diff --git a/AGENTS.md b/AGENTS.md
index 2ab013a..eb4eb78 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -133,6 +133,39 @@ hand. `mergeAwsConfig()` is pure.
 - Writes go through `writeFilePreservingMode()` and are skipped when the merged
   contents are unchanged.
 
+## `~/.kube/config` ownership
+
+`src/kubeconfig.ts` merges into the user's file for the same reason
+`aws-config.ts` does: most of it is theirs. `mergeKubeconfig()` is pure.
+
+- The parsed YAML document is **edited in place**, never rebuilt from a model of
+  a kubeconfig. Everything Frost does not write — `current-context`,
+  `preferences`, per-entry `extensions`, impersonation keys, `token-file` — is
+  in the document it was loaded from and goes back out untouched.
+- That is what `@kubernetes/client-node` got wrong, and why it is gone. Its
+  model carried only the fields it knew, so a round trip dropped the rest, and
+  its loader **throws** on an entry it dislikes — a context with no cluster,
+  which is what `kubectl config set-context x --namespace=y` writes. The throw
+  was caught at `debug` and the half-loaded config overwrote the file, taking
+  every user, every context and `current-context` with it.
+- One cluster, one user and one context per discovered cluster, named by
+  `getNamePattern()`. A same-named entry is updated **in place and by merge**,
+  so a namespace the user set on one of Frost's contexts survives a refresh.
+- A file that does not parse is **left alone**, logged at `error`. Skipping an
+  update beats replacing a file we could not read.
+- Unchanged contents skip the write. `yaml.dump` runs with `lineWidth: -1`: the
+  default 80 folds certificate data and the authenticator path across lines,
+  which is legal but unlike what `aws eks update-kubeconfig` writes.
+- Writes go through `writeFilePreservingMode()`.
+
+`getNamePattern()` picks the shortest context name that still tells the
+discovered clusters apart (`docs/docs/eks.html` has the table users see). Its
+`uniqueClusters` test compares distinct cluster **names** against distinct
+cluster **ids** (`name:account:region`) — one cluster reached through several
+profiles is one of each; two clusters sharing a name are two ids and one name.
+Comparing the two lists' lengths, as it did originally, is always true, and two
+clusters sharing a name then collapse onto one context with one of them lost.
+
 ## Cross-platform
 
 Each platform branch exists for a reason.
@@ -180,10 +213,12 @@ Each platform branch exists for a reason.
 - **electron-log v5**: import `electron-log/main` in the main process; error
   catching moved to `log.errorHandler`.
 - **update-electron-app v3**: named export.
-- **@kubernetes/client-node v2**, **electron-store v11**, **delay v7**,
-  **uuid v14**: pure ESM. The k8s client has no default export. It does not
-  declare `@types/ws` but its types reach `ws` through `isomorphic-ws`, so
-  `@types/ws` must stay a devDependency or `tsc` fails.
+- **electron-store v11**, **delay v7**, **uuid v14**: pure ESM.
+- **@kubernetes/client-node is gone, and should not come back.** It was a lossy
+  YAML shuttle for a file the app never talks to a cluster about — see
+  "`~/.kube/config` ownership". Dropping it also dropped `@types/ws`, a
+  devDependency only because the client's types reach `ws` through
+  `isomorphic-ws`.
 - **oxlint, not ESLint.** oxlint has its own parser and never loads the
   TypeScript compiler API, which is what lets this repo hold a single
   TypeScript — see the TypeScript note below. `eslint`, `typescript-eslint` and
@@ -411,6 +446,11 @@ Worth doing headlessly, since nothing else covers it:
   another directory — assert the link survives and the target changed.
 - **`src/aws-config.ts`**: the merge is pure and importable, so exercise it
   with a throwaway script (stub the logging import). Include a CRLF case.
+- **`src/kubeconfig.ts`**: `mergeKubeconfig` is pure and exported, so exercise
+  it the same way and run a real `kubectl --kubeconfig` over the output. Point
+  `AWS_IAM_AUTHENTICATOR_PATH` at a stub that prints an `ExecCredential` and
+  kubectl walks the whole exec path with no AWS account. Cover an existing
+  config carrying an entry the old loader rejected — a context with no cluster.
 - **`src/schedule.ts`**: pure and electron-free, so its delay arithmetic can be
   exercised directly.
 
