feat(code): drop TodoListMiddleware - #4685
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Mason Daugherty (mdrxy) merged 7 commits intoJul 13, 2026
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…E_EXPERIMENTAL` `create_deep_agent` always injects `TodoListMiddleware` (and its `write_todos` tool) with no parameter to disable it. When `DEEPAGENTS_CODE_EXPERIMENTAL` is truthy, dcode now threads a tool-less no-op middleware named `TodoListMiddleware` into the agent and subagent middleware lists; the SDK's name-based merge replaces the real middleware, dropping `write_todos`. Off by default, so behavior is unchanged unless the flag is set. Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>
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TodoListMiddleware behind DEEPAGENTS_CODE_EXPERIMENTALTodoListMiddleware
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> [!CAUTION] > Merging this PR will automatically publish to **PyPI** and create a **GitHub release**. For the full release process, see [`.github/RELEASING.md`](https://github.com/langchain-ai/deepagents/blob/main/.github/RELEASING.md). --- _Release notes preview: keep this section in sync with the package `CHANGELOG.md`. The published GitHub release body is extracted from the merged `CHANGELOG.md` by `release.yml`, not from this PR description._ --- ## [0.1.38](deepagents-code==0.1.37...deepagents-code==0.1.38) (2026-07-14) ### Features * Improve `/goal` criteria UX ([#4694](#4694)) ([06f46ff](06f46ff)) * Add interactive goal management ([#4693](#4693)) ([64205e2](64205e2)) * Conditionally drop `TodoListMiddleware` ([#4685](#4685)) ([d3a3077](d3a3077)) * Add `memory.auto_save` config flag ([#4700](#4700)) ([55b60ca](55b60ca)) * Trace experimental mode in metadata ([#4705](#4705)) ([22d5045](22d5045)) ### Bug Fixes * Align context diff rows with changed rows ([#4714](#4714)) ([f9915db](f9915db)) * Hydrate virtualized transcript on scroll offset changes ([#4646](#4646)) ([f77eeb0](f77eeb0)) * Keep TODO and edit tools expanded ([#4704](#4704)) ([1d549d3](1d549d3)) * Make `/goal` completion and grading reliable ([#4691](#4691)) ([9da63c6](9da63c6)) * Preflight Ollama host reachability before discovery probe ([#4702](#4702)) ([96fe71a](96fe71a)) * Quiet expected non-repo `git ls-files` logging ([#4701](#4701)) ([3d499db](3d499db)) * Rename `ls_agent_kind` to `ls_agent_purpose` ([#4708](#4708)) ([2678b16](2678b16)) * Run MCP login during a run, queue the restart ([#4643](#4643)) ([65e1ee8](65e1ee8)) * Show "Took <duration>" when `task` tool completes ([#4638](#4638)) ([19538e0](19538e0)) * Support unambiguous `read_file` gutters ([#4711](#4711)) ([2089b54](2089b54)) --- _End release notes preview._ --- > [!NOTE] > A **New Contributors** section is appended to the GitHub release notes automatically at publish time (see [Release Pipeline](https://github.com/langchain-ai/deepagents/blob/main/.github/RELEASING.md#release-pipeline), step 2). --------- Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Mason Daugherty <github@mdrxy.com>
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dcode no longer exposes the `write_todos` tool / todo-list middleware to the agent or its subagents when `DEEPAGENTS_CODE_EXPERIMENTAL` is set. --- `dcode` builds its agent with `create_deep_agent`, which always injects the SDK's `TodoListMiddleware` (and its `write_todos` tool) and exposes no parameter to disable it. Because `create_deep_agent`'s `_apply_custom_middleware` merge replaces a default middleware in place when a caller middleware shares its `.name`, we add a tool-less no-op middleware named `TodoListMiddleware` and thread it into the main-agent and subagent middleware lists — so the real middleware (and `write_todos`) is dropped without any SDK change. This is gated behind the new `DEEPAGENTS_CODE_EXPERIMENTAL` env var and is a no-op when unset, so default behavior is unchanged. Kept intentionally narrow: the todo prompt guidance and TUI rendering are left in place (dead only when the flag is on). Made by [Open SWE](https://openswe.vercel.app/agents/c5e51661-6737-cd07-a93a-30847caeef06) ## References - Plan: https://openswe.vercel.app/agents/c5e51661-6737-cd07-a93a-30847caeef06/plan --------- Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>
