refactor(symphony): the argument shapes a schema pins move out of the Kimi K3 module by slin1237 · Pull Request #2881 · smg-project/smg

slin1237 · 2026-10-08T08:50:42Z

What

Stacked on #2880 (base feat/symphony-grammar-k3), a move with one parameter, inside crates/symphony/ only.

grammar/schema.rs: what a tool's JSON schema says about each argument, for the syntaxes that write arguments one by one with a type of their own. shape(schema, definitions, text) gives the type a property's schema pins, by the name the templates write, and the grammar of a value of that type; Definitions carries the root's $defs and definitions along with a property's schema so a local $ref resolves when the engine compiles it on its own. Both come out of the Kimi K3 module unchanged, except that shape now takes from its caller the grammar of a string written as it is: Kimi K3 passes its own (any text up to one of its markers), and the keyed syntaxes, next, will pass theirs.
grammar/xtml.rs keeps what is Kimi K3's: the ways in, the call and argument tags, the attribute escaping, the shapes of an argument without a type.
A pointer to the root resolves to nothing (from CodeRabbit's finding on feat(symphony): Kimi K3's structural tag, derived from the table's regions and the old builder's argument shapes #2880, fixed here where the code now lives): each property's schema goes to the engine as a document of its own, so a $ref of # in it would name the property itself, and the engine would be given a schema that only refers to itself. Definitions no longer keeps the root; such a property takes any type and any value, like one whose pointer names nothing. The old Kimi K3 builder resolved # to the root and sent the self-reference on. The check follows every pointer it resolves into the definition it names, as far as the pointers reach (a definition that names itself is followed once, and at most sixty-four pointers are followed in all, so a request's chain of definitions cannot send the walk arbitrarily deep; past that the property pins nothing), since the definitions travel with the property: a # or a pointer at nothing inside one of them counts as the property's own. Pointers resolve against the property's own $defs/definitions before the root's, the document attached_to sends.

No other grammar changes: the Kimi K3 tests pin the same payloads as before, through the moved code, plus a whole: {"$ref": "#"} property with the typeless shape and a tool whose definitions hold a pointer at nothing, one to the root and a recursive one. Nullable type arrays (["string", "null"]) still pin nothing, in every syntax, as before this PR: a unit of its own after #2884.

Gates

By exit code (.claude/symphony/gates.sh, base feat/symphony-grammar-k3): fmt, clippy -D warnings, test (328 lib, 10 fixture, 7 contract, 5 README), doc, width, codespell, all 0.

Not in this PR

The keyed syntaxes' own argument tags (Ling's newlines, Hy4's suffixed tags), the next step, which is what the move is for.

Merge

After #2880, rebased onto main. Squash under rule 25 (rule 18: nothing of Format's changes; the maintainer merges). Subject: the PR title plus (#<n>). Body, with the moved code's authors as on #2880:

Signed-off-by: Simo Lin <25425177+slin1237@users.noreply.github.com>
Co-authored-by: Chang Su <8605658+CatherineSue@users.noreply.github.com>
Co-authored-by: Keyang Ru <rukeyang@gmail.com>
Co-authored-by: key4ng <key4ng@users.noreply.github.com>
Co-authored-by: Chen Hongtao <56470055+chenht2022@users.noreply.github.com>
Co-authored-by: LightSeek Foundation <243258330+lightseek-bot@users.noreply.github.com>

coderabbitai · 2026-10-08T08:50:51Z

📝 Summary

Summary by CodeRabbit

New Features
- Tool arguments now follow supported schema types, including string enumerations, to guide which values can be supplied. Resolvable local references and shared definitions are applied to argument schemas.
Bug Fixes
- Unresolved references and schemas without a supported type no longer impose incomplete value constraints.
- Schema keywords alongside a reference are combined, with property-defined entries taking precedence over root definitions.

Walkthrough

The XTML grammar now uses a private schema module to map property schemas to argument grammars. The argument path supplies any_value when a schema cannot be pinned. Tests cover root references, dangling references, and recursive references inside definitions.