diff --git a/docs/docs/eks.html b/docs/docs/eks.html
index afbdfe7..48318e3 100644
--- a/docs/docs/eks.html
+++ b/docs/docs/eks.html
@@ -167,12 +167,21 @@ <h2 id="names">How contexts are named</h2>
 
       <h2 id="merge">How the merge treats your kubeconfig</h2>
       <p>
-        Frost reads <code>~/.kube/config</code>, replaces any cluster, user or
+        Frost reads <code>~/.kube/config</code>, updates any cluster, user or
         context whose name matches one it just discovered, and writes the file
         back. Entries you added yourself — clusters from other providers, contexts
         from <code>kind</code> or Docker Desktop — are kept, as is your current
         context.
       </p>
+      <p>
+        Only the keys Frost owns are rewritten, and matched entries stay where
+        they are in the file. A namespace you set on one of Frost's contexts with
+        <code>kubectl config set-context --namespace</code> is still there after
+        the next refresh. If the file cannot be parsed at all, Frost leaves it
+        untouched and records the reason on the
+        <a href="activity.html">Activity &amp; Logs</a> page rather than writing
+        over something it could not read.
+      </p>
       <div class="callout callout-warn">
         <span class="callout-icon" aria-hidden="true">⚠️</span>
         <p>
diff --git a/docs/docs/troubleshooting.html b/docs/docs/troubleshooting.html
index 2dadb0e..fb5e4cd 100644
--- a/docs/docs/troubleshooting.html
+++ b/docs/docs/troubleshooting.html
@@ -171,6 +171,27 @@ <h4>The name is too long, or in the wrong region</h4>
 
