diff --git a/.gitignore b/.gitignore
index bbee93a..efdbcfb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
 /.direnv
-/rust-checks/target
 /result*
 /target
diff --git a/Cargo.lock b/Cargo.lock
index cadee28..edb0f7f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,15 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "anstream"
 version = "0.6.14"
@@ -51,6 +60,12 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "autocfg"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c4b4d0bd25bd0b74681c0ad21497610ce1b7c91b1022cd21c80c6fbdd9476b0"
+
 [[package]]
 name = "clap"
 version = "4.5.4"
@@ -91,12 +106,43 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "98cc8fbded0c607b7ba9dd60cd98df59af97e84d24e49c8557331cfc26d301ce"
 
+[[package]]
+name = "codespan"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3362992a0d9f1dd7c3d0e89e0ab2bb540b7a95fea8cd798090e758fda2899b5e"
+dependencies = [
+ "codespan-reporting",
+]
+
+[[package]]
+name = "codespan-reporting"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
+dependencies = [
+ "termcolor",
+ "unicode-width",
+]
+
 [[package]]
 name = "colorchoice"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b6a852b24ab71dffc585bcb46eaf7959d175cb865a7152e35b348d1b2960422"
 
+[[package]]
+name = "countme"
+version = "3.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7704b5fdd17b18ae31c4c1da5a2e0305a2bf17b5249300a9ee9ed7b72114c636"
+
+[[package]]
+name = "hashbrown"
+version = "0.14.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5274423e17b7c9fc20b6e7e208532f9b19825d82dfd615708b70edd83df41f1"
+
 [[package]]
 name = "heck"
 version = "0.5.0"
@@ -121,12 +167,28 @@ version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49f1f14873335454500d59611f1cf4a4b0f786f9ac11f4312a78e4cf2566695b"
 
+[[package]]
+name = "memchr"
+version = "2.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c8640c5d730cb13ebd907d8d04b52f55ac9a2eec55b440c8892f40d56c76c1d"
+
+[[package]]
+name = "memoffset"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "488016bfae457b036d996092f6cb448677611ce4449e970ceaf42695203f218a"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "nixpkgs-hammering"
 version = "0.1.0"
 dependencies = [
  "clap",
  "indoc",
+ "rust-checks",
  "serde",
  "serde_json",
 ]
@@ -149,6 +211,76 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "regex"
+version = "1.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c117dbdfde9c8308975b6a18d71f3f385c89461f7b3fb054288ecf2a2058ba4c"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "86b83b8b9847f9bf95ef68afb0b8e6cdb80f498442f5179a29fad448fcc1eaea"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "adad44e29e4c806119491a7f06f03de4d1af22c3a680dd47f1e6e179439d1f56"
+
+[[package]]
+name = "rnix"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bb35cedbeb70e0ccabef2a31bcff0aebd114f19566086300b8f42c725fc2cb5f"
+dependencies = [
+ "rowan",
+]
+
+[[package]]
+name = "rowan"
+version = "0.15.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a58fa8a7ccff2aec4f39cc45bf5f985cec7125ab271cf681c279fd00192b49"
+dependencies = [
+ "countme",
+ "hashbrown",
+ "memoffset",
+ "rustc-hash",
+ "serde",
+ "text-size",
+]
+
+[[package]]
+name = "rust-checks"
+version = "0.0.0"
+dependencies = [
+ "codespan",
+ "regex",
+ "rnix",
+ "rowan",
+ "serde",
+ "serde_json",
+]
+
+[[package]]
+name = "rustc-hash"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
+
 [[package]]
 name = "ryu"
 version = "1.0.18"
@@ -203,18 +335,51 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "termcolor"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06794f8f6c5c898b3275aebefa6b8a1cb24cd2c6c79397ab15774837a0bc5755"
+dependencies = [
+ "winapi-util",
+]
+
+[[package]]
+name = "text-size"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f18aa187839b2bdb1ad2fa35ead8c4c2976b64e4363c386d45ac0f7ee85c9233"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
+[[package]]
+name = "unicode-width"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68f5e5f3158ecfd4b8ff6fe086db7c8467a2dfdac97fe420f2b7c4aa97af66d6"
+
 [[package]]
 name = "utf8parse"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
 
