From 6ca85c61927f9b0c78d668d74f95030fed6cd882 Mon Sep 17 00:00:00 2001
From: jfilipiuk <jakub.filipiuk@huawei.com>
Date: Tue, 16 Jun 2026 01:08:34 +0200
Subject: [PATCH] feat: render mermaid fences as diagrams with click-to-zoom
 (#7)

* feat: render mermaid fences as diagrams in chat markdown

* feat: add zoom for mermaid diagrams - opened in native size in separate window
---
 package-lock.json                      | 1292 ++++++++++++++++++++++++
 package.json                           |    3 +
 src/app/components/ChatInterface.tsx   |    4 +
 src/app/components/ChatMessage.tsx     |    8 +-
 src/app/components/CodeBlock.tsx       |   66 ++
 src/app/components/MarkdownContent.tsx |  107 +-
 src/app/components/MermaidDiagram.tsx  |  131 +++
 7 files changed, 1539 insertions(+), 72 deletions(-)
 create mode 100644 src/app/components/CodeBlock.tsx
 create mode 100644 src/app/components/MermaidDiagram.tsx

diff --git a/package-lock.json b/package-lock.json
index 4d5dee6..d1883aa 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -21,6 +21,7 @@
         "class-variance-authority": "^0.7.1",
         "clsx": "^1.2.1",
         "lucide-react": "^0.539.0",
+        "mermaid": "^11.15.0",
         "next": "^16.2.5",
         "nuqs": "^2.8.8",
         "react": "19.1.0",
@@ -28,6 +29,8 @@
         "react-markdown": "^9.0.1",
         "react-resizable-panels": "^3.0.6",
         "react-syntax-highlighter": "^15.6.1",
+        "rehype-raw": "^7.0.0",
+        "rehype-sanitize": "^6.0.0",
         "remark-gfm": "^4.0.0",
         "sonner": "^2.0.7",
         "swr": "^2.4.1",
@@ -75,6 +78,19 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/@antfu/install-pkg": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@antfu/install-pkg/-/install-pkg-1.1.0.tgz",
+      "integrity": "sha512-MGQsmw10ZyI+EJo45CdSER4zEb+p31LpDAFp2Z3gkSd1yqVZGi0Ebx++YTEMonJy4oChEMLsxZ64j8FH6sSqtQ==",
+      "license": "MIT",
+      "dependencies": {
+        "package-manager-detector": "^1.3.0",
+        "tinyexec": "^1.0.1"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
+      }
+    },
     "node_modules/@babel/code-frame": {
       "version": "7.29.7",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.7.tgz",
@@ -337,12 +353,24 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@braintree/sanitize-url": {
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/@braintree/sanitize-url/-/sanitize-url-7.1.2.tgz",
+      "integrity": "sha512-jigsZK+sMF/cuiB7sERuo9V7N9jx+dhmHHnQyDSVdpZwVutaBu7WvNYqMDLSgFgfB30n452TP3vjDAvFC973mA==",
+      "license": "MIT"
+    },
     "node_modules/@cfworker/json-schema": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/@cfworker/json-schema/-/json-schema-4.1.1.tgz",
       "integrity": "sha512-gAmrUZSGtKc3AiBL71iNWxDsyUC5uMaKKGdvzYsBoTW/xi42JQHl7eKV2OYzCUqvc+D2RCcf7EXY2iCyFIk6og==",
       "license": "MIT"
     },
+    "node_modules/@chevrotain/types": {
+      "version": "11.1.2",
+      "resolved": "https://registry.npmjs.org/@chevrotain/types/-/types-11.1.2.tgz",
+      "integrity": "sha512-U+HFai5+zmJCkK86QsaJtoITlboZHBqrVketcO2ROv865xfCMSFpELQoz1GkX5GzME8pTa+3kbKrZHQtI0gdbw==",
+      "license": "Apache-2.0"
+    },
     "node_modules/@emnapi/core": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.10.0.tgz",
@@ -624,6 +652,23 @@
         "url": "https://github.com/sponsors/nzakas"
       }
     },
+    "node_modules/@iconify/types": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@iconify/types/-/types-2.0.0.tgz",