       <h2 id="kubectl">kubectl cannot reach a cluster</h2>
 
+      <h4>Contexts you did not get from Frost disappeared after a refresh</h4>
+      <p>
+        Versions up to v0.3.2 merged into <code>~/.kube/config</code> through a
+        parser that rejected the whole file over one entry it did not like — most
+        often a context with no cluster, which is what
+        <code>kubectl config set-context <em>name</em> --namespace=<em>ns</em></code>
+        writes. The rejection was swallowed, and the file was then written from
+        what little had loaded, taking your users, your contexts and your
+        <code>current-context</code> with it. <code>kubectl</code> falls back to
+        <code>localhost:8080</code> with no current context, which is the
+        "connection to the server localhost:8080 was refused" you are probably
+        looking at.
+      </p>
+      <p>
+        Later versions edit the file in place and leave one they cannot parse
+        alone. There is nothing to recover from Frost — it keeps no copy — so
+        rebuild the entries you lost (<code>aws eks update-kubeconfig</code> for
+        EKS clusters you reach another way, or your provider's own command) and
+        run a refresh; Frost's own contexts come back on their own.
+      </p>
+
       <h4>"executable … not found" or a path error</h4>
       <p>
         The kubeconfig entry points at the authenticator inside the Frost
diff --git a/package-lock.json b/package-lock.json
index 95a580b..f4d6f68 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,6 @@
         "@aws-sdk/client-sso": "^3.1121.0",
         "@aws-sdk/client-sso-oidc": "^3.1121.0",
         "@aws-sdk/credential-providers": "^3.1121.0",
-        "@kubernetes/client-node": "^2.0.0",
         "atomically": "^2.1.1",
         "delay": "^7.0.0",
         "electron-log": "^5.4.4",
@@ -33,7 +32,6 @@
         "@electron-forge/maker-zip": "8.0.0-alpha.10",
         "@types/electron-prompt": "^1.6.5",
         "@types/ini": "^4.1.1",
-        "@types/ws": "^8.18.1",
         "copyfiles": "^2.4.1",
         "electron": "^44.0.0",
         "oxlint": "^1.80.0",
@@ -803,63 +801,6 @@
         "node": ">=18.0.0"
       }
     },
-    "node_modules/@jsep-plugin/assignment": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/@jsep-plugin/assignment/-/assignment-1.3.0.tgz",
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-      "license": "MIT",
-      "engines": {
-        "node": ">= 10.16.0"
-      },
-      "peerDependencies": {
-        "jsep": "^0.4.0||^1.0.0"
-      }
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-    "node_modules/@jsep-plugin/regex": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/@jsep-plugin/regex/-/regex-1.0.4.tgz",
-      "integrity": "sha512-q7qL4Mgjs1vByCaTnDFcBnV9HS7GVPJX5vyVoCgZHNSC9rjwIlmbXG5sUuorR5ndfHAIlJ8pVStxvjXHbNvtUg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 10.16.0"
-      },
-      "peerDependencies": {
-        "jsep": "^0.4.0||^1.0.0"
-      }
-    },
-    "node_modules/@kubernetes/client-node": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/@kubernetes/client-node/-/client-node-2.0.0.tgz",
-      "integrity": "sha512-Jx2cRxEVb4XkDNiR/cg8SX9dH6ZHdMhKmZdQcfhn2vdBWHdb2ldwM0P3I0dK4msYhFmC6TCODsNHH144IpA06w==",
-      "license": "Apache-2.0",
-      "dependencies": {
-        "@types/js-yaml": "^4.0.1",
-        "@types/node": "^26.0.0",
-        "@types/stream-buffers": "^3.0.3",
-        "form-data": "^4.0.0",
-        "hpagent": "^1.2.0",
-        "isomorphic-ws": "^5.0.0",
-        "js-yaml": "^5.1.0",
-        "jsonpath-plus": "^10.3.0",
-        "openid-client": "^6.1.3",
-        "rfc4648": "^1.3.0",
-        "socks": "^2.8.4",
-        "socks-proxy-agent": "^10.0.0",
-        "stream-buffers": "^3.0.2",
-        "tar-fs": "^3.0.9",
-        "undici": "^8.7.0",
-        "ws": "^8.18.2"
-      }
-    },
-    "node_modules/@kubernetes/client-node/node_modules/undici": {
-      "version": "8.10.0",
-      "resolved": "https://registry.npmjs.org/undici/-/undici-8.10.0.tgz",
-      "integrity": "sha512-HvltHd7avK13QIw/oLe4qoOLyoVSoafqJ2jYOrtMRBkbYT31eiBQ8O0ehRKZiEZCMEyLFQNIADpgCWC5fALvYQ==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=22.19.0"
-      }
-    },
     "node_modules/@malept/cross-spawn-promise": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/@malept/cross-spawn-promise/-/cross-spawn-promise-2.0.0.tgz",
@@ -1304,40 +1245,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/@types/js-yaml": {
-      "version": "4.0.9",
-      "resolved": "https://registry.npmjs.org/@types/js-yaml/-/js-yaml-4.0.9.tgz",
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-      "license": "MIT"
-    },
-    "node_modules/@types/node": {