Marcelo5444
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Jul 30, 2026
> [!CAUTION] > Merging this PR will automatically publish to **PyPI** and create a **GitHub release**. For the full release process, see [`.github/RELEASING.md`](https://github.com/langchain-ai/deepagents/blob/main/.github/RELEASING.md). --- _Release notes preview: keep this section in sync with the package `CHANGELOG.md`. The published GitHub release body is extracted from the merged `CHANGELOG.md` by `release.yml`, not from this PR description._ --- ## [0.1.38](langchain-ai/deepagents@deepagents-code==0.1.37...deepagents-code==0.1.38) (2026-07-14) ### Features * Improve `/goal` criteria UX ([langchain-ai#4694](langchain-ai#4694)) ([06f46ff](langchain-ai@06f46ff)) * Add interactive goal management ([langchain-ai#4693](langchain-ai#4693)) ([64205e2](langchain-ai@64205e2)) * Conditionally drop `TodoListMiddleware` ([langchain-ai#4685](langchain-ai#4685)) ([d3a3077](langchain-ai@d3a3077)) * Add `memory.auto_save` config flag ([langchain-ai#4700](langchain-ai#4700)) ([55b60ca](langchain-ai@55b60ca)) * Trace experimental mode in metadata ([langchain-ai#4705](langchain-ai#4705)) ([22d5045](langchain-ai@22d5045)) ### Bug Fixes * Align context diff rows with changed rows ([langchain-ai#4714](langchain-ai#4714)) ([f9915db](langchain-ai@f9915db)) * Hydrate virtualized transcript on scroll offset changes ([langchain-ai#4646](langchain-ai#4646)) ([f77eeb0](langchain-ai@f77eeb0)) * Keep TODO and edit tools expanded ([langchain-ai#4704](langchain-ai#4704)) ([1d549d3](langchain-ai@1d549d3)) * Make `/goal` completion and grading reliable ([langchain-ai#4691](langchain-ai#4691)) ([9da63c6](langchain-ai@9da63c6)) * Preflight Ollama host reachability before discovery probe ([langchain-ai#4702](langchain-ai#4702)) ([96fe71a](langchain-ai@96fe71a)) * Quiet expected non-repo `git ls-files` logging ([langchain-ai#4701](langchain-ai#4701)) ([3d499db](langchain-ai@3d499db)) * Rename `ls_agent_kind` to `ls_agent_purpose` ([langchain-ai#4708](langchain-ai#4708)) ([2678b16](langchain-ai@2678b16)) * Run MCP login during a run, queue the restart ([langchain-ai#4643](langchain-ai#4643)) ([65e1ee8](langchain-ai@65e1ee8)) * Show "Took <duration>" when `task` tool completes ([langchain-ai#4638](langchain-ai#4638)) ([19538e0](langchain-ai@19538e0)) * Support unambiguous `read_file` gutters ([langchain-ai#4711](langchain-ai#4711)) ([2089b54](langchain-ai@2089b54)) --- _End release notes preview._ --- > [!NOTE] > A **New Contributors** section is appended to the GitHub release notes automatically at publish time (see [Release Pipeline](https://github.com/langchain-ai/deepagents/blob/main/.github/RELEASING.md#release-pipeline), step 2). --------- Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Mason Daugherty <github@mdrxy.com>
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dcode no longer exposes the
write_todostool / todo-list middleware to the agent or its subagents whenDEEPAGENTS_CODE_EXPERIMENTALis set.dcodebuilds its agent withcreate_deep_agent, which always injects the SDK'sTodoListMiddleware(and itswrite_todostool) and exposes no parameter to disable it. Becausecreate_deep_agent's_apply_custom_middlewaremerge replaces a default middleware in place when a caller middleware shares its.name, we add a tool-less no-op middleware namedTodoListMiddlewareand thread it into the main-agent and subagent middleware lists — so the real middleware (andwrite_todos) is dropped without any SDK change.This is gated behind the new
DEEPAGENTS_CODE_EXPERIMENTALenv var and is a no-op when unset, so default behavior is unchanged. Kept intentionally narrow: the todo prompt guidance and TUI rendering are left in place (dead only when the flag is on).Made by Open SWE
References