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feat: update xgrammar==0.2.0 to use structural tags for strict tool calling + reasoning for more models#40894

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feat: update xgrammar==0.2.0 to use structural tags for strict tool calling + reasoning for more models#40894
vllm-bot merged 44 commits into
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Seven-Streams:main-dev/2026-03-25/new_stag

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@Seven-Streams Seven-Streams commented Apr 26, 2026

Purpose

This PR updates the version of xgrammar to v0.2.0 to utilize the latest feature of xgrammar: built-in structural_tags to provide structured generation for more models' tool calling.

Test Plan

The tests are added in the tests/tool_parsers/test_qwen3coder_tool_parser.py, which can be run with pytest.

Test Result

The tests are passed.

Evaluation of the improvement of the model structural tags on function-calling tasks. The results are as follows:

Model Setting Benchmark Correct Call Rate Correct Schema Rate
Qwen3.6-27B w stag BFCL-v3 simple (N=100) 0.94 1
Qwen3.6-27B w/o stag BFCL-v3 simple (N=100) 0.90 0.9375
Qwen3.6-35B-A3B w stag BFCL-v3 simple (N=400) 0.9075 1
Qwen3.6-35B-A3B w/o stag BFCL-v3 simple (N=400) 0.8155 0.9134

The scripts are here: correctness eval.


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  • (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.
  • (Optional) Release notes update. If your change is user facing, please update the release notes draft in the Google Doc.

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@mergify mergify Bot added deepseek Related to DeepSeek models qwen Related to Qwen models tool-calling labels Apr 26, 2026
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mergify Bot commented Apr 26, 2026

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @Seven-Streams.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

@mergify mergify Bot added the needs-rebase label Apr 26, 2026
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Code Review

This pull request implements xgrammar's built-in tool calling support across several tool parsers, including DeepSeekV32, KimiK2, OpenAI, and Qwen3Coder, by adding structural tag generation logic. The AbstractToolParser was modified to incorporate these tags into the request adjustment process. Review feedback suggests refining the structured_outputs assignment to avoid overwriting existing configurations and correcting a method name reference in an error message.

Comment on lines +101 to +103
request.structured_outputs = StructuredOutputsParams(
structural_tag=json.dumps(structure_tag.model_dump()),
)
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high

Overwriting request.structured_outputs with a new StructuredOutputsParams instance will discard any existing structured output settings (such as regex or json derived from response_format). It is safer to update the existing structured_outputs object if it is already present, or only create a new one if it is None. This ensures that other sampling parameters are preserved.

        if request.structured_outputs is None:
            request.structured_outputs = StructuredOutputsParams(
                structural_tag=json.dumps(structure_tag.model_dump()),
            )
        else:
            request.structured_outputs.structural_tag = json.dumps(
                structure_tag.model_dump())

self, request: ChatCompletionRequest
) -> StructuralTag:
raise NotImplementedError(
"ToolParser.get_xgrammar_builtin_structural_tag is not implemented"
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high

The error message refers to get_xgrammar_builtin_structural_tag, but the method name is actually get_structural_tag. This mismatch can be confusing for developers implementing new tool parsers.

Suggested change
"ToolParser.get_xgrammar_builtin_structural_tag is not implemented"
"ToolParser.get_structural_tag is not implemented"

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cjackal commented Apr 26, 2026

Structural tag is one of the most powerful features from xgrammar, good to see it default in vllm! I just wonder - it seems not all model architectures that xgrammar has a structural tag template are included in this PR (e.g. glm47 is missing in particular), is there a specific reason for that? Or we can just incrementally add up the supported models?

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aarnphm commented Apr 27, 2026

Structural tag is one of the most powerful features from xgrammar, good to see it default in vllm! I just wonder - it seems not all model architectures that xgrammar has a structural tag template are included in this PR (e.g. glm47 is missing in particular), is there a specific reason for that? Or we can just incrementally add up the supported models?

We can add incremental support afterward.