-      "version": "26.4.0",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-26.4.0.tgz",
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-      "license": "MIT",
-      "dependencies": {
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-    "node_modules/@types/stream-buffers": {
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-      "license": "MIT",
-      "dependencies": {
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-      }
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-    "node_modules/@types/ws": {
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-      "resolved": "https://registry.npmjs.org/@types/ws/-/ws-8.18.1.tgz",
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-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
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@@ -1698,15 +1605,6 @@
         "node": "^20.17.0 || >=22.9.0"
       }
     },
-    "node_modules/agent-base": {
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-      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-9.0.0.tgz",
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-      "license": "MIT",
-      "engines": {
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     "node_modules/ajv": {
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       "license": "Python-2.0"
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-    "node_modules/asynckit": {
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-      "license": "MIT"
-    },
     "node_modules/atomically": {
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       "resolved": "https://registry.npmjs.org/atomically/-/atomically-2.1.1.tgz",
@@ -1817,20 +1709,6 @@
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-    "node_modules/b4a": {
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-      "resolved": "https://registry.npmjs.org/b4a/-/b4a-1.8.1.tgz",
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-      "license": "Apache-2.0",
-      "peerDependencies": {
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-      },
-      "peerDependenciesMeta": {
-        "react-native-b4a": {
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     "node_modules/balanced-match": {
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@@ -1841,86 +1719,6 @@
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-    "node_modules/bare-events": {
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-        "bare-path": "^3.0.0",
-        "bare-stream": "^2.6.4",
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@@ -1961,19 +1759,6 @@
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+      "dev": true,
       "license": "MIT",
       "dependencies": {
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@@ -2405,15 +2179,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
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@@ -2429,20 +2194,6 @@
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       "resolved": "https://registry.npmjs.org/rfdc/-/rfdc-1.4.1.tgz",
@@ -4088,64 +3527,6 @@
         "node": ">=8.0.0"
       }
     },
-    "node_modules/smart-buffer": {
-      "version": "4.2.0",
-      "resolved": "https://registry.npmjs.org/smart-buffer/-/smart-buffer-4.2.0.tgz",
-      "integrity": "sha512-94hK0Hh8rPqQl2xXc3HsaBoOXKV20MToPkcXvwbISWLEs+64sBq5kFgn2kJDHb1Pry9yrP0dxrCI9RRci7RXKg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 6.0.0",
-        "npm": ">= 3.0.0"
-      }
-    },
-    "node_modules/socks": {
-      "version": "2.8.9",
-      "resolved": "https://registry.npmjs.org/socks/-/socks-2.8.9.tgz",
-      "integrity": "sha512-LJhUYUvItdQ0LkJTmPeaEObWXAqFyfmP85x0tch/ez9cahmhlBBLbIqDFnvBnUJGagb0JbIQrkBs1wJ+yRYpEw==",
-      "license": "MIT",
-      "dependencies": {
-        "ip-address": "^10.1.1",
-        "smart-buffer": "^4.2.0"
-      },
-      "engines": {
-        "node": ">= 10.0.0",
-        "npm": ">= 3.0.0"
-      }
-    },
-    "node_modules/socks-proxy-agent": {
-      "version": "10.1.0",
-      "resolved": "https://registry.npmjs.org/socks-proxy-agent/-/socks-proxy-agent-10.1.0.tgz",
-      "integrity": "sha512-WlMj/67cEJ6MDI1OcsnjuYKDNDoyPCCYZ249kuuXPiMDw9F8PXkVaQ7YWu3siTydfQ/4BEZcvGzu+aYvz7dDCQ==",
-      "license": "MIT",
-      "dependencies": {
-        "agent-base": "9.0.0",
-        "debug": "^4.3.4",
-        "socks": "^2.8.3"
-      },
-      "engines": {
-        "node": ">= 20"
-      }
-    },
-    "node_modules/stream-buffers": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/stream-buffers/-/stream-buffers-3.0.3.tgz",
-      "integrity": "sha512-pqMqwQCso0PBJt2PQmDO0cFj0lyqmiwOMiMSkVtRokl7e+ZTRYgDHKnuZNbqjiJXgsg4nuqtD/zxuo9KqTp0Yw==",
-      "license": "Unlicense",
-      "engines": {
-        "node": ">= 0.10.0"
-      }
-    },
-    "node_modules/streamx": {
