diff --git a/core/package.json b/core/package.json
index 8db05a2..c2aeb6e 100644
--- a/core/package.json
+++ b/core/package.json
@@ -32,7 +32,7 @@
     "@dqbd/tiktoken": "^1.0.7",
     "gitignore-parser": "^0.0.2",
     "gray-matter": "^4.0.3",
-    "mime-types": "^2.1.35",
+    "istextorbinary": "^9.5.0",
     "mustache": "^4.2.0",
     "openai": "^4.11.1",
     "temporal-polyfill": "^0.2.4",
@@ -40,7 +40,6 @@
     "yaml": "^2.4.1"
   },
   "devDependencies": {
-    "@types/mime-types": "^2.1.4",
     "@types/mustache": "^4.2.5",
     "vitest": "^1.5.0"
   }
diff --git a/core/src/content/gitignore_fs.ts b/core/src/content/gitignore_fs.ts
index e796c8d..c679bcd 100644
--- a/core/src/content/gitignore_fs.ts
+++ b/core/src/content/gitignore_fs.ts
@@ -1,6 +1,6 @@
 import { FileSystem, SEP } from "@davidsouther/jiffies/lib/cjs/fs.js";
 import { join, normalize } from "path";
-import { contentType } from "mime-types";
+import { isText } from "istextorbinary";
 import * as gitignoreParser from "gitignore-parser";
 
 export class GitignoreFs extends FileSystem {
@@ -25,9 +25,10 @@ export class GitignoreFs extends FileSystem {
       });
     }
     const paths = await this.adapter.scandir(path);
+    const nameFilter = [".gitignore", ".git"];
     const filtered = paths.filter(
       (p) =>
-        p.name !== ".git" &&
+        !nameFilter.includes(p.name) &&
         (p.isDirectory() || isTextExtension(p.name)) &&
         gitignores.every((g) =>
           p.isDirectory() ? g.accepts(p.name + "/") : g.accepts(p.name)
@@ -38,10 +39,5 @@ export class GitignoreFs extends FileSystem {
 }
 
 function isTextExtension(name: string) {
-  const overrides = ["go", "ts"];
-  if (overrides.includes(name.split(".").pop() || "")) {
-    return true;
-  }
-  const contType = contentType(name) || "";
-  return contType.startsWith("text") || contType.startsWith("application");
+  return isText(name);
 }
diff --git a/package-lock.json b/package-lock.json
index a83900d..9642db7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,10 +14,10 @@
     },
     "cli": {
       "name": "@ailly/cli",
-      "version": "1.5.0",
+      "version": "1.5.1",
       "license": "ISC",
       "dependencies": {
-        "@ailly/core": "1.5.0",
+        "@ailly/core": "1.5.1",
         "@davidsouther/jiffies": "^2.2.4",
         "yaml": "^2.4.1"
       },
@@ -33,7 +33,7 @@
     },
     "core": {
       "name": "@ailly/core",
-      "version": "1.5.0",
+      "version": "1.5.1",
       "license": "ISC",
       "dependencies": {
         "@aws-sdk/client-bedrock-runtime": "^3.427.0",
@@ -42,7 +42,7 @@
         "@dqbd/tiktoken": "^1.0.7",
         "gitignore-parser": "^0.0.2",
         "gray-matter": "^4.0.3",
-        "mime-types": "^2.1.35",
+        "istextorbinary": "^9.5.0",
         "mustache": "^4.2.0",
         "openai": "^4.11.1",
         "temporal-polyfill": "^0.2.4",
@@ -50,7 +50,6 @@
         "yaml": "^2.4.1"
       },
       "devDependencies": {
-        "@types/mime-types": "^2.1.4",
         "@types/mustache": "^4.2.5",
         "vitest": "^1.5.0"
       },
@@ -60,9 +59,9 @@
     },
     "extension": {
       "name": "ailly",
-      "version": "1.5.0",
+      "version": "1.5.1",
       "dependencies": {
-        "@ailly/core": "1.5.0",
+        "@ailly/core": "1.5.1",
         "@davidsouther/jiffies": "^2.1.3"
       },
       "devDependencies": {
@@ -3704,12 +3703,6 @@
         "@types/unist": "*"
       }
     },
-    "node_modules/@types/mime-types": {
-      "version": "2.1.4",
-      "resolved": "https://registry.npmjs.org/@types/mime-types/-/mime-types-2.1.4.tgz",
-      "integrity": "sha512-lfU4b34HOri+kAY5UheuFMWPDOI+OPceBSHZKp69gEyTL/mmJ4cnU6Y/rlme3UL3GyOn6Y42hyIEw0/q8sWx5w==",
-      "dev": true
-    },
     "node_modules/@types/mocha": {
       "version": "10.0.6",
