diff --git a/.claude/skills/biome-developer/SKILL.md b/.claude/skills/biome-developer/SKILL.md
index dc9c47c878a2..479eb8d739b6 100644
--- a/.claude/skills/biome-developer/SKILL.md
+++ b/.claude/skills/biome-developer/SKILL.md
@@ -138,6 +138,34 @@ if let Some(directive) = VueDirective::cast_ref(&element)
 }
 ```
 
+### Cargo Dependencies: `workspace = true` vs `path = "..."`
+
+Internal `biome_*` crates listed under `[dev-dependencies]` **MUST** use `path = "../<crate_name>"`, not `workspace = true`. Using `workspace = true` for dev-dependencies can cause Cargo to resolve the crate from the registry instead of the local workspace, which is incorrect.
+
+Regular `[dependencies]` still use `workspace = true` as normal — this rule only applies to `[dev-dependencies]`.
+
+**DO:**
+- Use `path = "../biome_foo"` for all `biome_*` dev-dependencies
+- Preserve any extra attributes like `features` when converting
+
+**DON'T:**
+- Do NOT use `workspace = true` for `biome_*` crates in `[dev-dependencies]`
+
+**Example:**
+```toml
+# WRONG: may resolve from registry
+[dev-dependencies]
+biome_js_parser = { workspace = true }
+biome_formatter = { workspace = true, features = ["countme"] }
+
+# CORRECT: always resolves locally
+[dev-dependencies]
+biome_js_parser = { path = "../biome_js_parser" }
+biome_formatter = { path = "../biome_formatter", features = ["countme"] }
+```
+
+All crates live as siblings under `crates/`, so the relative path is always `../biome_<name>`.
+
 ### Legacy and Deprecated Syntax
 
 **DO:**
diff --git a/AGENTS.md b/AGENTS.md
index 59606926abff..1e52363253d2 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -363,6 +363,7 @@ Before opening a PR, verify:
 - Claim patterns are "widely used" or "common" without evidence
 - Implement legacy/deprecated syntax without checking with the user first
 - Make assumptions about API design - inspect actual code structure first
+- Use `workspace = true` for `biome_*` crates in `[dev-dependencies]` — use `path = "../biome_*"` instead
 
 ✅ **Do:**
 - Ask the user if unsure about changesets
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a57db24f7f37..b196a365b9c0 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -341,7 +341,21 @@ To know the technical details of how our formatter works and how to write test,
 
 [Workspace dependencies](https://doc.rust-lang.org/cargo/reference/workspaces.html#the-dependencies-table) are used, and many dependencies are defined in Cargo.toml in the root.
 
-Internal crates are loaded with `workspace = true` for each crate. About `dev-dependencies`, we use [path dependencies](https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#specifying-path-dependencies) to avoid requiring the published version of these crates.
+Internal crates (`biome_*`) are loaded with `workspace = true` under `[dependencies]`.
+
+However, for `[dev-dependencies]`, internal `biome_*` crates **must** use [path dependencies](https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#specifying-path-dependencies) instead of `workspace = true`. This avoids resolving these crates from the registry when they are only needed for testing.
+
+```toml
+[dependencies]
+biome_parser = { workspace = true }  # OK: workspace = true for regular deps
+
+[dev-dependencies]
+biome_test_utils = { path = "../biome_test_utils" }              # CORRECT
+biome_formatter  = { path = "../biome_formatter", features = ["countme"] } # CORRECT with features
+# biome_test_utils = { workspace = true }                        # WRONG: do not use workspace for dev-deps
+```
+
+All internal crates live as siblings under `crates/`, so the relative path is always `../biome_<name>`.