+[[package]]
+name = "winapi-util"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d4cc384e1e73b93bafa6fb4f1df8c41695c8a91cf9c4c64358067d15a7b6c6b"
+dependencies = [
+ "windows-sys",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.52.0"
diff --git a/Cargo.toml b/Cargo.toml
index 92c9c8d..b389031 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,5 +11,13 @@ path = "src/main.rs"
 [dependencies]
 clap = { version = "4.5.4", features = ["derive"] }
 indoc = "2.0.5"
+serde = { workspace = true }
+serde_json = { workspace = true }
+rust-checks = { path = "./rust-checks" }
+
+[workspace]
+members = ["rust-checks"]
+
+[workspace.dependencies]
 serde = { version = "1.0.203", features = ["serde_derive"] }
 serde_json = "1.0.117"
diff --git a/flake.nix b/flake.nix
index d3b4b44..f78b000 100644
--- a/flake.nix
+++ b/flake.nix
@@ -20,53 +20,34 @@
 
         {
           nixpkgs-hammering =
-            let
-              rust-checks = prev.rustPlatform.buildRustPackage {
-                pname = "rust-checks";
-                version = (prev.lib.importTOML ./rust-checks/Cargo.toml).package.version;
-                src = ./rust-checks;
-                cargoLock.lockFile = ./rust-checks/Cargo.lock;
-              };
-
-              # Find all of the binaries installed by rust-checks. Note, if this changes
-              # in the future to use wrappers or something else that pollute the bin/
-              # directory, this logic will have to grow.
-              rust-check-names = let
-                binContents = builtins.readDir "${rust-checks}/bin";
-              in
-                prev.lib.mapAttrsToList (name: type: assert type == "regular"; name) binContents;
-            in
-              prev.rustPlatform.buildRustPackage {
-                pname = "nixpkgs-hammering";
-                version = (prev.lib.importTOML ./Cargo.toml).package.version;
-                src = ./.;
+            prev.rustPlatform.buildRustPackage {
+              pname = "nixpkgs-hammering";
+              version = (prev.lib.importTOML ./Cargo.toml).package.version;
+              src = ./.;
 
-                cargoLock.lockFile = ./Cargo.lock;
+              cargoLock.lockFile = ./Cargo.lock;
 
-                nativeBuildInputs = with prev; [
-                  makeWrapper
-                ];
+              nativeBuildInputs = with prev; [
+                makeWrapper
+              ];
 
-                passthru = {
-                  inherit rust-checks;
-                  exePath = "/bin/nixpkgs-hammer";
-                };
+              passthru = {
+                exePath = "/bin/nixpkgs-hammer";
+              };
 
-                postInstall = ''
-                  datadir="$out/share/nixpkgs-hammering"
-                  mkdir -p "$datadir"
+              postInstall = ''
+                datadir="$out/share/nixpkgs-hammering"
+                mkdir -p "$datadir"
 