       "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-10.0.6.tgz",
@@ -4747,6 +4740,20 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/binaryextensions": {
+      "version": "6.11.0",
+      "resolved": "https://registry.npmjs.org/binaryextensions/-/binaryextensions-6.11.0.tgz",
+      "integrity": "sha512-sXnYK/Ij80TO3lcqZVV2YgfKN5QjUWIRk/XSm2J/4bd/lPko3lvk0O4ZppH6m+6hB2/GTu+ptNwVFe1xh+QLQw==",
+      "dependencies": {
+        "editions": "^6.21.0"
+      },
+      "engines": {
+        "node": ">=4"
+      },
+      "funding": {
+        "url": "https://bevry.me/fund"
+      }
+    },
     "node_modules/bl": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/bl/-/bl-4.1.0.tgz",
@@ -5777,6 +5784,20 @@
         "safe-buffer": "^5.0.1"
       }
     },
+    "node_modules/editions": {
+      "version": "6.21.0",
+      "resolved": "https://registry.npmjs.org/editions/-/editions-6.21.0.tgz",
+      "integrity": "sha512-ofkXJtn7z0urokN62DI3SBo/5xAtF0rR7tn+S/bSYV79Ka8pTajIIl+fFQ1q88DQEImymmo97M4azY3WX/nUdg==",
+      "dependencies": {
+        "version-range": "^4.13.0"
+      },
+      "engines": {
+        "node": ">=4"
+      },
+      "funding": {
+        "url": "https://bevry.me/fund"
+      }
+    },
     "node_modules/emoji-regex": {
       "version": "9.2.2",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-9.2.2.tgz",
@@ -8154,6 +8175,22 @@
         "node": ">=8"
       }
     },
+    "node_modules/istextorbinary": {
+      "version": "9.5.0",
+      "resolved": "https://registry.npmjs.org/istextorbinary/-/istextorbinary-9.5.0.tgz",
+      "integrity": "sha512-5mbUj3SiZXCuRf9fT3ibzbSSEWiy63gFfksmGfdOzujPjW3k+z8WvIBxcJHBoQNlaZaiyB25deviif2+osLmLw==",
+      "dependencies": {
+        "binaryextensions": "^6.11.0",
+        "editions": "^6.21.0",
+        "textextensions": "^6.11.0"
+      },
+      "engines": {
+        "node": ">=4"
+      },
+      "funding": {
+        "url": "https://bevry.me/fund"
+      }
+    },
     "node_modules/iterator.prototype": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/iterator.prototype/-/iterator.prototype-1.1.2.tgz",
@@ -11669,6 +11706,20 @@
       "integrity": "sha512-N+8UisAXDGk8PFXP4HAzVR9nbfmVJ3zYLAWiTIoqC5v5isinhr+r5uaO8+7r3BMfuNIufIsA7RdpVgacC2cSpw==",
       "dev": true
     },
+    "node_modules/textextensions": {
+      "version": "6.11.0",
+      "resolved": "https://registry.npmjs.org/textextensions/-/textextensions-6.11.0.tgz",
+      "integrity": "sha512-tXJwSr9355kFJI3lbCkPpUH5cP8/M0GGy2xLO34aZCjMXBaK3SoPnZwr/oWmo1FdCnELcs4npdCIOFtq9W3ruQ==",
+      "dependencies": {
+        "editions": "^6.21.0"
+      },
+      "engines": {
+        "node": ">=4"
+      },
+      "funding": {
+        "url": "https://bevry.me/fund"
+      }
+    },
     "node_modules/tinybench": {
       "version": "2.8.0",
       "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.8.0.tgz",
@@ -12229,6 +12280,17 @@
         "node": ">=12"
       }
     },
+    "node_modules/version-range": {
+      "version": "4.14.0",
+      "resolved": "https://registry.npmjs.org/version-range/-/version-range-4.14.0.tgz",
+      "integrity": "sha512-gjb0ARm9qlcBAonU4zPwkl9ecKkas+tC2CGwFfptTCWWIVTWY1YUbT2zZKsOAF1jR/tNxxyLwwG0cb42XlYcTg==",
+      "engines": {
+        "node": ">=4"
+      },
+      "funding": {
+        "url": "https://bevry.me/fund"
+      }
+    },
     "node_modules/vfile": {
       "version": "6.0.1",
       "resolved": "https://registry.npmjs.org/vfile/-/vfile-6.0.1.tgz",
@@ -13291,9 +13353,9 @@
     },
     "web": {
       "name": "@ailly/web",
-      "version": "1.5.0",
+      "version": "1.5.1",
       "dependencies": {
-        "@ailly/core": "1.5.0",
+        "@ailly/core": "1.5.1",
         "@davidsouther/jiffies": "^2.2.4",
         "marked-react": "^2.0.0",
         "react": "^18",