 
 ## Node.js development
 
diff --git a/crates/biome_cli/Cargo.toml b/crates/biome_cli/Cargo.toml
index fa90e6ebcc08..a1cb59f88ae6 100644
--- a/crates/biome_cli/Cargo.toml
+++ b/crates/biome_cli/Cargo.toml
@@ -82,10 +82,10 @@ tracing-subscriber       = { workspace = true, features = ["env-filter", "json"]
 tracing-tree             = "0.4.1"
 
 [dev-dependencies]
-biome_css_formatter  = { workspace = true }
-biome_js_formatter   = { workspace = true }
-biome_json_formatter = { workspace = true }
-biome_json_parser    = { workspace = true }
+biome_css_formatter  = { path = "../biome_css_formatter" }
+biome_js_formatter   = { path = "../biome_js_formatter" }
+biome_json_formatter = { path = "../biome_json_formatter" }
+biome_json_parser    = { path = "../biome_json_parser" }
 directories          = { workspace = true }
 insta                = { workspace = true }
 regex                = { workspace = true }
diff --git a/crates/biome_css_analyze/Cargo.toml b/crates/biome_css_analyze/Cargo.toml
index c2d43d6f4124..3a2344f8d29f 100644
--- a/crates/biome_css_analyze/Cargo.toml
+++ b/crates/biome_css_analyze/Cargo.toml
@@ -40,8 +40,8 @@ serde                    = { workspace = true, features = ["derive"] }
 
 [dev-dependencies]
 biome_css_parser    = { path = "../biome_css_parser" }
-biome_fs            = { workspace = true }
-biome_plugin_loader = { workspace = true }
+biome_fs            = { path = "../biome_fs" }
+biome_plugin_loader = { path = "../biome_plugin_loader" }
 biome_test_utils    = { path = "../biome_test_utils" }
 camino              = { workspace = true }
 criterion           = { package = "codspeed-criterion-compat", version = "*" }
diff --git a/crates/biome_css_formatter/Cargo.toml b/crates/biome_css_formatter/Cargo.toml
index 42c4993d8bb7..0bec6f05ae00 100644
--- a/crates/biome_css_formatter/Cargo.toml
+++ b/crates/biome_css_formatter/Cargo.toml
@@ -33,7 +33,7 @@ biome_suppression = { workspace = true }
 biome_configuration  = { path = "../biome_configuration" }
 biome_css_parser     = { path = "../biome_css_parser" }
 biome_css_syntax     = { path = "../biome_css_syntax", features = ["scss"] }
-biome_formatter      = { workspace = true, features = ["countme"] }
+biome_formatter      = { path = "../biome_formatter", features = ["countme"] }
 biome_formatter_test = { path = "../biome_formatter_test" }
 biome_fs             = { path = "../biome_fs" }
 biome_parser         = { path = "../biome_parser" }
diff --git a/crates/biome_deserialize/Cargo.toml b/crates/biome_deserialize/Cargo.toml
index 5923b80cbaeb..b138cf527784 100644
--- a/crates/biome_deserialize/Cargo.toml
+++ b/crates/biome_deserialize/Cargo.toml
@@ -28,7 +28,7 @@ serde_json        = { workspace = true, optional = true }
 smallvec          = { workspace = true, optional = true }
 
 [dev-dependencies]
-biome_deserialize_macros = { workspace = true }
+biome_deserialize_macros = { path = "../biome_deserialize_macros" }
 
 [features]
 camino   = ["dep:camino"]
diff --git a/crates/biome_graphql_parser/Cargo.toml b/crates/biome_graphql_parser/Cargo.toml
index 044974f24368..f6442af86979 100644
--- a/crates/biome_graphql_parser/Cargo.toml
+++ b/crates/biome_graphql_parser/Cargo.toml
@@ -29,7 +29,7 @@ tracing               = { workspace = true }
 unicode-bom           = { workspace = true }
 
 [dev-dependencies]
-biome_test_utils  = { workspace = true }
+biome_test_utils  = { path = "../biome_test_utils" }
 criterion         = { package = "codspeed-criterion-compat", version = "*" }
 insta             = { workspace = true }
 quickcheck        = { workspace = true }
diff --git a/crates/biome_grit_parser/Cargo.toml b/crates/biome_grit_parser/Cargo.toml
index 4cc6d7e9767b..9d1e0ac14121 100644
--- a/crates/biome_grit_parser/Cargo.toml
+++ b/crates/biome_grit_parser/Cargo.toml
@@ -30,7 +30,7 @@ tracing            = { workspace = true }
 unicode-bom        = { workspace = true }
 
 [dev-dependencies]
-biome_test_utils  = { workspace = true }
+biome_test_utils  = { path = "../biome_test_utils" }
 insta             = { workspace = true }
 quickcheck        = { workspace = true }
 quickcheck_macros = { workspace = true }
diff --git a/crates/biome_html_formatter/Cargo.toml b/crates/biome_html_formatter/Cargo.toml