+      "integrity": "sha512-+wluvCrRhXrhyOmRDJ3q8mux9JkKy5SJ/v8ol2tu4FVjyYvtEzkc/3pK15ET6RKg4b4w4BmTk1+gsCUhf21Ykg==",
+      "license": "MIT"
+    },
+    "node_modules/@iconify/utils": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/@iconify/utils/-/utils-3.1.3.tgz",
+      "integrity": "sha512-LPKOXPn/zV+zis1oOfGWogaXVpqUybF3ZS6SCZIsz8vg0ivVp9+fVqyYB7xq0aiST/VhUQYGO1qo6uoYSiEJqw==",
+      "license": "MIT",
+      "dependencies": {
+        "@antfu/install-pkg": "^1.1.0",
+        "@iconify/types": "^2.0.0",
+        "import-meta-resolve": "^4.2.0"
+      }
+    },
     "node_modules/@img/colour": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@img/colour/-/colour-1.1.0.tgz",
@@ -1262,6 +1307,15 @@
         }
       }
     },
+    "node_modules/@mermaid-js/parser": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@mermaid-js/parser/-/parser-1.1.1.tgz",
+      "integrity": "sha512-VuHdsYMK1bT6X2JbcAaWAhugTRvRBRyuZgd+c22swUeI9g/ntaxF7CY7dYarhZovofCbUNO0G7JesfmNtjYOCw==",
+      "license": "MIT",
+      "dependencies": {
+        "@chevrotain/types": "~11.1.1"
+      }
+    },
     "node_modules/@napi-rs/wasm-runtime": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-1.1.4.tgz",
@@ -2243,6 +2297,259 @@
         "tslib": "^2.4.0"
       }
     },
+    "node_modules/@types/d3": {
+      "version": "7.4.3",
+      "resolved": "https://registry.npmjs.org/@types/d3/-/d3-7.4.3.tgz",
+      "integrity": "sha512-lZXZ9ckh5R8uiFVt8ogUNf+pIrK4EsWrx2Np75WvF/eTpJ0FMHNhjXk8CKEx/+gpHbNQyJWehbFaTvqmHWB3ww==",
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+      "dependencies": {
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+        "@types/d3-axis": "*",
+        "@types/d3-brush": "*",
+        "@types/d3-chord": "*",
+        "@types/d3-color": "*",
+        "@types/d3-contour": "*",
+        "@types/d3-delaunay": "*",
+        "@types/d3-dispatch": "*",
+        "@types/d3-drag": "*",
+        "@types/d3-dsv": "*",
+        "@types/d3-ease": "*",
+        "@types/d3-fetch": "*",
+        "@types/d3-force": "*",
+        "@types/d3-format": "*",
+        "@types/d3-geo": "*",
+        "@types/d3-hierarchy": "*",
+        "@types/d3-interpolate": "*",
+        "@types/d3-path": "*",
+        "@types/d3-polygon": "*",
+        "@types/d3-quadtree": "*",
+        "@types/d3-random": "*",
+        "@types/d3-scale": "*",
+        "@types/d3-scale-chromatic": "*",
+        "@types/d3-selection": "*",
+        "@types/d3-shape": "*",
+        "@types/d3-time": "*",
+        "@types/d3-time-format": "*",
+        "@types/d3-timer": "*",
+        "@types/d3-transition": "*",
+        "@types/d3-zoom": "*"
+      }
+    },
+    "node_modules/@types/d3-array": {
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/@types/d3-array/-/d3-array-3.2.2.tgz",
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+    "node_modules/@types/d3-axis": {
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+      "version": "8.3.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-8.3.0.tgz",
+      "integrity": "sha512-OkTL9umf+He2DZkUq8f8J9of7yL6RJKI24dVITBmNfZBmri9zYZQrKkuXiKhyfPSu8tUhnVBB1iKXevvnlR4Ww==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 12"
+      }
+    },
     "node_modules/keyv": {
       "version": "4.5.4",
       "resolved": "https://registry.npmjs.org/keyv/-/keyv-4.5.4.tgz",
@@ -6031,6 +7105,11 @@
         "json-buffer": "3.0.1"
       }
     },
+    "node_modules/khroma": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/khroma/-/khroma-2.1.0.tgz",
+      "integrity": "sha512-Ls993zuzfayK269Svk9hzpeGUKob/sIgZzyHYdjQoAdQetRKpOLj+k/QQQ/6Qi0Yz65mlROrfd+Ev+1+7dz9Kw=="