-                  wrapProgram "$out/bin/nixpkgs-hammer" \
-                      --prefix PATH ":" ${prev.lib.makeBinPath [
-                        prev.nix
-                        rust-checks
-                      ]} \
-                      --set AST_CHECK_NAMES ${prev.lib.concatStringsSep ":" rust-check-names} \
-                      --set OVERLAYS_DIR "$datadir/overlays"
-                  cp -r ${./overlays} "$datadir/overlays"
-                  cp -r ${./lib} "$datadir/lib"
-                '';
-              };
+                wrapProgram "$out/bin/nixpkgs-hammer" \
+                    --prefix PATH ":" ${prev.lib.makeBinPath [
+                      prev.nix
+                    ]} \
+                    --set OVERLAYS_DIR "$datadir/overlays"
+                cp -r ${./overlays} "$datadir/overlays"
+                cp -r ${./lib} "$datadir/lib"
+              '';
+            };
         };
     };
   } // utils.lib.eachDefaultSystem (system: let
diff --git a/rust-checks/Cargo.lock b/rust-checks/Cargo.lock
deleted file mode 100644
index ec034bc..0000000
--- a/rust-checks/Cargo.lock
+++ /dev/null
@@ -1,318 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "aho-corasick"
-version = "1.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
-dependencies = [
- "memchr",
-]
-
-[[package]]
-name = "autocfg"
-version = "1.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c4b4d0bd25bd0b74681c0ad21497610ce1b7c91b1022cd21c80c6fbdd9476b0"
-
-[[package]]
-name = "codespan"
-version = "0.11.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3362992a0d9f1dd7c3d0e89e0ab2bb540b7a95fea8cd798090e758fda2899b5e"
-dependencies = [
- "codespan-reporting",
-]
-
-[[package]]
-name = "codespan-reporting"
-version = "0.11.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
-dependencies = [
- "termcolor",
- "unicode-width",
-]
-
-[[package]]
-name = "countme"
-version = "3.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7704b5fdd17b18ae31c4c1da5a2e0305a2bf17b5249300a9ee9ed7b72114c636"
-
-[[package]]
-name = "hashbrown"
-version = "0.14.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5274423e17b7c9fc20b6e7e208532f9b19825d82dfd615708b70edd83df41f1"
-
-[[package]]
-name = "itoa"
-version = "1.0.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "49f1f14873335454500d59611f1cf4a4b0f786f9ac11f4312a78e4cf2566695b"
-
-[[package]]
-name = "memchr"
-version = "2.7.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c8640c5d730cb13ebd907d8d04b52f55ac9a2eec55b440c8892f40d56c76c1d"
-
-[[package]]
-name = "memoffset"
-version = "0.9.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "488016bfae457b036d996092f6cb448677611ce4449e970ceaf42695203f218a"
-dependencies = [
- "autocfg",
-]
-
-[[package]]
-name = "proc-macro2"
-version = "1.0.84"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec96c6a92621310b51366f1e28d05ef11489516e93be030060e5fc12024a49d6"
-dependencies = [
- "unicode-ident",
-]
-
-[[package]]
-name = "quote"
-version = "1.0.36"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fa76aaf39101c457836aec0ce2316dbdc3ab723cdda1c6bd4e6ad4208acaca7"
-dependencies = [
- "proc-macro2",
-]
-
-[[package]]
-name = "regex"
-version = "1.10.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c117dbdfde9c8308975b6a18d71f3f385c89461f7b3fb054288ecf2a2058ba4c"
-dependencies = [
- "aho-corasick",
- "memchr",
- "regex-automata",
- "regex-syntax",
-]
-
-[[package]]
-name = "regex-automata"
-version = "0.4.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "86b83b8b9847f9bf95ef68afb0b8e6cdb80f498442f5179a29fad448fcc1eaea"
-dependencies = [
- "aho-corasick",
- "memchr",
- "regex-syntax",
-]
-
-[[package]]
-name = "regex-syntax"
-version = "0.8.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "adad44e29e4c806119491a7f06f03de4d1af22c3a680dd47f1e6e179439d1f56"
-
-[[package]]
-name = "rnix"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb35cedbeb70e0ccabef2a31bcff0aebd114f19566086300b8f42c725fc2cb5f"
-dependencies = [
- "rowan",
-]
-
-[[package]]
-name = "rowan"
-version = "0.15.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32a58fa8a7ccff2aec4f39cc45bf5f985cec7125ab271cf681c279fd00192b49"
-dependencies = [
- "countme",
- "hashbrown",
- "memoffset",
- "rustc-hash",
- "serde",
- "text-size",
-]
-
-[[package]]
-name = "rust-checks"
-version = "0.0.0"
-dependencies = [
- "codespan",
- "regex",
- "rnix",
- "rowan",
- "serde",
- "serde_json",
-]
-
-[[package]]
-name = "rustc-hash"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
-
-[[package]]
-name = "ryu"
-version = "1.0.18"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f3cb5ba0dc43242ce17de99c180e96db90b235b8a9fdc9543c96d2209116bd9f"
-
-[[package]]
-name = "serde"
-version = "1.0.203"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7253ab4de971e72fb7be983802300c30b5a7f0c2e56fab8abfc6a214307c0094"
-dependencies = [
- "serde_derive",
-]
-
-[[package]]
-name = "serde_derive"
-version = "1.0.203"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "500cbc0ebeb6f46627f50f3f5811ccf6bf00643be300b4c3eabc0ef55dc5b5ba"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
-[[package]]
-name = "serde_json"
-version = "1.0.117"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "455182ea6142b14f93f4bc5320a2b31c1f266b66a4a5c858b013302a5d8cbfc3"
-dependencies = [
- "itoa",
- "ryu",
- "serde",
-]
-
-[[package]]
-name = "syn"
-version = "2.0.66"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c42f3f41a2de00b01c0aaad383c5a45241efc8b2d1eda5661812fda5f3cdcff5"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
-[[package]]
-name = "termcolor"
-version = "1.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06794f8f6c5c898b3275aebefa6b8a1cb24cd2c6c79397ab15774837a0bc5755"
-dependencies = [
- "winapi-util",
-]
-
-[[package]]
-name = "text-size"
-version = "1.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f18aa187839b2bdb1ad2fa35ead8c4c2976b64e4363c386d45ac0f7ee85c9233"
-dependencies = [
- "serde",
-]
-
-[[package]]
-name = "unicode-ident"
-version = "1.0.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
-
-[[package]]
-name = "unicode-width"
-version = "0.1.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "68f5e5f3158ecfd4b8ff6fe086db7c8467a2dfdac97fe420f2b7c4aa97af66d6"
-
-[[package]]
-name = "winapi-util"
-version = "0.1.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d4cc384e1e73b93bafa6fb4f1df8c41695c8a91cf9c4c64358067d15a7b6c6b"
-dependencies = [
- "windows-sys",
-]
-
-[[package]]
-name = "windows-sys"
-version = "0.52.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
-dependencies = [
- "windows-targets",
-]
-
-[[package]]
-name = "windows-targets"
-version = "0.52.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
-dependencies = [
- "windows_aarch64_gnullvm",
- "windows_aarch64_msvc",
- "windows_i686_gnu",
- "windows_i686_gnullvm",
- "windows_i686_msvc",
- "windows_x86_64_gnu",
- "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
-]
-
-[[package]]
-name = "windows_aarch64_gnullvm"
-version = "0.52.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
-
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-
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-
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diff --git a/rust-checks/Cargo.toml b/rust-checks/Cargo.toml
index dfd8eb3..b9a6ebb 100644
--- a/rust-checks/Cargo.toml
+++ b/rust-checks/Cargo.toml
@@ -9,5 +9,5 @@ codespan = "0.11"
 regex = "1"
 rnix = "0.11"
 rowan = { version = "0.15", features = [ "serde1" ] }
-serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
+serde = { workspace = true }
+serde_json = { workspace = true }
diff --git a/rust-checks/src/checks/mod.rs b/rust-checks/src/checks/mod.rs
index 03cbe85..0db651a 100644
--- a/rust-checks/src/checks/mod.rs
+++ b/rust-checks/src/checks/mod.rs
@@ -4,8 +4,22 @@ mod no_uri_literals;
 mod stale_substitute;
 mod unused_argument;
 