index 86f9deddc0b6..8f1ffe0b72d6 100644
--- a/crates/biome_html_formatter/Cargo.toml
+++ b/crates/biome_html_formatter/Cargo.toml
@@ -28,13 +28,13 @@ schemars                     = { workspace = true, optional = true }
 serde                        = { workspace = true, optional = true }
 
 [dev-dependencies]
-biome_configuration  = { workspace = true }
-biome_formatter      = { workspace = true, features = ["countme"] }
-biome_formatter_test = { workspace = true }
-biome_fs             = { workspace = true }
-biome_html_parser    = { workspace = true }
-biome_parser         = { workspace = true }
-biome_service        = { workspace = true }
+biome_configuration  = { path = "../biome_configuration" }
+biome_formatter      = { path = "../biome_formatter", features = ["countme"] }
+biome_formatter_test = { path = "../biome_formatter_test" }
+biome_fs             = { path = "../biome_fs" }
+biome_html_parser    = { path = "../biome_html_parser" }
+biome_parser         = { path = "../biome_parser" }
+biome_service        = { path = "../biome_service" }
 biome_test_utils     = { path = "../biome_test_utils" }
 camino               = { workspace = true }
 countme              = { workspace = true, features = ["enable"] }
diff --git a/crates/biome_html_parser/Cargo.toml b/crates/biome_html_parser/Cargo.toml
index 2bd0512a6148..61267563268a 100644
--- a/crates/biome_html_parser/Cargo.toml
+++ b/crates/biome_html_parser/Cargo.toml
@@ -26,8 +26,8 @@ biome_unicode_table = { workspace = true }
 tracing             = { workspace = true }
 
 [dev-dependencies]
-biome_string_case = { workspace = true }
-biome_test_utils  = { workspace = true }
+biome_string_case = { path = "../biome_string_case" }
+biome_test_utils  = { path = "../biome_test_utils" }
 camino            = { workspace = true }
 criterion         = { package = "codspeed-criterion-compat", version = "*" }
 insta             = { workspace = true }
diff --git a/crates/biome_js_analyze/Cargo.toml b/crates/biome_js_analyze/Cargo.toml
index 9deacca8e9aa..c23f8477479c 100644
--- a/crates/biome_js_analyze/Cargo.toml
+++ b/crates/biome_js_analyze/Cargo.toml
@@ -57,10 +57,10 @@ serde                    = { workspace = true, features = ["derive"] }
 smallvec                 = { workspace = true }
 
 [dev-dependencies]
-biome_fs            = { workspace = true }
+biome_fs            = { path = "../biome_fs" }
 biome_js_parser     = { path = "../biome_js_parser", features = ["tests"] }
-biome_plugin_loader = { workspace = true }
-biome_service       = { workspace = true }
+biome_plugin_loader = { path = "../biome_plugin_loader" }
+biome_service       = { path = "../biome_service" }
 biome_test_utils    = { path = "../biome_test_utils" }
 criterion           = { package = "codspeed-criterion-compat", version = "*" }
 insta               = { workspace = true, features = ["glob"] }
diff --git a/crates/biome_js_formatter/Cargo.toml b/crates/biome_js_formatter/Cargo.toml
index de01910e44ef..f8dd6a948a48 100644
--- a/crates/biome_js_formatter/Cargo.toml
+++ b/crates/biome_js_formatter/Cargo.toml
@@ -40,7 +40,7 @@ smallvec                     = { workspace = true }
 unicode-width                = { workspace = true }
 
 [dev-dependencies]
-biome_formatter      = { workspace = true, features = ["countme"] }
+biome_formatter      = { path = "../biome_formatter", features = ["countme"] }
 biome_formatter_test = { path = "../biome_formatter_test" }
 biome_fs             = { path = "../biome_fs" }
 biome_js_factory     = { path = "../biome_js_factory" }
diff --git a/crates/biome_js_parser/Cargo.toml b/crates/biome_js_parser/Cargo.toml
index f795d64a08aa..fc1663eb2ec5 100644
--- a/crates/biome_js_parser/Cargo.toml
+++ b/crates/biome_js_parser/Cargo.toml
@@ -38,11 +38,11 @@ smallvec            = { workspace = true }
 tracing             = { workspace = true }
 
 [dev-dependencies]
-biome_configuration = { workspace = true }
-biome_deserialize   = { workspace = true }
-biome_fs            = { workspace = true }
-biome_service       = { workspace = true }
-biome_test_utils    = { workspace = true }
+biome_configuration = { path = "../biome_configuration" }
+biome_deserialize   = { path = "../biome_deserialize" }
+biome_fs            = { path = "../biome_fs" }