+    },
     "node_modules/langsmith": {
       "version": "0.7.3",
       "resolved": "https://registry.npmjs.org/langsmith/-/langsmith-0.7.3.tgz",
@@ -6084,6 +7163,12 @@
         "node": ">=0.10"
       }
     },
+    "node_modules/layout-base": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/layout-base/-/layout-base-1.0.2.tgz",
+      "integrity": "sha512-8h2oVEZNktL4BH2JCOI90iD1yXwL6iNW7KcCKT2QZgQJR2vbqDsldCTPRU9NifTCqHZci57XvQQ15YTu+sTYPg==",
+      "license": "MIT"
+    },
     "node_modules/levn": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/levn/-/levn-0.4.1.tgz",
@@ -6134,6 +7219,12 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/lodash-es": {
+      "version": "4.18.1",
+      "resolved": "https://registry.npmjs.org/lodash-es/-/lodash-es-4.18.1.tgz",
+      "integrity": "sha512-J8xewKD/Gk22OZbhpOVSwcs60zhd95ESDwezOFuA3/099925PdHJ7OFHNTGtajL3AlZkykD32HykiMo+BIBI8A==",
+      "license": "MIT"
+    },
     "node_modules/lodash.merge": {
       "version": "4.6.2",
       "resolved": "https://registry.npmjs.org/lodash.merge/-/lodash.merge-4.6.2.tgz",
@@ -6207,6 +7298,18 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/marked": {
+      "version": "16.4.2",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-16.4.2.tgz",
+      "integrity": "sha512-TI3V8YYWvkVf3KJe1dRkpnjs68JUPyEa5vjKrp1XEEJUAOaQc+Qj+L1qWbPd0SJuAdQkFU0h73sXXqwDYxsiDA==",
+      "license": "MIT",
+      "bin": {
+        "marked": "bin/marked.js"
+      },
+      "engines": {
+        "node": ">= 20"
+      }
+    },
     "node_modules/math-intrinsics": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/math-intrinsics/-/math-intrinsics-1.1.0.tgz",
@@ -6509,6 +7612,48 @@
         "node": ">= 8"
       }
     },
+    "node_modules/mermaid": {
+      "version": "11.15.0",
+      "resolved": "https://registry.npmjs.org/mermaid/-/mermaid-11.15.0.tgz",
+      "integrity": "sha512-pTMbcf3rWdtLiYGpmoTjHEpeY8seiy6sR+9nD7LOs8KfUbHE4lOUAprTRqRAcWSQ6MQpdX+YEsxShtGsINtPtw==",
+      "license": "MIT",
+      "dependencies": {
+        "@braintree/sanitize-url": "^7.1.1",
+        "@iconify/utils": "^3.0.2",
+        "@mermaid-js/parser": "^1.1.1",
+        "@types/d3": "^7.4.3",
+        "@upsetjs/venn.js": "^2.0.0",
+        "cytoscape": "^3.33.1",
+        "cytoscape-cose-bilkent": "^4.1.0",
+        "cytoscape-fcose": "^2.2.0",
+        "d3": "^7.9.0",
+        "d3-sankey": "^0.12.3",
+        "dagre-d3-es": "7.0.14",
+        "dayjs": "^1.11.19",
+        "dompurify": "^3.3.1",
+        "es-toolkit": "^1.45.1",
+        "katex": "^0.16.25",
+        "khroma": "^2.1.0",
+        "marked": "^16.3.0",
+        "roughjs": "^4.6.6",
+        "stylis": "^4.3.6",
+        "ts-dedent": "^2.2.0",
+        "uuid": "^11.1.0 || ^12 || ^13 || ^14.0.0"
+      }
+    },
+    "node_modules/mermaid/node_modules/uuid": {
+      "version": "14.0.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-14.0.0.tgz",
+      "integrity": "sha512-Qo+uWgilfSmAhXCMav1uYFynlQO7fMFiMVZsQqZRMIXp0O7rR7qjkj+cPvBHLgBqi960QCoo/PH2/6ZtVqKvrg==",
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist-node/bin/uuid"
+      }
+    },
     "node_modules/micromark": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/micromark/-/micromark-4.0.2.tgz",
@@ -7601,6 +8746,12 @@
         "node": ">=8"
       }
     },
+    "node_modules/package-manager-detector": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/package-manager-detector/-/package-manager-detector-1.6.0.tgz",
