settle child agents before closing sessions at wind-down

Every error path cancels the agent subtree before returning, so children unwind
while their sessions are still open. The success path did not: when root called
finish_scan with children still mid-turn, the finally closed their sessions
underneath them, the in-flight save raised "SQLiteSession is closed", and those
children were marked crashed - failing a scan whose report was already written.

Cancelling the descendants moves into the finally, ahead of the session close,
so it runs on every path - clean finish included. The per-branch cancels are
dropped since the finally now covers them; each branch keeps only its own root
status. cancel_descendants targets child tasks (root runs inline with no task),
and the finally already awaits snapshot and cleanup under cancellation, so the
added await is safe there.

Fixes #1012.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

containers/Dockerfile

@@ -117,21 +117,6 @@ ENV AGENT_BROWSER_EXECUTABLE_PATH=/usr/bin/chromium
 ENV AGENT_BROWSER_USER_AGENT="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"
 ENV AGENT_BROWSER_ARGS="--disable-blink-features=AutomationControlled,--no-first-run,--no-default-browser-check,--lang=en-US"
 ENV AGENT_BROWSER_SCREENSHOT_DIR=/workspace/.agent-browser-screenshots
-ENV AGENT_BROWSER_IDLE_TIMEOUT_MS=180000
-USER root
-RUN set -eu; \
-    { \
-        for var in AGENT_BROWSER_EXECUTABLE_PATH AGENT_BROWSER_USER_AGENT \
-                   AGENT_BROWSER_ARGS AGENT_BROWSER_SCREENSHOT_DIR \
-                   AGENT_BROWSER_IDLE_TIMEOUT_MS; do \
-            eval "value=\${$var}"; \
-            printf 'export %s="${%s:-%s}"\n' "$var" "$var" "$value"; \
-        done; \
-    } > /tmp/agent-browser.sh; \
-    install -m 0644 /tmp/agent-browser.sh /etc/profile.d/agent-browser.sh; \
-    rm /tmp/agent-browser.sh; \
-    env -i bash -lc 'test "${AGENT_BROWSER_IDLE_TIMEOUT_MS}" = "180000"'
-USER pentester
 RUN /home/pentester/.npm-global/bin/agent-browser doctor --offline --quick
 
 RUN set -eux; \

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "strix-agent"
-version = "1.5.2"
+version = "1.5.1"
 description = "Open-source AI Hackers for your apps"
 readme = "README.md"
 license = "Apache-2.0"

strix/agents/prompts/system_prompt.jinja

@@ -263,13 +263,7 @@ Remember: A single well-validated high-impact vulnerability is worth more than d
 <multi_agent_system>
 AGENT ISOLATION & SANDBOXING:
 - All agents run in the same shared Docker container for efficiency
-- Each agent has its own terminal sessions
-- Browsers are NOT per-agent by default: `agent-browser` with no `--session` is one
-  shared browser, so a concurrent agent's navigation invalidates your page and refs.
-  Pass `--session <your-agent-name>` for any browser work of your own — then it is
-  yours alone. Each session is a full Chromium (~340 MB) on this shared box, so keep
-  one, not several, and `agent-browser --session <name> close` when you're done with
-  the target; an idle browser is reclaimed automatically after 3 minutes
+- Each agent has its own: browser sessions, terminal sessions
 - All agents share the same /workspace directory and proxy history
 - Agents can see each other's files and proxy traffic for better collaboration
 

strix/core/inputs.py

@@ -201,10 +201,9 @@ def make_model_settings(
     request_timeout: float | None = None,
     prompt_cache: bool = True,
     extra_headers: dict[str, str] | None = None,
-    has_tools: bool = True,
 ) -> ModelSettings:
     model_settings = ModelSettings(
-        parallel_tool_calls=False if has_tools else None,
+        parallel_tool_calls=False,
         retry=DEFAULT_MODEL_RETRY,
         include_usage=True,
         extra_args=request_timeout_extra_args(request_timeout),

strix/interface/main.py

@@ -224,7 +224,6 @@ async def warm_up_llm(show_model_warning: bool = True) -> None:
                 request_timeout=llm.timeout,
                 prompt_cache=False,
                 extra_headers=settings.dedupe.extra_headers,
-                has_tools=False,
             )
             if deduper_extra:
                 merged = {**(deduper_settings.extra_args or {}), **deduper_extra}