-      "version": "2.28.1",
-      "resolved": "https://registry.npmjs.org/streamx/-/streamx-2.28.1.tgz",
-      "integrity": "sha512-zEzXb0s5Cds7tqMH6rhZ05lcJydCWiQPEwiNngVqzsxCc962vLY4Uw+mW7od8kDH258k2Uz/JrOkdIAAhSh9VA==",
-      "license": "MIT",
-      "dependencies": {
-        "events-universal": "^1.0.0",
-        "fast-fifo": "^1.3.2",
-        "text-decoder": "^1.1.0"
-      }
-    },
     "node_modules/string_decoder": {
       "version": "0.10.31",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
@@ -4244,41 +3625,6 @@
         "node": ">=18"
       }
     },
-    "node_modules/tar-fs": {
-      "version": "3.1.3",
-      "resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-3.1.3.tgz",
-      "integrity": "sha512-/hU4AXnIdZu+Gvl1pk0oI5f5HxWsCJRtY2aFaJdk9VvyL48DWU6iU5WAIPG+wIi1YvWA6eTJvIviP/tMAZZNwQ==",
-      "license": "MIT",
-      "dependencies": {
-        "pump": "^3.0.0",
-        "tar-stream": "^3.1.5"
-      },
-      "optionalDependencies": {
-        "bare-fs": "^4.0.1",
-        "bare-path": "^3.0.0"
-      }
-    },
-    "node_modules/tar-stream": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-3.2.1.tgz",
-      "integrity": "sha512-nqsEO8zLZJvrOMdEwkA0QdCLFbetHMn95Zqu4fKwX+hkaTWJPZZOrxx/PwtxoK0MMGQmBQNRW3CPs8IFYQz4cQ==",
-      "license": "MIT",
-      "dependencies": {
-        "b4a": "^1.6.4",
-        "bare-fs": "^4.5.5",
-        "fast-fifo": "^1.2.0",
-        "streamx": "^2.15.0"
-      }
-    },
-    "node_modules/teex": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/teex/-/teex-1.0.1.tgz",
-      "integrity": "sha512-eYE6iEI62Ni1H8oIa7KlDU6uQBtqr4Eajni3wX7rpfXD8ysFx8z0+dri+KWEPWpBsxXfxu58x/0jvTVT1ekOSg==",
-      "license": "MIT",
-      "dependencies": {
-        "streamx": "^2.12.5"
-      }
-    },
     "node_modules/temp": {
       "version": "0.9.4",
       "resolved": "https://registry.npmjs.org/temp/-/temp-0.9.4.tgz",
@@ -4308,15 +3654,6 @@
         "mkdirp": "bin/cmd.js"
       }
     },
-    "node_modules/text-decoder": {
-      "version": "1.2.7",
-      "resolved": "https://registry.npmjs.org/text-decoder/-/text-decoder-1.2.7.tgz",
-      "integrity": "sha512-vlLytXkeP4xvEq2otHeJfSQIRyWxo/oZGEbXrtEEF9Hnmrdly59sUbzZ/QgyWuLYHctCHxFF4tRQZNQ9k60ExQ==",
-      "license": "Apache-2.0",
-      "dependencies": {
-        "b4a": "^1.6.4"
-      }
-    },
     "node_modules/through2": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
@@ -4457,12 +3794,6 @@
         "node": ">=20.18.1"
       }
     },
-    "node_modules/undici-types": {
-      "version": "8.3.0",
-      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.3.0.tgz",
-      "integrity": "sha512-j375ScV60dom+YkPFIfTLcOiPxkN/buHz5GobjLhixFuANaNs3C9l4GmrWqejgXWJ7BbJcFYpTEUkS1Ge8bpZQ==",
-      "license": "MIT"
-    },
     "node_modules/universalify": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
@@ -4570,29 +3901,9 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "dev": true,
       "license": "ISC"
     },
-    "node_modules/ws": {
-      "version": "8.21.3",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-8.21.3.tgz",
-      "integrity": "sha512-201TZ/kPWxoPr/OKWjquZR1SWKXcvxdH+e1xrx89b3YbmzLMFCLfnaG1HFIgWzJOEWZ7MvpK++odZufgYR50Rw==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=10.0.0"
-      },
-      "peerDependencies": {
-        "bufferutil": "^4.0.1",
-        "utf-8-validate": ">=5.0.2"
-      },
-      "peerDependenciesMeta": {
-        "bufferutil": {
-          "optional": true
-        },
-        "utf-8-validate": {
-          "optional": true
-        }
-      }
-    },
     "node_modules/xmlbuilder": {
       "version": "15.1.1",
       "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-15.1.1.tgz",
diff --git a/package.json b/package.json
index 578b28d..9bc1571 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,6 @@
     "@electron-forge/maker-zip": "8.0.0-alpha.10",
     "@types/electron-prompt": "^1.6.5",
     "@types/ini": "^4.1.1",
-    "@types/ws": "^8.18.1",
     "copyfiles": "^2.4.1",
     "electron": "^44.0.0",
     "oxlint": "^1.80.0",
@@ -39,7 +38,6 @@
     "@aws-sdk/client-sso": "^3.1121.0",
     "@aws-sdk/client-sso-oidc": "^3.1121.0",
     "@aws-sdk/credential-providers": "^3.1121.0",
-    "@kubernetes/client-node": "^2.0.0",
     "atomically": "^2.1.1",
     "delay": "^7.0.0",
     "electron-log": "^5.4.4",
diff --git a/src/kubeconfig.ts b/src/kubeconfig.ts
index cdae6b0..573e8ea 100644
--- a/src/kubeconfig.ts
+++ b/src/kubeconfig.ts
@@ -5,7 +5,6 @@ import { existsSync } from "fs";
 import { writeFilePreservingMode } from "./atomic-write.js";
 import log from "electron-log/main";
 import { ClusterInfo } from "./aws-eks.js";
-import { KubeConfig } from "@kubernetes/client-node";
 import * as yaml from "js-yaml";
 