Changes

Schema-Driven XTML Call Grammar

Layer / File(s)	Summary
Schema resolution and argument shapes `crates/symphony/src/grammar/schema.rs`	The schema module maps supported types and string enums to grammars. It resolves local references under `$defs` and `definitions`, checks reference keywords, and attaches root definitions to property schemas.
XTML argument shaping `crates/symphony/src/grammar.rs`, `crates/symphony/src/grammar/xtml.rs`	XTML now calls the shared schema helpers and supplies `any_value` when a schema cannot be pinned. Tests cover root references, dangling references, and references inside definitions.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Refactor

Merge Risk: 🔵 Low · up to ad493

Some valid schemas may produce unrestricted argument grammars. Address these cases or explicitly accept the bounded risk before merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 88.89% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 18 functions across 4 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title accurately identifies the refactor that moves schema-based argument shapes out of the Kimi K3 module. Although the wording is somewhat awkward, it is specific and related to the main change.
Description check	✅ Passed	The description clearly explains the schema module, shared shape and reference-resolution logic, Kimi K3 changes, tests, scope, and excluded work. It is directly related to the changeset.

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claude · 2026-10-08T08:51:34Z

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hello-alexmcc

Rule-17 review of #2881 at b041332: approve. A faithful move with one new parameter. No payload changes, and my checks pass.

The move: grammar/schema.rs is exactly the 152 lines removed from xtml.rs, plus its module doc and pub(super) on shape, Definitions and Definitions::of. The one semantic line is "string" => Some(("string", text())). xtml.rs passes its own any_value, so Kimi K3's argument shapes are unchanged.

No payload moves. I checked at 9836607 merged on main 21d5e44:

Kimi K3 vs KimiK3Parser::build_structural_tag, over 14 tool sets and both flags: the same 56 payloads as at #2880, equal except for "type": "tag".
Every table's grammar (180): identical to #2880's.
The ways-in probe (two_doors, MiniMax M3 declared as XTML, into_the_block, Kimi K3): identical to #2880's.
GLM and DSML vs the old builders: 36 of 36 equal.

Gates. I ran them at 9836607 merged on main 21d5e44, with Rust 1.98.0, its own target dir and -j 2; each exited 0:

cargo +nightly fmt -p smg-symphony --check
cargo clippy -p smg-symphony --all-targets --all-features -- -D warnings
cargo test -p smg-symphony: 328 lib, 10 fixture, 7 contract and 5 README tests
RUSTDOCFLAGS="-D warnings" cargo doc -p smg-symphony --no-deps

b041332 changes three lines from there, which I read. shape is now imported by name (the bot's thread), and text is now impl FnOnce() -> Grammar, which shape calls at most once. Neither changes a payload.

Rule 17:

Fixture ids: none changed.
Property tests: no new format.
Protected paths: the crate's grammar module, which this stream owns. Nothing public changes, so rule 18 isn't touched.
Trailers: the squash body carries the same six as #2880, since the moved code is the ported code. No AI trailer.
Threads: one, answered and resolved.

The merge is the maintainer's (rule 25), after #2880.

… Kimi K3 module Kimi K3's tag reads each property's schema for the type it pins and the grammar of a value of that type, with the tool's definitions carried along so a `$ref` still resolves; the keyed syntaxes, which also write arguments one by one, will read the same. So `shape` and `Definitions` move to `grammar/schema.rs`, and `shape` takes the grammar of a string written as it is from its caller, the one thing that differs between the syntaxes. The Kimi K3 module keeps its own tags, escaping and shapes without a type. Nothing an engine sees changes. Signed-off-by: Simo Lin <25425177+slin1237@users.noreply.github.com> Co-authored-by: Chang Su <8605658+CatherineSue@users.noreply.github.com> Co-authored-by: Keyang Ru <rukeyang@gmail.com> Co-authored-by: key4ng <key4ng@users.noreply.github.com> Co-authored-by: Chen Hongtao <56470055+chenht2022@users.noreply.github.com> Co-authored-by: LightSeek Foundation <243258330+lightseek-bot@users.noreply.github.com>

…ar once `schema::shape(schema, …)` used one word for the module and the value; the function is imported by name now, and `text` is an `FnOnce`, which is all a single call needs. Signed-off-by: Simo Lin <25425177+slin1237@users.noreply.github.com> Co-authored-by: Chang Su <8605658+CatherineSue@users.noreply.github.com>

…n document Each property's schema goes to the engine as a document of its own, so a `$ref` of `#` in it names the property, not the tool's schema it stood in, and the engine would be given a schema that only refers to itself. The definitions no longer keep the root, `#` resolves to nothing, and such a property takes any type and any value, like one whose pointer names nothing. The old Kimi K3 builder resolved `#` to the root and sent the self-reference on. Signed-off-by: Simo Lin <25425177+slin1237@users.noreply.github.com> Co-authored-by: Chang Su <8605658+CatherineSue@users.noreply.github.com> Co-authored-by: Keyang Ru <rukeyang@gmail.com> Co-authored-by: key4ng <key4ng@users.noreply.github.com> Co-authored-by: Chen Hongtao <56470055+chenht2022@users.noreply.github.com> Co-authored-by: LightSeek Foundation <243258330+lightseek-bot@users.noreply.github.com>

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Inline comments:
Review comments at @crates/symphony/src/grammar/schema.rs:
- Line 46: Update shape so it handles type arrays with exactly one supported
non-null type, preserving that type in the argument attribute and allowing both
that type and null in the value grammar. Keep the fallback for arrays containing
multiple non-null types unless the grammar can represent them without losing
constraints.

