diff --git a/internal/config/allowlist/allowed_ext_test.go b/internal/config/allowlist/allowed_ext_test.go
index fc712a77a..d4aaa9716 100644
--- a/internal/config/allowlist/allowed_ext_test.go
+++ b/internal/config/allowlist/allowed_ext_test.go
@@ -96,6 +96,9 @@ func TestIsAllowedExt(t *testing.T) {
 		{".THRIFT", true},
 		{".capnp", true},
 		{".CAPNP", true},
+		{".mojo", true},
+		{".MOJO", true},
+		{".🔥", true},
 		{".ml", true},
 		{".ML", true},
 		{".mli", true},
@@ -315,6 +318,10 @@ func TestIsExcludedPath(t *testing.T) {
 		{"vyper non-test", "src/token.vy", false},
 		{"vyper test in filename only", "src/test_helpers.vy", false},
 
+		// Mojo has no conventional default test-file exclusion.
+		{"mojo module", "src/matmul.mojo", false},
+		{"mojo fire extension", "src/matmul.🔥", false},
+
 		// Snapshot files
 		{"jest snapshot dir", "src/__snapshots__/App.test.js.snap", true},
 		{"snap file", "src/components/Button.snap", true},
diff --git a/internal/config/allowlist/supported_file_types.json b/internal/config/allowlist/supported_file_types.json
index b3951c142..5827ea118 100644
--- a/internal/config/allowlist/supported_file_types.json
+++ b/internal/config/allowlist/supported_file_types.json
@@ -98,6 +98,8 @@
   ".zig",
   ".thrift",
   ".capnp",
+  ".mojo",
+  ".🔥",
   ".ml",
   ".mli",
   ".re",
diff --git a/internal/config/rules/rule_docs/mojo.md b/internal/config/rules/rule_docs/mojo.md
new file mode 100644
index 000000000..62c6438d7
--- /dev/null
+++ b/internal/config/rules/rule_docs/mojo.md
@@ -0,0 +1,41 @@
+> Favor precision over recall: only raise an issue when you are confident it is a real defect. Mojo is a young, fast-evolving language layered on Python/MLIR semantics — do not report a construct as wrong solely because it looks unfamiliar, and account for the project's declared Mojo version before flagging syntax or stdlib API changes.
+
+#### Obvious Typos or Spelling Errors
+- Spelling errors in `struct`, `fn`, `trait`, and `alias` names at their declaration sites; do not report spelling errors at call sites
+- Typos in docstrings, error messages, or `assert_*` failure messages that affect readability
+
+#### Ownership, Borrowing, and Lifetimes
+- `borrowed`/`inout`/`owned` argument conventions that do not match how the parameter is actually used (e.g. `borrowed` on a parameter that is mutated, or `owned` taken when a borrow would suffice and now forces an unnecessary copy)
+- Values moved with `^` (the transfer sigil) while a reference to the original binding is still read afterward, or a transfer used where an implicit copy was actually intended
+- `__copyinit__`/`__moveinit__`/`__del__` implementations that do not correctly duplicate or release owned resources (buffers, file handles, pointers), risking a double-free, use-after-free, or resource leak
+- Structs holding a raw pointer or `UnsafePointer` field without a corresponding destructor, so instances leak the pointee when they go out of scope
+
+#### Value Semantics and Struct Design
+- `struct`s intended to have reference semantics but missing `@register_passable` or `@value` decisions appropriate to the type, causing unexpected copies of large payloads on every pass
+- Overloaded operators or `fn __eq__`/`__hash__` pairs that are inconsistent with each other, breaking use as dictionary keys or set members
+- Implicit conversions between numeric SIMD/scalar types that silently narrow precision (e.g. `Float64` to `Float32`) in a hot numeric path without an explicit cast signaling intent