 const AWS_IAM_AUTHENTICATOR_BASENAME =
@@ -49,79 +48,172 @@ const AWS_IAM_AUTHENTICATOR = findAwsIamAuthenticator();
 
 type NamePattern = (info: ClusterInfo) => string;
 
-async function readExistingConfig(): Promise<{
-    path: string;
-    currentKubeconfig: KubeConfig;
-}> {
-    const path = join(homedir(), ".kube", "config");
-    log.info("[readExistingConfig] Reading %s", path);
-    const currentKubeconfig = new KubeConfig();
+/** The per-entry key that holds the body, one per kubeconfig list. */
+type Section = "cluster" | "user" | "context";
+
+/** One entry of `clusters`, `users` or `contexts`. */
+interface NamedEntry {
+    name?: unknown;
+    [key: string]: unknown;
+}
+
+/**
+ * A kubeconfig as it is on disk. Only the three lists are spelled out because
+ * they are the only thing Frost writes; `current-context`, `preferences`,
+ * per-entry `extensions` and whatever kubectl grows next ride along in the
+ * index signature and are written back untouched.
+ */
+interface KubeconfigDocument {
+    clusters?: NamedEntry[];
+    users?: NamedEntry[];
+    contexts?: NamedEntry[];
+    [key: string]: unknown;
+}
+
+function kubeconfigPath(): string {
+    return join(homedir(), ".kube", "config");
+}
+
+async function readKubeconfigFile(fullPath: string): Promise<string> {
     try {
-        const contents = await readFile(path);
-        currentKubeconfig.loadFromString(contents.toString());
+        return (await readFile(fullPath)).toString();
     } catch (err) {
         log.debug(
-            "[readExistingConfig] While trying to read %s: %s",
-            path,
+            "[readKubeconfigFile] While trying to read %s: %s",
+            fullPath,
             err
         );
+        return "";
     }
-    return { path, currentKubeconfig };
 }
 
 export async function writeKubeconfig(clusters: ClusterInfo[]) {
-    const { path, currentKubeconfig } = await readExistingConfig();
-    log.info("[writeKubeconfig] Writing %s", path);
+    const fullPath = kubeconfigPath();
+    const existing = await readKubeconfigFile(fullPath);
 