+use std::error::Error;
+
 pub use missing_patch_comment::run as missing_patch_comment;
 pub use no_python_tests::run as no_python_tests;
 pub use no_uri_literals::run as no_uri_literals;
 pub use stale_substitute::run as stale_substitute;
 pub use unused_argument::run as unused_argument;
+
+use crate::common_structs::CheckedAttr;
+
+pub type Check = fn(Vec<CheckedAttr>) -> Result<String, Box<dyn Error>>;
+
+pub const ALL: [(&'static str, Check); 5] = [
+    ("missing-patch-comment", missing_patch_comment),
+    ("no-python-tests", no_python_tests),
+    ("no-uri-literals", no_uri_literals),
+    ("stale-substitute", stale_substitute),
+    ("unused-argument", unused_argument),
+];
diff --git a/rust-checks/src/common_structs.rs b/rust-checks/src/common_structs.rs
index 80ed590..5bd06f0 100644
--- a/rust-checks/src/common_structs.rs
+++ b/rust-checks/src/common_structs.rs
@@ -2,7 +2,7 @@ use codespan::{ByteIndex, FileId, Files};
 use serde::{Deserialize, Serialize};
 use std::error::Error;
 
-#[derive(Serialize, Deserialize, Debug)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct CheckedAttr {
     pub name: String,
     pub location: Option<SourceLocation>,
diff --git a/src/lib.rs b/src/lib.rs
index 6ad25bd..ef0a13c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,6 @@
 use indoc::formatdoc;
 use model::{CheckedAttr, Report, Severity, SourceLocation};
+use rust_checks::checks::{self, Check};
 use serde::{Deserialize, Serialize};
 use std::{
     collections::{HashMap, HashSet},
@@ -35,22 +36,19 @@ fn get_overlays_dir() -> Result<PathBuf, String> {
     Err("Either ‘OVERLAYS_DIR’ or ‘CARGO_MANIFEST_DIR’ environment variable expected.".to_owned())
 }
 