+      "integrity": "sha512-61A5ThoTiDG/C8s8UMZwSorAGwMJ0ERVGj2OjoW5pAalsNOg15+iQiPzrLJ4jhZ1HJzmC2PIHT2oEiH3R5fzNA==",
+      "license": "MIT"
+    },
     "node_modules/parent-module": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/parent-module/-/parent-module-1.0.1.tgz",
@@ -7639,6 +8790,24 @@
       "integrity": "sha512-CmBKiL6NNo/OqgmMn95Fk9Whlp2mtvIv+KNpQKN2F4SjvrEesubTRWGYSg+BnWZOnlCaSTU1sMpsBOzgbYhnsA==",
       "license": "MIT"
     },
+    "node_modules/parse5": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-7.3.0.tgz",
+      "integrity": "sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw==",
+      "license": "MIT",
+      "dependencies": {
+        "entities": "^6.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
+    "node_modules/path-data-parser": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/path-data-parser/-/path-data-parser-0.1.0.tgz",
+      "integrity": "sha512-NOnmBpt5Y2RWbuv0LMzsayp3lVylAHLPUTut412ZA3l+C4uw4ZVkQbjShYCQ8TCpUMdPapr4YjUqLYD6v68j+w==",
+      "license": "MIT"
+    },
     "node_modules/path-exists": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-4.0.0.tgz",
@@ -7705,6 +8874,22 @@
         "node": ">= 6"
       }
     },
+    "node_modules/points-on-curve": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/points-on-curve/-/points-on-curve-0.2.0.tgz",
+      "integrity": "sha512-0mYKnYYe9ZcqMCWhUjItv/oHjvgEsfKvnUTg8sAtnHr3GVy7rGkXCb6d5cSyqrWqL4k81b9CPg3urd+T7aop3A==",
+      "license": "MIT"
+    },
+    "node_modules/points-on-path": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/points-on-path/-/points-on-path-0.2.1.tgz",
+      "integrity": "sha512-25ClnWWuw7JbWZcgqY/gJ4FQWadKxGWk+3kR/7kD0tCaDtPPMj7oHu2ToLaVhfpnHrZzYby2w6tUA0eOIuUg8g==",
+      "license": "MIT",
+      "dependencies": {
+        "path-data-parser": "0.1.0",
+        "points-on-curve": "0.2.0"
+      }
+    },
     "node_modules/possible-typed-array-names": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/possible-typed-array-names/-/possible-typed-array-names-1.1.0.tgz",
@@ -8411,6 +9596,35 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/rehype-raw": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/rehype-raw/-/rehype-raw-7.0.0.tgz",
+      "integrity": "sha512-/aE8hCfKlQeA8LmyeyQvQF3eBiLRGNlfBJEvWH7ivp9sBqs7TNqBL5X3v157rM4IFETqDnIOO+z5M/biZbo9Ww==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/hast": "^3.0.0",
+        "hast-util-raw": "^9.0.0",
+        "vfile": "^6.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/rehype-sanitize": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/rehype-sanitize/-/rehype-sanitize-6.0.0.tgz",
+      "integrity": "sha512-CsnhKNsyI8Tub6L4sm5ZFsme4puGfc6pYylvXo1AeqaGbjOYyzNv3qZPwvs0oMJ39eryyeOdmxwUIo94IpEhqg==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/hast": "^3.0.0",
+        "hast-util-sanitize": "^5.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
     "node_modules/remark-gfm": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/remark-gfm/-/remark-gfm-4.0.1.tgz",
@@ -8541,6 +9755,24 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/robust-predicates": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/robust-predicates/-/robust-predicates-3.0.3.tgz",
+      "integrity": "sha512-NS3levdsRIUOmiJ8FZWCP7LG3QpJyrs/TE0Zpf1yvZu8cAJJ6QMW92H1c7kWpdIHo8RvmLxN/o2JXTKHp74lUA==",
+      "license": "Unlicense"
+    },
+    "node_modules/roughjs": {
+      "version": "4.6.6",
+      "resolved": "https://registry.npmjs.org/roughjs/-/roughjs-4.6.6.tgz",