-    const namePattern = getNamePattern(clusters);
-
-    const kubeconfig = clusters
-        .map((cluster) => toKubeconfig(cluster, namePattern))
-        .reduce(mergeKubeConfigs, currentKubeconfig);
+    let contents: string;
+    try {
+        contents = mergeKubeconfig(existing, clusters);
+    } catch (err) {
+        // Most of this file is the user's - their own clusters, their
+        // current-context. One we cannot parse is one we cannot merge into,
+        // and writing our entries on their own would throw the rest away.
+        log.error(
+            "[writeKubeconfig] Leaving %s alone, cannot parse it: %s",
+            fullPath,
+            err
+        );
+        return;
+    }
 
-    const exported = JSON.parse(kubeconfig.exportConfig());
-    const contents = yaml.dump(exported);
+    if (contents === existing) {
+        log.info("[writeKubeconfig] %s is up to date", fullPath);
+        return;
+    }
 
+    log.info("[writeKubeconfig] Writing %s", fullPath);
     // Holds the user's own clusters as well as ours, so an interrupted run
     // must not truncate it and their permissions are theirs to keep.
-    await writeFilePreservingMode(path, contents);
+    await writeFilePreservingMode(fullPath, contents);
 }
 
-function mergeKubeConfigs(
-    existing: KubeConfig,
-    update: KubeConfig
-): KubeConfig {
-    if (!existing.clusters) {
-        existing.clusters = [];
+/**
+ * Merges the discovered clusters into an existing kubeconfig.
+ *
+ * The parsed document is edited in place rather than rebuilt from a model of a
+ * kubeconfig. A model only carries the fields it knows about, so a round trip
+ * through one drops the rest - `preferences`, `extensions`, impersonation keys
+ * - and a single entry it refuses to parse costs the user every context and
+ * user in the file. `kubectl config set-context x --namespace=y` writes such
+ * an entry: a context with no cluster.
+ *
+ * Pure and importable, so it can be exercised without an Electron app.
+ */
+export function mergeKubeconfig(
+    existing: string,
+    infos: ClusterInfo[]
+): string {
+    const document = parseKubeconfig(existing);
+    const getName = getNamePattern(infos);
+
+    for (const info of infos) {
+        const name = getName(info);
+
+        document.clusters = upsert(document.clusters, name, "cluster", {
+            server: info.cluster.endpoint!,
+            "certificate-authority-data":
+                info.cluster.certificateAuthority!.data!,
+        });
+
+        document.users = upsert(document.users, name, "user", {
+            exec: {
+                apiVersion: "client.authentication.k8s.io/v1",
+                command: AWS_IAM_AUTHENTICATOR,
+                args: ["token", "-i", info.cluster.name!],
+                env: [{ name: "AWS_PROFILE", value: info.profile.name }],
+                interactiveMode: "Never",
+            },
+        });
+
+        document.contexts = upsert(document.contexts, name, "context", {
+            cluster: name,
+            user: name,
+        });
     }
-    update.clusters.forEach((newCluster) => {
-        existing.clusters = existing.clusters.filter(
-            (existingCluster) => existingCluster.name !== newCluster.name
-        );
-        existing.clusters.push(newCluster);
-    });
 
-    if (!existing.users) {
-        existing.users = [];
+    // Every value on one line. Folding a base64 certificate or an application
+    // path across lines is legal YAML and kubectl reads it back, but it leaves
+    // a file unlike what `aws eks update-kubeconfig` writes and unreadable in
+    // a diff.
+    return yaml.dump(document, { lineWidth: -1 });
+}
+
+function parseKubeconfig(existing: string): KubeconfigDocument {
+    if (existing.trim() === "") {
+        return { apiVersion: "v1", kind: "Config", preferences: {} };
     }
-    update.users.forEach((newUser) => {
-        existing.users = existing.users.filter(
-            (existingUser) => existingUser.name !== newUser.name
-        );
-        existing.users.push(newUser);
-    });
 