+
+#### Unsafe and Low-Level Interop
+- `UnsafePointer`, `DTypePointer`, or raw memory APIs (`alloc`, `free`, `bitcast`, `load`/`store`) used without a matching deallocation, correct alignment, or a verified bounds check on the access
+- `external_call`/FFI bindings to C/Python whose declared signature (types, calling convention, ownership of returned memory) does not match the actual foreign function
+- Pointer arithmetic or manual indexing into a `Tensor`/`Buffer`'s underlying storage that bypasses shape/stride validation, risking out-of-bounds reads/writes
+- Untrusted input (sizes, indices, buffer lengths) flowing into an unsafe pointer operation without validation at the boundary where it enters Mojo code
+
+#### Python Interop Boundary
+- Values crossing the `PythonObject`/native-Mojo boundary without validating type and structure, since Python's dynamic typing gives no compile-time guarantee on the Mojo side
+- Python exceptions raised across the interop boundary that are not caught and translated into a Mojo-side error path, leaving the caller with an unhandled failure
+- Performance-critical loops that call back into Python object methods per-iteration instead of converting to native Mojo types once, negating Mojo's performance advantage over pure Python
+
+#### Concurrency and Parallelism
+- `parallelize`/`vectorize` closures that capture and mutate shared external state without synchronization, creating data races across parallel lanes or threads
+- SIMD-width assumptions (fixed vector widths) hardcoded in a kernel that do not adapt to the target hardware's actual SIMD width, silently processing fewer or more elements than intended
+- Parallel loop bodies with a loop-carried dependency (an accumulator or index computed from a previous iteration) that is incorrect to parallelize as written
+
+#### Performance Anti-Patterns
+- Unnecessary `owned`/copy semantics in hot numeric kernels where the equivalent NumPy/Python code would have used a view, defeating the point of dropping into Mojo for speed
+- Missing `@parameter`/compile-time specialization on shapes, dtypes, or loop bounds that are known at compile time and would allow the compiler to unroll or vectorize more aggressively
+- Bounds checks or dynamic dispatch left in an inner loop that could be hoisted out via compile-time `alias`/`@parameter if` specialization
+
+#### Security-Sensitive Areas
+- Secrets, credentials, or API keys embedded directly in Mojo source rather than loaded from environment/config at runtime
+- Untrusted data deserialized or interpreted via raw pointer casts (`bitcast`) without validating the source buffer's length and layout first
diff --git a/internal/config/rules/system_rules.json b/internal/config/rules/system_rules.json
index d98de0913..0ce54bb02 100644
--- a/internal/config/rules/system_rules.json
+++ b/internal/config/rules/system_rules.json
@@ -44,6 +44,7 @@
     "**/*.zig": "zig.md",
     "**/*.thrift": "thrift.md",
     "**/*.capnp": "capnp.md",
+    "**/*.{mojo,🔥}": "mojo.md",
     "**/*.{ml,mli}": "ocaml.md",
     "**/*.{re,rei}": "ocaml.md",
     "**/*.{v,sv,vh}": "verilog.md",
diff --git a/internal/config/rules/system_rules_test.go b/internal/config/rules/system_rules_test.go
index 52faa8e8b..b8bcc9c52 100644
--- a/internal/config/rules/system_rules_test.go
+++ b/internal/config/rules/system_rules_test.go
@@ -147,6 +147,8 @@ func TestResolve_DefaultRules(t *testing.T) {
 		{"if/common.thrift", "Field IDs and Wire Compatibility"},