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crates/symphony/src/format.rs
crates/symphony/src/grammar.rs
crates/symphony/src/grammar/schema.rs
crates/symphony/src/grammar/xtml.rs

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…s as the property's own The definitions travel with a property's schema to the engine, so a pointer at nothing, or to the root, inside a definition the property names reaches the engine as surely as one in the property itself, and the check that keeps such a property untyped now follows every pointer it resolves into what it names, as far as the pointers reach. A definition that names itself is followed once, so a recursive tree keeps its schema. Signed-off-by: Simo Lin <25425177+slin1237@users.noreply.github.com> Co-authored-by: Chang Su <8605658+CatherineSue@users.noreply.github.com> Co-authored-by: Keyang Ru <rukeyang@gmail.com> Co-authored-by: key4ng <key4ng@users.noreply.github.com> Co-authored-by: Chen Hongtao <56470055+chenht2022@users.noreply.github.com> Co-authored-by: LightSeek Foundation <243258330+lightseek-bot@users.noreply.github.com>

slin1237 · 2026-10-08T12:47:39Z

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Actionable comments posted: 1

🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.

Inline comments:
Review comments at @crates/symphony/src/grammar/schema.rs:
- Line 112: Update the nested-reference validation in the resolve call used by
named_resolves to use the merged definitions that attached_to sends to the
engine, so a property's valid override is preserved when validating its outer
definition.

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coderabbitai · 2026-10-08T12:51:26Z

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hello-alexmcc

Rule-17 re-review of #2881 at ad49353 (rebased on main f9be4ee): comment. I'll approve once the two open threads are answered; the first needs a code change.

Following pointers without a bound (the bot's Important thread, schema.rs:117): agreed, and it matters more than a nit. Tool schemas arrive in requests. A chain of distinct definitions adds stack frames per link, followed only stops cycles, and a stack overflow aborts the whole process rather than the request. A walk with an explicit stack, or a cap on the pointers followed with anything past it treated as unresolved (so the property takes any value, as a dangling pointer does), keeps one request from taking the gateway down. A test with a long chain would pin it.
Resolving against the merged definitions (CodeRabbit, schema.rs:112): agreed. The check should resolve nested pointers against the same definitions attached_to sends to the engine, so a property's own definition shadows the root's in both places.

What holds at this head:

Gates: fmt, clippy and doc exit 0; tests 330 lib, 10 fixture, 7 contract and 5 README.
Every table's grammar is identical to main's (#2880 merged): 180 grammars, 0 lines differ.
GLM and DSML vs the old builders: 36 of 36 equal.
Kimi K3 vs the old builder:
- All 14 tool sets differ only by "type": "tag", except the one with {"$ref": "#"}.
- That property now takes any value, from d173b5e. Right, since a property compiled as its own document can't name the tool's root.
Trailers: six in the squash body, and no AI trailer.

slin1237 requested a review from CatherineSue as a code owner October 8, 2026 08:50

github-actions Bot added the symphony crates/symphony: the unified output parser label Oct 8, 2026

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slin1237 force-pushed the feat/symphony-grammar-k3 branch from 1a8c5b1 to 307cbdf Compare October 8, 2026 12:25

slin1237 force-pushed the refactor/symphony-grammar-schema branch from b041332 to 39e22c5 Compare October 8, 2026 12:26

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Base automatically changed from feat/symphony-grammar-k3 to main October 8, 2026 12:33

slin1237 and others added 3 commits October 8, 2026 05:34

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slin1237 force-pushed the refactor/symphony-grammar-schema branch from 39e22c5 to d173b5e Compare October 8, 2026 12:38

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slin1237 merged commit f066d39 into main Oct 8, 2026
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fix(symphony): the pointer walk is bounded, and reads the property's own definitions first #2886

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refactor(symphony): the argument shapes a schema pins move out of the Kimi K3 module - #2881

refactor(symphony): the argument shapes a schema pins move out of the Kimi K3 module#2881
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