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aarnphm commented Apr 27, 2026

cc @sfeng33 and @chaunceyjiang I think the API surface for the tool parser looks good, unless you have opinion otherwise

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  1. I'm curious if you have run these affected models e2e to test for correctness on the tag itself?
  2. If you set a non-xgrammar backend, would it break?
  3. These structural tag guided decoding would be applied to the whole model output, would it be compatible if there is also reasoning?

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Structural tag is one of the most powerful features from xgrammar, good to see it default in vllm! I just wonder - it seems not all model architectures that xgrammar has a structural tag template are included in this PR (e.g. glm47 is missing in particular), is there a specific reason for that? Or we can just incrementally add up the supported models?

No specific reasons, others can be added incrementally later.

  1. I'm curious if you have run these affected models e2e to test for correctness on the tag itself?
  2. If you set a non-xgrammar backend, would it break?
  3. These structural tag guided decoding would be applied to the whole model output, would it be compatible if there is also reasoning?
  1. I've tested it only for some small models, since I do not have enough servers.
  2. yes, it will. maybe we can disable it when non-xgrammar backend is set.
  3. it is compatible with reasoning, here is xgrammar's doc about tool_calling and reasoning for your reference.

@Seven-Streams Seven-Streams marked this pull request as draft April 28, 2026 11:54
Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>

finish the support for vllm with xgr built-in stag.

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>

refactor.

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>

fix.

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>

fix the detection for the thinking mode.

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>

add test.

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>

refactor the structure.

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>

rename the symbols.

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>

add the support for more models.

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>
Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>
Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>
@Seven-Streams Seven-Streams force-pushed the main-dev/2026-03-25/new_stag branch from 5dd5b89 to 5a984a1 Compare April 28, 2026 14:29
@mergify mergify Bot removed the needs-rebase label Apr 28, 2026
Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>
Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>
Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>
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cjackal commented Apr 29, 2026

Seems we also need to bump minimum requirement for xgrammar to 0.1.34 to have xgrammar.get_model_structural_tag function?

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>
This reverts commit db9ccc6.
Seven-Streams and others added 2 commits May 4, 2026 09:34
Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>
Signed-off-by: Ubospica <ubospica@gmail.com>
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mergify Bot commented May 4, 2026

Hi @Seven-Streams, the pre-commit checks have failed. Please run:

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pre-commit run --all-files

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Hi @Seven-Streams, the pre-commit checks have failed. Please run:

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pre-commit run --all-files

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Thank you for making the changes, LGTM, I've retried the failing tests.

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sfeng33 commented May 4, 2026

Hey @Ubospica, can you please fix DCO on your commits?

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mgoin commented May 4, 2026

We can manually approve the DCO, so I wouldn't worry about fixing it. It is easy to mess up commit history

@mgoin mgoin changed the title feat: use structural tags to enable strict tool calling and reasoning for more models feat: update xgrammar==0.2.0 to use structural tags for strict tool calling + reasoning for more models May 4, 2026
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sfeng33 commented May 4, 2026

The test failure in async-engine-inputs-utils-worker-config-cpu is related.

Signed-off-by: sfeng33 <4florafeng@gmail.com>
@vllm-bot vllm-bot merged commit 844df54 into vllm-project:main May 4, 2026
141 of 150 checks passed
chaojun-zhang pushed a commit to chaojun-zhang/vllm that referenced this pull request May 6, 2026
…alling + reasoning for more models (vllm-project#40894)

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>
Signed-off-by: Michael Goin <mgoin64@gmail.com>
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Co-authored-by: Michael Goin <mgoin64@gmail.com>
Co-authored-by: Ubospica <ubospica@gmail.com>
Co-authored-by: sfeng33 <4florafeng@gmail.com>
Copilot AI pushed a commit to hongbolv/vllm that referenced this pull request May 7, 2026
…alling + reasoning for more models (vllm-project#40894)

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>
Signed-off-by: Michael Goin <mgoin64@gmail.com>
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ikaadil pushed a commit to ikaadil/vllm that referenced this pull request May 7, 2026
…alling + reasoning for more models (vllm-project#40894)

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>
Signed-off-by: Michael Goin <mgoin64@gmail.com>
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class Qwen3CoderToolParser(ToolParser):
supports_required_and_named: bool = False
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As a widely used tool parser, Qwen3Coder should still support supports_required_and_named = True at this stage.