+biome_service       = { path = "../biome_service" }
+biome_test_utils    = { path = "../biome_test_utils" }
 camino              = { workspace = true }
 criterion           = { package = "codspeed-criterion-compat", version = "*" }
 insta               = { workspace = true }
diff --git a/crates/biome_js_type_info/Cargo.toml b/crates/biome_js_type_info/Cargo.toml
index ecb626a8f0a7..169a1196c03f 100644
--- a/crates/biome_js_type_info/Cargo.toml
+++ b/crates/biome_js_type_info/Cargo.toml
@@ -24,9 +24,9 @@ paste                     = "1.0.15"
 rustc-hash                = { workspace = true }
 
 [dev-dependencies]
-biome_js_formatter = { workspace = true }
-biome_js_parser    = { workspace = true }
-biome_test_utils   = { workspace = true }
+biome_js_formatter = { path = "../biome_js_formatter" }
+biome_js_parser    = { path = "../biome_js_parser" }
+biome_test_utils   = { path = "../biome_test_utils" }
 insta              = { workspace = true }
 
 [lints]
diff --git a/crates/biome_json_analyze/Cargo.toml b/crates/biome_json_analyze/Cargo.toml
index 286653753ca7..a060b951009d 100644
--- a/crates/biome_json_analyze/Cargo.toml
+++ b/crates/biome_json_analyze/Cargo.toml
@@ -33,7 +33,7 @@ camino               = { workspace = true }
 rustc-hash           = { workspace = true }
 
 [dev-dependencies]
-biome_configuration = { workspace = true }
+biome_configuration = { path = "../biome_configuration" }
 biome_json_parser   = { path = "../biome_json_parser" }
 biome_test_utils    = { path = "../biome_test_utils" }
 criterion           = { package = "codspeed-criterion-compat", version = "*" }
diff --git a/crates/biome_json_formatter/Cargo.toml b/crates/biome_json_formatter/Cargo.toml
index ba72376c31f1..33bfbf254039 100644
--- a/crates/biome_json_formatter/Cargo.toml
+++ b/crates/biome_json_formatter/Cargo.toml
@@ -34,7 +34,7 @@ schemars                 = { workspace = true, optional = true }
 serde                    = { workspace = true, features = ["derive"], optional = true }
 
 [dev-dependencies]
-biome_formatter      = { workspace = true, features = ["countme"] }
+biome_formatter      = { path = "../biome_formatter", features = ["countme"] }
 biome_formatter_test = { path = "../biome_formatter_test" }
 biome_fs             = { path = "../biome_fs" }
 biome_json_parser    = { path = "../biome_json_parser" }
diff --git a/crates/biome_json_parser/Cargo.toml b/crates/biome_json_parser/Cargo.toml
index 5382088f2678..bc9920ceefa5 100644
--- a/crates/biome_json_parser/Cargo.toml
+++ b/crates/biome_json_parser/Cargo.toml
@@ -31,7 +31,7 @@ tracing             = { workspace = true }
 unicode-bom         = { workspace = true }
 
 [dev-dependencies]
-biome_test_utils  = { workspace = true }
+biome_test_utils  = { path = "../biome_test_utils" }
 criterion         = { package = "codspeed-criterion-compat", version = "*" }
 insta             = { workspace = true }
 quickcheck        = { workspace = true }
diff --git a/crates/biome_json_value/Cargo.toml b/crates/biome_json_value/Cargo.toml
index 21795923a088..dedcd039ad7a 100644
--- a/crates/biome_json_value/Cargo.toml
+++ b/crates/biome_json_value/Cargo.toml
@@ -21,7 +21,7 @@ rustc-hash               = { workspace = true }
 static_assertions        = { workspace = true }
 
 [dev-dependencies]
-biome_json_parser = { workspace = true }
+biome_json_parser = { path = "../biome_json_parser" }
 
 [lints]
 workspace = true
diff --git a/crates/biome_markdown_formatter/Cargo.toml b/crates/biome_markdown_formatter/Cargo.toml
index 60aacd79484b..12ad4b029f65 100644
--- a/crates/biome_markdown_formatter/Cargo.toml
+++ b/crates/biome_markdown_formatter/Cargo.toml
@@ -18,11 +18,11 @@ schemars               = { workspace = true, optional = true }
 serde                  = { workspace = true, features = ["derive"], optional = true }
 
 [dev-dependencies]
-biome_configuration   = { workspace = true }
-biome_formatter_test  = { workspace = true }
+biome_configuration   = { path = "../biome_configuration" }
+biome_formatter_test  = { path = "../biome_formatter_test" }
 biome_fs              = { path = "../biome_fs" }
-biome_markdown_parser = { workspace = true }
-biome_parser          = { workspace = true }
+biome_markdown_parser = { path = "../biome_markdown_parser" }