strix/interface/scan_setup.py

@@ -78,7 +78,6 @@ async def preflight_model_connection(
         request_timeout=resolved_settings.llm.timeout,
         prompt_cache=False,
         extra_headers=resolved_settings.llm.extra_headers,
-        has_tools=False,
     )
     await asyncio.wait_for(
         model.get_response(

strix/llm/compaction.py

@@ -294,7 +294,6 @@ async def _summarize(model: str, prompt: str, max_tokens: int) -> str | None:
         request_timeout=llm.timeout,
         prompt_cache=False,
         extra_headers=llm.extra_headers,
-        has_tools=False,
     ).resolve(ModelSettings(max_tokens=max_tokens))
     try:
         response = (

strix/report/dedupe.py

@@ -62,7 +62,6 @@ def _dedupe_model_settings(
         # must never receive the main endpoint's credentials. A dedicated model
         # gets its own DEDUPE_LLM_EXTRA_HEADERS instead.
         extra_headers=dedupe.extra_headers if dedupe.model else llm.extra_headers,
-        has_tools=False,
     )
     extra = _dedupe_extra_args(dedupe)
     if extra:

strix/skills/tooling/agent_browser.md

@@ -58,26 +58,6 @@ agent-browser screenshot
 The browser stays running across commands so these feel like a single
 session. Use `agent-browser close` (or `close --all`) when you're done.
 
-The default session is **shared with every other agent in the sandbox** — if
-another agent navigates it, your page and your refs are gone from under you. So
-claim your own by passing `--session <your-agent-name>` on **every** command:
-
-```bash
-agent-browser --session recon-3 open https://example.com
-agent-browser --session recon-3 snapshot -i
-agent-browser --session recon-3 close        # when done with the target
-```
-
-The examples in the rest of this skill omit `--session` to keep them readable;
-keep passing yours. Each session is a separate Chromium (~340 MB) on a shared
-box, so hold one rather than several, and close it when you're finished.
-
-A browser left idle for 3 minutes is reclaimed automatically to free memory for
-the other agents; the next command relaunches it, but the page, tabs, refs and
-cookies are gone. If you're authenticated and about to go do something else for a
-while, save the state first (see
-[Persist session across runs](#persist-session-across-runs)).
-
 ## Reading a page
 
 ```bash
@@ -327,16 +307,6 @@ agent-browser --session b fill @e1 "bob@test.com"
 `AGENT_BROWSER_SESSION=myapp` sets the default session for the current
 shell.
 
-Use a session named after yourself for your own work — that's what keeps a
-concurrent agent from navigating the page out from under you. Every session is a
-separate Chromium though, so hold one at a time rather than a collection, and
-close each one when its flow is finished:
-
-```bash
-agent-browser --session a close
-agent-browser --session b close
-```
-
 ### Mock network requests
 
 ```bash
@@ -398,11 +368,8 @@ agent-browser dialog dismiss          # cancel
 ## Readiness & recovery
 
 The first `agent-browser open` in a session launches the headless-Chrome
-daemon; later commands reuse it. A daemon left idle for 3 minutes shuts itself
-down to free memory for the other agents, so an `open` after a long gap is a
-fresh browser rather than a resumed one — expect to re-navigate, and re-`state
-load` if you were logged in. Distinguish the failure modes and react differently
-— do **not** blindly re-run the same failing command in a loop:
+daemon; later commands reuse it. Distinguish the two failure modes and react
+differently — do **not** blindly re-run the same failing command in a loop:
 
 - **Daemon / connection failure** (`Failed to connect`, `connection refused`,
   socket missing, `browser not running`): the daemon isn't up or has died. Run

tests/test_inputs.py

@@ -299,16 +299,6 @@ def test_make_model_settings_forces_required_for_anyllm_routed_openai_model() ->
     assert settings.tool_choice == "required"
 
 
-def test_make_model_settings_disables_parallel_tool_calls_by_default() -> None:
-    assert make_model_settings("none", model_name="gpt-4o").parallel_tool_calls is False
-
-
-def test_make_model_settings_omits_parallel_tool_calls_without_tools() -> None:
-    settings = make_model_settings("none", model_name="gpt-4o", has_tools=False)
-
-    assert settings.parallel_tool_calls is None
-
-
 def test_make_model_settings_sets_request_timeout() -> None:
     settings = make_model_settings(
         "none",

uv.lock

@@ -2378,7 +2378,7 @@ wheels = [
 
 [[package]]
 name = "strix-agent"
-version = "1.5.2"
+version = "1.5.1"
 source = { editable = "." }
 dependencies = [
     { name = "caido-sdk-client" },