Otherwise, tool_choice="required" no longer works correctly now.

I think this should continue to be properly supported at least before structural_tag is enabled by default.
@sfeng33 @aarnphm @Seven-Streams @aarnphm @bbrowning

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see #42292

weifang231 pushed a commit to weifang231/eb-vllm that referenced this pull request May 13, 2026
…alling + reasoning for more models (vllm-project#40894)

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>
Signed-off-by: Michael Goin <mgoin64@gmail.com>
Signed-off-by: mgoin <mgoin64@gmail.com>
Signed-off-by: Ubospica <ubospica@gmail.com>
Signed-off-by: sfeng33 <4florafeng@gmail.com>
Co-authored-by: Michael Goin <mgoin64@gmail.com>
Co-authored-by: Ubospica <ubospica@gmail.com>
Co-authored-by: sfeng33 <4florafeng@gmail.com>
mfylcek pushed a commit to mfylcek/vllm that referenced this pull request May 19, 2026
…alling + reasoning for more models (vllm-project#40894)

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>
Signed-off-by: Michael Goin <mgoin64@gmail.com>
Signed-off-by: mgoin <mgoin64@gmail.com>
Signed-off-by: Ubospica <ubospica@gmail.com>
Signed-off-by: sfeng33 <4florafeng@gmail.com>
Co-authored-by: Michael Goin <mgoin64@gmail.com>
Co-authored-by: Ubospica <ubospica@gmail.com>
Co-authored-by: sfeng33 <4florafeng@gmail.com>
jhu960213 pushed a commit to jhu960213/vllm that referenced this pull request May 20, 2026
…alling + reasoning for more models (vllm-project#40894)

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>
Signed-off-by: Michael Goin <mgoin64@gmail.com>
Signed-off-by: mgoin <mgoin64@gmail.com>
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Signed-off-by: sfeng33 <4florafeng@gmail.com>
Co-authored-by: Michael Goin <mgoin64@gmail.com>
Co-authored-by: Ubospica <ubospica@gmail.com>
Co-authored-by: sfeng33 <4florafeng@gmail.com>
alexeldeib added a commit to alexeldeib/vllm that referenced this pull request May 31, 2026
The strict structural-tag path in `ToolParser.adjust_request` (added in vllm-project#40894,
gated by `VLLM_ENFORCE_STRICT_TOOL_CALLING`) installs `structural_tag` on a
pre-existing `StructuredOutputsParams` via in-place attribute assignment and
returns early without clearing `response_format`.

The in-place set bypasses `StructuredOutputsParams.__post_init__`, leaving any
prior mutually-exclusive constraint (`json`/`regex`/`choice`/`grammar`/
`json_object`, or one lowered from `response_format`) set alongside the new
`structural_tag`. When the params are re-validated downstream this violates the
one-constraint invariant, so a strict-mode request that also carries a
structured-output constraint or a `response_format` fails:

    ValueError: You can only use one kind of structured outputs constraint
    but multiple are specified

Rebuild `structured_outputs` with only the structural tag (preserving the
whitespace / additional-properties knobs) and null `response_format`, mirroring
what Step 2 of the same method already does for the JSON-schema path. Only the
strict auto/required/named path is affected; `VLLM_ENFORCE_STRICT_TOOL_CALLING`
is off by default. Every parser that installs a structural tag (DeepSeek-V4,
Qwen3-Coder, and Kimi via vllm-project#43155) flows through this one base path.

