFIX}context_window_retry");
+    let output = run_claw(
+        &workspace,
+        &config_home,
+        &home,
+        &base_url,
+        &[
+            "--model",
+            "sonnet",
+            "--permission-mode",
+            "read-only",
+            &prompt,
+        ],
+    );
+
+    // then the retry succeeds and its response body is on stdout exactly once.
+    // The recovery path builds a fresh runtime with its own terminal tail, so
+    // this is where a tail that only tracked the first attempt would leave the
+    // streamed line unterminated and let `spinner.finish` clear it.
+    assert!(
+        output.status.success(),
+        "auto-compact retry should succeed\nstdout:\n{}\n\nstderr:\n{}",
+        String::from_utf8_lossy(&output.stdout),
+        String::from_utf8_lossy(&output.stderr),
+    );
+    let stdout = String::from_utf8(output.stdout).expect("stdout should be utf8");
+    let plain_stdout = strip_ansi_codes(&stdout);
+    assert_eq!(
+        plain_stdout.matches(CONTEXT_WINDOW_RETRY_TEXT).count(),
+        1,
+        "auto-compact retry stdout should carry the response body exactly once ({stdout:?})"
+    );
+    assert!(
+        plain_stdout
+            .lines()
+            .any(|line| line == CONTEXT_WINDOW_RETRY_TEXT),
+        "the retried response body should land on its own line ({stdout:?})"
+    );
+    assert!(
+        plain_stdout.contains("✨ Done (after auto-compact)"),
+        "the retry should report the auto-compact completion ({stdout:?})"
+    );
+
+    // and the scenario really was requested twice, so the retry path ran
+    let captured = runtime.block_on(server.captured_requests());
+    let messages: Vec<_> = captured
+        .iter()
+        .filter(|request| request.path == "/v1/messages")
+        .collect();
+    assert!(
+        messages.len() >= 2,
+        "the scenario should be requested twice so the retry is exercised ({captured:?})"
+    );
+
+    fs::remove_dir_all(&workspace).expect("workspace cleanup should succeed");
+}
+
+#[test]
+fn text_prompt_mode_keeps_streamed_text_when_the_turn_fails() {
+    // given a mock service that streams part of an answer and then fails the
+    // response, so the turn ends with text already rendered on the terminal
+    let runtime = tokio::runtime::Runtime::new().expect("tokio runtime should build");
+    let server = runtime
+        .block_on(MockAnthropicService::spawn())
+        .expect("mock service should start");
+    let base_url = server.base_url();
+
+    let workspace = unique_temp_dir("text-prompt-stream-then-error");
+    let config_home = workspace.join("config-home");
+    let home = workspace.join("home");
+    fs::create_dir_all(&workspace).expect("workspace should exist");
+    fs::create_dir_all(&config_home).expect("config home should exist");
+    fs::create_dir_all(&home).expect("home should exist");
+
+    // when the turn fails after the emitter already streamed a partial line
+    let prompt = format!("{SCENARIO_PREFIX}stream_then_error");
+    let output = run_claw(
+        &workspace,
+        &config_home,
+        &home,
+        &base_url,
+        &[
+            "--model",
+            "sonnet",
+            "--permission-mode",
+            "read-only",
+            &prompt,
+        ],
+    );
+
+    // then the failed turn is reported...
+    assert!(
+        !output.status.success(),
+        "a mid-stream failure should fail the run\nstdout:\n{}\n\nstderr:\n{}",
+        String::from_utf8_lossy(&output.stdout),
+        String::from_utf8_lossy(&output.stderr),
+    );
+    let stdout = String::from_utf8(output.stdout).expect("stdout should be utf8");
+    let plain_stdout = strip_ansi_codes(&stdout);
+
+    // ...and the text the emitter already streamed survives the failure banner.
+    // `spinner.fail` moves to column 0 and clears the current line, so a caller
+    // that does not know a partial line is pending erases that text instead of
+    // printing the banner underneath it. This is the failure arm of the same
+    // ownership rule the success arm follows.
+    assert!(
+        plain_stdout
+            .lines()
+            .any(|line| line == STREAM_THEN_ERROR_TEXT),
+        "the streamed text should keep its own line despite the failure ({stdout:?})"
+    );
+    assert!(
+        plain_stdout.contains("Request failed"),
+        "the failure banner should still be reported ({stdout:?})"
+    );
+
+    fs::remove_dir_all(&workspace).expect("workspace cleanup should succeed");
+}
+
 #[test]
 fn compact_flag_with_json_output_emits_structured_json() {
     let runtime = tokio::runtime::Runtime::new().expect("tokio runtime should build");