+      "integrity": "sha512-ZUz/69+SYpFN/g/lUlo2FXcIjRkSu3nDarreVdGGndHEBJ6cXPdKguS8JGxwj5HA5xIbVKSmLgr5b3AWxtRfvQ==",
+      "license": "MIT",
+      "dependencies": {
+        "hachure-fill": "^0.5.2",
+        "path-data-parser": "^0.1.0",
+        "points-on-curve": "^0.2.0",
+        "points-on-path": "^0.2.1"
+      }
+    },
     "node_modules/run-parallel": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/run-parallel/-/run-parallel-1.2.0.tgz",
@@ -8565,6 +9797,12 @@
         "queue-microtask": "^1.2.2"
       }
     },
+    "node_modules/rw": {
+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/rw/-/rw-1.3.3.tgz",
+      "integrity": "sha512-PdhdWy89SiZogBLaw42zdeqtRJ//zFd2PgQavcICDUgJT5oW10QCRKbJ6bg4r0/UY2M6BWd5tkxuGFRvCkgfHQ==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/safe-array-concat": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/safe-array-concat/-/safe-array-concat-1.1.4.tgz",
@@ -8620,6 +9858,12 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
+      "license": "MIT"
+    },
     "node_modules/scheduler": {
       "version": "0.26.0",
       "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.26.0.tgz",
@@ -9083,6 +10327,12 @@
         }
       }
     },
+    "node_modules/stylis": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/stylis/-/stylis-4.4.0.tgz",
+      "integrity": "sha512-5Z9ZpRzfuH6l/UAvCPAPUo3665Nk2wLaZU3x+TLHKVzIz33+sbJqbtrYoC3KD4/uVOr2Zp+L0LySezP9OHV9yA==",
+      "license": "MIT"
+    },
     "node_modules/sucrase": {
       "version": "3.35.1",
       "resolved": "https://registry.npmjs.org/sucrase/-/sucrase-3.35.1.tgz",
@@ -9292,6 +10542,15 @@
         "node": ">=0.8"
       }
     },
+    "node_modules/tinyexec": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.2.4.tgz",
+      "integrity": "sha512-SHf/r48b7vOrjve9PxJo3MN5v5yuyjHvdUcrQffT3WXMUfnGmHDVbC4k3sHJaJTgZCwpUplIaAo5ANtMyp3YHg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/tinyglobby": {
       "version": "0.2.17",
       "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.17.tgz",
@@ -9386,6 +10645,15 @@
         "typescript": ">=4.8.4"
       }
     },
+    "node_modules/ts-dedent": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/ts-dedent/-/ts-dedent-2.2.0.tgz",
+      "integrity": "sha512-q5W7tVM71e2xjHZTlgfTDoPF/SmqKG5hddq9SzR49CH2hayqRKJtQ4mtRlSxKaJlR/+9rEM+mnBHf7I2/BQcpQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.10"
+      }
+    },
     "node_modules/ts-interface-checker": {
       "version": "0.1.13",
       "resolved": "https://registry.npmjs.org/ts-interface-checker/-/ts-interface-checker-0.1.13.tgz",
@@ -9829,6 +11097,20 @@
         "url": "https://opencollective.com/unified"
       }
     },
+    "node_modules/vfile-location": {
+      "version": "5.0.3",
+      "resolved": "https://registry.npmjs.org/vfile-location/-/vfile-location-5.0.3.tgz",
+      "integrity": "sha512-5yXvWDEgqeiYiBe1lbxYF7UMAIm/IcopxMHrMQDq3nvKcjPKIhZklUKL+AE7J7uApI4kwe2snsK+eI6UTj9EHg==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "^3.0.0",
+        "vfile": "^6.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
     "node_modules/vfile-message": {
       "version": "4.0.3",
       "resolved": "https://registry.npmjs.org/vfile-message/-/vfile-message-4.0.3.tgz",
@@ -9843,6 +11125,16 @@
         "url": "https://opencollective.com/unified"
       }
     },
+    "node_modules/web-namespaces": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/web-namespaces/-/web-namespaces-2.0.1.tgz",