 		{"schema/addressbook.capnp", "Ordinals and Wire Compatibility"},
 		{"src/rpc.capnp", "Ordinals and Wire Compatibility"},
+		{"src/matmul.mojo", "Ownership, Borrowing, and Lifetimes"},
+		{"src/matmul.🔥", "Ownership, Borrowing, and Lifetimes"},
 		{"src/parser.ml", "Pattern Matching"},
 		{"lib/parser.mli", "Pattern Matching"},
 		{"src/Component.re", "Pattern Matching"},
diff --git a/pages/src/content/docs/en/review-rules.md b/pages/src/content/docs/en/review-rules.md
index e5c2dfe31..be5156e07 100644
--- a/pages/src/content/docs/en/review-rules.md
+++ b/pages/src/content/docs/en/review-rules.md
@@ -183,6 +183,7 @@ matching order:
 | `**/*.{jsonnet,libsonnet}` | `jsonnet.md` — Jsonnet configuration templates and libraries. |
 | `**/*.thrift` | `thrift.md` — Apache Thrift IDL wire compatibility. |
 | `**/*.capnp` | `capnp.md` — Cap'n Proto schema wire compatibility. |
+| `**/*.{mojo,🔥}` | `mojo.md` — Mojo source. |
 | `**/*.{v,sv,vh}` | `verilog.md` — Verilog and SystemVerilog RTL. |
 | `**/*.{vhd,vhdl}` | `vhdl.md` — VHDL RTL. |
 | `**/*.m` | `matlab.md` (or `objc.md` via [content sniffing](#content-sniffing-for-m-files)) |
diff --git a/pages/src/content/docs/ja/review-rules.md b/pages/src/content/docs/ja/review-rules.md
index 804159acc..4394f35da 100644
--- a/pages/src/content/docs/ja/review-rules.md
+++ b/pages/src/content/docs/ja/review-rules.md
@@ -145,6 +145,7 @@ OCR は [`bmatcuk/doublestar/v4`](https://pkg.go.dev/github.com/bmatcuk/doublest
 | `**/*.{jsonnet,libsonnet}` | `jsonnet.md`: Jsonnet の設定テンプレートとライブラリ。 |
 | `**/*.thrift` | `thrift.md`: Apache Thrift IDL のワイヤ互換性。 |
 | `**/*.capnp` | `capnp.md`: Cap'n Proto スキーマのワイヤ互換性。 |
+| `**/*.{mojo,🔥}` | `mojo.md` - Mojo ソースコード。 |
 | `**/*.{v,sv,vh}` | `verilog.md`: Verilog および SystemVerilog の RTL。 |
 | `**/*.{vhd,vhdl}` | `vhdl.md`: VHDL の RTL。 |
 | `**/*.m` | `matlab.md`（または[コンテンツスニッフィング](#content-sniffing-for-m-files)により `objc.md`） |
diff --git a/pages/src/content/docs/ru/review-rules.md b/pages/src/content/docs/ru/review-rules.md
index dd0cea104..2caf195e5 100644
--- a/pages/src/content/docs/ru/review-rules.md
+++ b/pages/src/content/docs/ru/review-rules.md
@@ -185,6 +185,7 @@ OCR использует [`bmatcuk/doublestar/v4`](https://pkg.go.dev/github.com
 | `**/*.{jsonnet,libsonnet}` | `jsonnet.md` — шаблоны конфигурации и библиотеки Jsonnet. |
 | `**/*.thrift` | `thrift.md` — совместимость Apache Thrift IDL на уровне wire. |
 | `**/*.capnp` | `capnp.md` — совместимость схем Cap'n Proto на уровне wire. |
+| `**/*.{mojo,🔥}` | `mojo.md` - исходный код Mojo. |
 | `**/*.{v,sv,vh}` | `verilog.md` — RTL на Verilog и SystemVerilog. |
 | `**/*.{vhd,vhdl}` | `vhdl.md` — RTL на VHDL. |
 | `**/*.m` | `matlab.md` (или `objc.md` через [определение содержимого](#content-sniffing-for-m-files)) |
diff --git a/pages/src/content/docs/zh/review-rules.md b/pages/src/content/docs/zh/review-rules.md
index 8059262e3..4e54a847d 100644
--- a/pages/src/content/docs/zh/review-rules.md
+++ b/pages/src/content/docs/zh/review-rules.md
@@ -166,6 +166,7 @@ OCR 用 [`bmatcuk/doublestar/v4`](https://pkg.go.dev/github.com/bmatcuk/doublest
 | `**/*.{jsonnet,libsonnet}` | `jsonnet.md`——Jsonnet 配置模板与库。 |
 | `**/*.thrift` | `thrift.md`——Apache Thrift IDL 线协议兼容性。 |
 | `**/*.capnp` | `capnp.md`——Cap'n Proto schema 线协议兼容性。 |
+| `**/*.{mojo,🔥}` | `mojo.md` - Mojo 源代码。 |
 | `**/*.{v,sv,vh}` | `verilog.md`——Verilog 与 SystemVerilog RTL。 |
 | `**/*.{vhd,vhdl}` | `vhdl.md`——VHDL RTL。 |
 | `**/*.m` | `matlab.md`（或通过[内容嗅探](#针对-m-文件的内容嗅探)使用 `objc.md`） |