-fn get_check_programs() -> Result<HashSet<String>, String> {
-    // Each rule that is implemented as an external check program rather
-    // than an overlay is installed onto our PATH, and the names of the
-    // rules put into this environment variable.
-    Ok(optional_env("AST_CHECK_NAMES")?.map_or_else(
-        || HashSet::new(),
-        |ast_checks| HashSet::from_iter(ast_checks.split(":").map(ToOwned::to_owned)),
-    ))
+fn get_check_programs(excluded_rules: &HashSet<String>) -> HashMap<String, Check> {
+    checks::ALL
+        .into_iter()
+        .map(|(name, check)| (name.to_string(), check))
+        .filter(|(name, _)| !excluded_rules.contains(name))
+        .collect()
 }
 
 fn run_external_checks(
     attrs: &[CheckedAttr],
     excluded_rules: &HashSet<String>,
 ) -> Result<HashMap<String, Vec<Report>>, String> {
-    let check_programs = get_check_programs()?;
-    let rules = &check_programs - &excluded_rules;
+    let rules = get_check_programs(excluded_rules);
     if rules.is_empty() {
         return Ok(HashMap::new());
     }
@@ -81,24 +79,28 @@ fn run_external_checks(
         }
     }
 
-    for rule in rules {
-        let json_text = run_command_with_input(&rule, &[], &encoded_attrs).map_err(|err| {
+    let mut rc_attrs = Vec::with_capacity(attrs.len());
+    for attr in attrs {
+        rc_attrs.push(attr.clone().try_into()?);
+    }
+    for (name, check) in rules {
+        let json_text = check(rc_attrs.clone()).map_err(|err| {
             eprintln!(
                 "{}",
                 red(&format!(
-                    "Rule ‘{rule}’ failed with input ‘{encoded_attrs}’.\
+                    "Rule ‘{name}’ failed with input ‘{encoded_attrs}’.\
                     This is a bug. Please file a ticket on GitHub."
                 ))
             );
 
-            format!("Unable to execute rule ‘{rule}’: {}", err.to_string())
+            format!("Unable to execute rule ‘{name}’: {}", err.to_string())
         })?;
 
         if !json_text.is_empty() {
             let results: HashMap<String, Vec<Report>> =
                 serde_json::from_str(&json_text).map_err(|err| {
                     format!(
-                        "Unable to parse result of rule ‘{rule}’: {}",
+                        "Unable to parse result of rule ‘{name}’: {}",
                         err.to_string()
                     )
                 })?;
diff --git a/src/model.rs b/src/model.rs
index 79f88e2..e55668e 100644
--- a/src/model.rs
+++ b/src/model.rs
@@ -1,3 +1,4 @@
+use rust_checks::common_structs;
 use serde::{Deserialize, Serialize};
 use std::{fmt::Display, path::PathBuf};
 
@@ -25,6 +26,26 @@ pub struct SourceLocation {
     pub column: Option<usize>,
 }
 
+fn pb_to_string(buf: PathBuf) -> Result<String, String> {
+    Ok(buf
+        .to_str()
+        .ok_or_else(|| format!("File path ‘{}’ not a valid UTF-8 string", buf.display()))?
+        .to_owned())
+}
+
+impl TryInto<common_structs::SourceLocation> for SourceLocation {
+    type Error = String;
+
+    fn try_into(self) -> Result<common_structs::SourceLocation, Self::Error> {
+        let SourceLocation { file, line, column } = self;
+        Ok(common_structs::SourceLocation {
+            file: pb_to_string(file)?,
+            line,
+            column,
+        })
+    }
+}
+
 fn default_link() -> bool {
     true
 }
@@ -56,3 +77,27 @@ pub struct CheckedAttr {
     /// path the the output of the drv in the nix store, if exists
     pub output: Option<PathBuf>,
 }
+
+impl TryInto<common_structs::CheckedAttr> for CheckedAttr {
+    type Error = String;
+
+    fn try_into(self) -> Result<common_structs::CheckedAttr, Self::Error> {
+        let CheckedAttr {
+            name,
+            location,
+            drv,
+            output,
+        } = self;
+
+        let location = location.map(|l| l.try_into()).transpose()?;
+        let drv = drv.map(pb_to_string).transpose()?;
+        let output = output.map(pb_to_string).transpose()?;
+
+        Ok(common_structs::CheckedAttr {
+            name,
+            location,
+            drv,
+            output,
+        })
+    }
+}