-    if (!existing.contexts) {
-        existing.contexts = [];
+    const document = yaml.load(existing);
+    if (
+        typeof document !== "object" ||
+        document === null ||
+        Array.isArray(document)
+    ) {
+        throw new Error("kubeconfig is not a YAML mapping");
     }
-    update.contexts.forEach((newContext) => {
-        existing.contexts = existing.contexts.filter(
-            (existingContext) => existingContext.name !== newContext.name
-        );
-        existing.contexts.push(newContext);
-    });
+    return document as KubeconfigDocument;
+}
 
-    return existing;
+/**
+ * Writes one `{ name, <section>: {...} }` entry, replacing the same-named one
+ * if it is already there.
+ *
+ * That replacement merges, and keeps the entry where it was: Frost owns the
+ * keys it writes and nothing else, so a namespace the user set on one of these
+ * contexts, or a `proxy-url` on the cluster, survives the next refresh.
+ */
+function upsert(
+    entries: NamedEntry[] | undefined,
+    name: string,
+    section: Section,
+    body: Record<string, unknown>
+): NamedEntry[] {
+    const list = Array.isArray(entries) ? entries : [];
+    const index = list.findIndex((entry) => entry?.name === name);
+
+    if (index < 0) {
+        return [...list, { name, [section]: body }];
+    }
+
+    const previous = list[index][section];
+    const merged =
+        typeof previous === "object" && previous !== null
+            ? { ...previous, ...body }
+            : body;
+
+    return list.map((entry, at) =>
+        at === index ? { ...entry, name, [section]: merged } : entry
+    );
 }
 
 function getNamePattern(infos: ClusterInfo[]): NamePattern {
@@ -133,7 +225,12 @@ function getNamePattern(infos: ClusterInfo[]): NamePattern {
     const roleNames = infos.map((info) => info.profile.roleName);
     const regionNames = infos.map((info) => info.region.RegionName);
 
-    const uniqueClusters = clusterNames.length === clusterIds.length;
+    // Whether the bare name tells two *different* clusters apart. One cluster
+    // reached through several profiles is one id and one name; two clusters
+    // that happen to share a name are two ids and one name, and every pattern
+    // below would then hand them the same entry and lose one of them.
+    const uniqueClusters =
+        new Set(clusterNames).size === new Set(clusterIds).size;
     const sameRoleName = new Set(roleNames).size === 1;
     const sameRegion = new Set(regionNames).size === 1;
 
@@ -156,39 +253,3 @@ function getNamePattern(infos: ClusterInfo[]): NamePattern {
     return (info: ClusterInfo) =>
         `${info.cluster.name}:${info.profile.accountName}:${info.region.RegionName}:${info.profile.roleName}`;
 }
-
-function toKubeconfig(info: ClusterInfo, getName: NamePattern): KubeConfig {
-    const kubeconfig = new KubeConfig();
-    const name = getName(info);
-
-    kubeconfig.addCluster({
-        name,
-        server: info.cluster.endpoint!,
-        caData: info.cluster.certificateAuthority!.data!,
-        skipTLSVerify: false,
-    });
-
-    kubeconfig.addUser({
-        name,
-        exec: {
-            apiVersion: "client.authentication.k8s.io/v1",
-            command: AWS_IAM_AUTHENTICATOR,
-            args: ["token", "-i", info.cluster.name],
-            env: [
-                {
-                    name: "AWS_PROFILE",
-                    value: info.profile.name,
-                },
-            ],
-            interactiveMode: "Never",
-        },
-    });
-
-    kubeconfig.addContext({
-        name,
-        user: name,
-        cluster: name,
-    });
-
-    return kubeconfig;
-}