+biome_parser          = { path = "../biome_parser" }
 biome_service         = { path = "../biome_service", features = ["markdown"] }
 camino                = { workspace = true }
 countme               = { workspace = true, features = ["enable"] }
diff --git a/crates/biome_module_graph/Cargo.toml b/crates/biome_module_graph/Cargo.toml
index b7b7b297fce1..c0e75c979229 100644
--- a/crates/biome_module_graph/Cargo.toml
+++ b/crates/biome_module_graph/Cargo.toml
@@ -42,12 +42,12 @@ serde_json           = { workspace = true }
 static_assertions    = { workspace = true }
 
 [dev-dependencies]
-biome_deserialize  = { workspace = true }
-biome_js_formatter = { workspace = true }
-biome_js_parser    = { workspace = true }
-biome_json_parser  = { workspace = true }
-biome_json_value   = { workspace = true }
-biome_test_utils   = { workspace = true }
+biome_deserialize  = { path = "../biome_deserialize" }
+biome_js_formatter = { path = "../biome_js_formatter" }
+biome_js_parser    = { path = "../biome_js_parser" }
+biome_json_parser  = { path = "../biome_json_parser" }
+biome_json_value   = { path = "../biome_json_value" }
+biome_test_utils   = { path = "../biome_test_utils" }
 divan              = { package = "codspeed-divan-compat", version = "=4.2.1" }
 insta              = { workspace = true }
 walkdir            = { workspace = true }
diff --git a/crates/biome_plugin_loader/Cargo.toml b/crates/biome_plugin_loader/Cargo.toml
index 4f14221ed983..e5ef7dc4dc79 100644
--- a/crates/biome_plugin_loader/Cargo.toml
+++ b/crates/biome_plugin_loader/Cargo.toml
@@ -38,7 +38,7 @@ schemars                 = { workspace = true, optional = true }
 serde                    = { workspace = true }
 
 [dev-dependencies]
-biome_js_parser = { workspace = true }
+biome_js_parser = { path = "../biome_js_parser" }
 insta           = { workspace = true }
 
 [target.'cfg(unix)'.dependencies]
diff --git a/crates/biome_service/Cargo.toml b/crates/biome_service/Cargo.toml
index da6d7e644097..4e61f6f46d8e 100644
--- a/crates/biome_service/Cargo.toml
+++ b/crates/biome_service/Cargo.toml
@@ -86,7 +86,7 @@ tracing                  = { workspace = true, features = ["attributes", "log"]
 web-time                 = { workspace = true }
 
 [dev-dependencies]
-biome_configuration = { workspace = true, features = ["test-utils"] }
+biome_configuration = { path = "../biome_configuration", features = ["test-utils"] }
 insta               = { workspace = true }
 
 [features]
diff --git a/crates/biome_tailwind_parser/Cargo.toml b/crates/biome_tailwind_parser/Cargo.toml
index bfe2f2f48143..9e32906f1f17 100644
--- a/crates/biome_tailwind_parser/Cargo.toml
+++ b/crates/biome_tailwind_parser/Cargo.toml
@@ -26,7 +26,7 @@ biome_unicode_table    = { workspace = true }
 tracing                = { workspace = true }
 
 [dev-dependencies]
-biome_test_utils  = { workspace = true }
+biome_test_utils  = { path = "../biome_test_utils" }
 camino            = { workspace = true }
 criterion         = { package = "codspeed-criterion-compat", version = "*" }
 insta             = { workspace = true }
diff --git a/crates/biome_yaml_formatter/Cargo.toml b/crates/biome_yaml_formatter/Cargo.toml
index cba11db73f85..a74ba160cbcd 100644
--- a/crates/biome_yaml_formatter/Cargo.toml
+++ b/crates/biome_yaml_formatter/Cargo.toml
@@ -28,7 +28,7 @@ schemars          = { workspace = true, optional = true }
 serde             = { workspace = true, features = ["derive"], optional = true }
 
 [dev-dependencies]
-biome_formatter   = { workspace = true, features = ["countme"] }
+biome_formatter   = { path = "../biome_formatter", features = ["countme"] }
 biome_yaml_parser = { path = "../biome_yaml_parser" }
 
 [features]
diff --git a/crates/biome_yaml_parser/Cargo.toml b/crates/biome_yaml_parser/Cargo.toml
index d7a88ae62ed5..9181ae0e576b 100644
--- a/crates/biome_yaml_parser/Cargo.toml
+++ b/crates/biome_yaml_parser/Cargo.toml
@@ -22,7 +22,7 @@ biome_yaml_syntax   = { workspace = true }
 tracing             = { workspace = true }
 
 [dev-dependencies]
-biome_test_utils  = { workspace = true }
+biome_test_utils  = { path = "../biome_test_utils" }
 insta             = { workspace = true }
 quickcheck        = { workspace = true }
 quickcheck_macros = { workspace = true }