The interaction was raised in review on vllm-project#40894 and vllm-project#43155; the Kimi parser in
vllm-project#43155 already performs this rebuild for its required/named path.

Test plan (real requests, Kimi K2.6 NVFP4 TP=4, VLLM_ENFORCE_STRICT_TOOL_CALLING=1;
stock vs this patch applied in place; POST /v1/chat/completions, stream=false,
temperature=0; tool get_weather(city)):

  tool_choice  extra constraint     stock           with patch
  auto         response_format      HTTP 400        HTTP 200 tool_call   <- fixed
  auto         structured_outputs   HTTP 400        HTTP 200 tool_call   <- fixed
  auto         (none)               HTTP 200        HTTP 200 tool_call   (unchanged)
  required     response_format      HTTP 200        HTTP 200 tool_call   (unchanged;
       required/named already rebuilds -> the bug is specific to the auto path)

  Verbatim (auto + response_format):
    REQUEST  {"model":"moonshotai/Kimi-K2.6","tool_choice":"auto",
      "messages":[{"role":"user","content":"What is the weather in Paris? Call the tool."}],
      "tools":[{"type":"function","function":{"name":"get_weather","parameters":
        {"type":"object","properties":{"city":{"type":"string"}},"required":["city"]}}}],
      "response_format":{"type":"json_schema","json_schema":{"name":"answer","schema":
        {"type":"object","properties":{"answer":{"type":"string"}},"required":["answer"]}}}}
    STOCK    HTTP 400  {"error":{"message":"1 validation error for StructuredOutputsParams
      ... You can only use one kind of structured outputs constraint but multiple are
      specified: {'json': {...}, ..., 'structural_tag': '...'}"}}
    PATCH    HTTP 200  {"finish_reason":"tool_calls","message":{"tool_calls":[{"function":
      {"name":"get_weather","arguments":"{\"city\":\"Paris\"}"}}]}}

  Unit regression test: tests/tool_use/test_strict_tool_calling_adjust_request.py
  asserts adjust_request rebuilds to a single structural_tag constraint, nulls
  response_format, and preserves user whitespace knobs (fails on the pre-fix code).

Signed-off-by: Ace Eldeib <aeldeib@coreweave.com>
alexeldeib added a commit to alexeldeib/vllm that referenced this pull request May 31, 2026
ToolParser.adjust_request's strict structural-tag path (added in vllm-project#40894, gated by
VLLM_ENFORCE_STRICT_TOOL_CALLING) installs structural_tag on a pre-existing
StructuredOutputsParams via in-place attribute assignment and returns without
nulling response_format. The in-place set bypasses
StructuredOutputsParams.__post_init__, so the params keep a prior
mutually-exclusive constraint (json/regex/choice/grammar/json_object, or one
lowered from response_format) next to the new structural_tag. On the next
re-validation this trips the one-constraint invariant, so a strict-mode request
that also carries a structured-output constraint or a response_format fails with:

    ValueError: You can only use one kind of structured outputs constraint
    but multiple are specified

This affects any parser that installs a structural tag -- currently DeepSeek-V4
and Qwen3-Coder via get_structural_tag. The env var is off by default, and a
request with no pre-existing constraint is unaffected.

Fix: rebuild structured_outputs with only the structural tag (preserving the
whitespace / additional-properties knobs) and null response_format, mirroring
Step 2 of the same method. This "tool constraint wins, response_format dropped"
resolution already exists in Step 2, the DeepSeek-V3.2 override (vllm-project#41178), and for
required/auto in vllm-project#32006 / vllm-project#39969; the in-place-vs-rebuild trade-off was discussed
on vllm-project#40894 and vllm-project#43155 (whose Kimi path already rebuilds).

Repro / regression test (CPU, no model required):

    pytest tests/tool_use/test_strict_tool_calling_adjust_request.py

The added tests enable strict mode, give a parser a structural tag, and send
tools together with a response_format or a structured_outputs.json constraint
(tool_choice auto and required). On the pre-fix code adjust_request leaves two
constraints, and to_sampling_params raises the ValueError above; with this change
structured_outputs holds only the structural tag, response_format is None, and
the user's whitespace knobs are preserved. The conflict tests fail without this
patch and pass with it; the no-pre-existing-constraint case passes either way.

Equivalently over HTTP: with strict mode on, a tool_choice="auto" request that
also sets response_format returns HTTP 400 (the error above) before this change
and a normal tool call after; a required-tool request is unaffected because that
path already rebuilds.

Signed-off-by: Ace Eldeib <aeldeib@coreweave.com>
alexeldeib added a commit to alexeldeib/vllm that referenced this pull request May 31, 2026
ToolParser.adjust_request's strict structural-tag path (added in vllm-project#40894, gated by
VLLM_ENFORCE_STRICT_TOOL_CALLING) installs structural_tag on a pre-existing
StructuredOutputsParams via in-place attribute assignment and returns without
nulling response_format. The in-place set bypasses
StructuredOutputsParams.__post_init__, so the params keep a prior
mutually-exclusive constraint (json/regex/choice/grammar/json_object, or one
lowered from response_format) next to the new structural_tag. On the next
re-validation this trips the one-constraint invariant, so a strict-mode request
that also carries a structured-output constraint or a response_format fails with:

    ValueError: You can only use one kind of structured outputs constraint
    but multiple are specified

This affects any parser that installs a structural tag -- currently DeepSeek-V4
and Qwen3-Coder via get_structural_tag. The env var is off by default, and a
request with no pre-existing constraint is unaffected.

Fix: rebuild structured_outputs with only the structural tag (preserving the
whitespace / additional-properties knobs) and null response_format, mirroring
Step 2 of the same method. This "tool constraint wins, response_format dropped"
resolution already exists in Step 2 and the DeepSeek-V3.2 override (vllm-project#41178), and
is the intent of the open auto-path fix vllm-project#39969; the in-place-vs-rebuild trade-off
was discussed on vllm-project#40894 and vllm-project#43155 (whose Kimi path already rebuilds).

Repro / regression test (CPU, no model required):

    pytest tests/tool_use/test_strict_tool_calling_adjust_request.py

The added tests enable strict mode, give a parser a structural tag, and send
tools together with a response_format or a structured_outputs.json constraint
(tool_choice auto and required). On the pre-fix code adjust_request leaves two
constraints, and to_sampling_params raises the ValueError above; with this change
structured_outputs holds only the structural tag, response_format is None, and
the user's whitespace knobs are preserved. The conflict tests fail without this
patch and pass with it; the no-pre-existing-constraint case passes either way.

Equivalently over HTTP: with strict mode on, a tool_choice="auto" request that
also sets response_format returns HTTP 400 (the error above) before this change
and a normal tool call after; a required-tool request is unaffected because that
path already rebuilds.

Signed-off-by: Ace Eldeib <aeldeib@coreweave.com>
mvanhorn pushed a commit to mvanhorn/vllm that referenced this pull request Jun 4, 2026
…alling + reasoning for more models (vllm-project#40894)

Signed-off-by: Yuchuan <yuchuan.7streams@gmail.com>
Signed-off-by: Michael Goin <mgoin64@gmail.com>
Signed-off-by: mgoin <mgoin64@gmail.com>
Signed-off-by: Ubospica <ubospica@gmail.com>
Signed-off-by: sfeng33 <4florafeng@gmail.com>
Co-authored-by: Michael Goin <mgoin64@gmail.com>
Co-authored-by: Ubospica <ubospica@gmail.com>
Co-authored-by: sfeng33 <4florafeng@gmail.com>
Signed-off-by: Matt Van Horn <455140+mvanhorn@users.noreply.github.com>
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ci/build deepseek Related to DeepSeek models frontend qwen Related to Qwen models ready ONLY add when PR is ready to merge/full CI is needed tool-calling

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Status: Done

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