+      "integrity": "sha512-bKr1DkiNa2krS7qxNtdrtHAmzuYGFQLiQ13TsorsdT6ULTkPLKuu5+GsFpDlg6JFjUTwX2DyhMPG2be8uPrqsQ==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
diff --git a/package.json b/package.json
index 2dcc975..dafb97f 100644
--- a/package.json
+++ b/package.json
@@ -60,6 +60,7 @@
     "class-variance-authority": "^0.7.1",
     "clsx": "^1.2.1",
     "lucide-react": "^0.539.0",
+    "mermaid": "^11.15.0",
     "next": "^16.2.5",
     "nuqs": "^2.8.8",
     "react": "19.1.0",
@@ -67,6 +68,8 @@
     "react-markdown": "^9.0.1",
     "react-resizable-panels": "^3.0.6",
     "react-syntax-highlighter": "^15.6.1",
+    "rehype-raw": "^7.0.0",
+    "rehype-sanitize": "^6.0.0",
     "remark-gfm": "^4.0.0",
     "sonner": "^2.0.7",
     "swr": "^2.4.1",
diff --git a/src/app/components/ChatInterface.tsx b/src/app/components/ChatInterface.tsx
index ab52759..15e21a6 100644
--- a/src/app/components/ChatInterface.tsx
+++ b/src/app/components/ChatInterface.tsx
@@ -942,6 +942,7 @@ export const ChatInterface = React.memo<ChatInterfaceProps>(
                     (u: any) => u.metadata?.message_id === data.message.id
                   );
                   const isLastMessage = index === processedMessages.length - 1;
+                  const isAssistant = data.message.type !== "human";
                   const showCompactionBefore =
                     compactionAnchorId === data.message.id;
                   return (
@@ -956,6 +957,9 @@ export const ChatInterface = React.memo<ChatInterfaceProps>(
                         message={data.message}
                         toolCalls={data.toolCalls}
                         isLoading={isLoading}
+                        isStreaming={
+                          isLoading && isLastMessage && isAssistant
+                        }
                         actionRequests={
                           isLastMessage ? actionRequests : undefined
                         }
diff --git a/src/app/components/ChatMessage.tsx b/src/app/components/ChatMessage.tsx
index 8ff6003..6c0045f 100644
--- a/src/app/components/ChatMessage.tsx
+++ b/src/app/components/ChatMessage.tsx
@@ -33,6 +33,8 @@ interface ChatMessageProps {
   message: Message;
   toolCalls: ToolCall[];
   isLoading?: boolean;
+  /** True only for the message currently being streamed (last assistant turn). */
+  isStreaming?: boolean;
   /** Pending tool-approval requests for this turn, in interrupt order. */
   actionRequests?: ActionRequest[];
   submittedActionRequestKeys?: Set<string>;
@@ -53,6 +55,7 @@ export const ChatMessage = React.memo<ChatMessageProps>(
     message,
     toolCalls,
     isLoading,
+    isStreaming,
     actionRequests,
     submittedActionRequestKeys,
     onActionRequestSubmitted,
@@ -295,7 +298,10 @@ export const ChatMessage = React.memo<ChatMessageProps>(
                     {messageContent}
                   </p>
                 ) : hasContent ? (
-                  <MarkdownContent content={messageContent} />
+                  <MarkdownContent
+                    content={messageContent}
+                    isStreaming={isStreaming}
+                  />
                 ) : null}
               </div>
             </div>
diff --git a/src/app/components/CodeBlock.tsx b/src/app/components/CodeBlock.tsx
new file mode 100644
index 0000000..20a4fa6
--- /dev/null
+++ b/src/app/components/CodeBlock.tsx
@@ -0,0 +1,66 @@
+"use client";
+
+import React, { useCallback, useState } from "react";
+import { Prism as SyntaxHighlighter } from "react-syntax-highlighter";
+import { oneDark } from "react-syntax-highlighter/dist/esm/styles/prism";
+import { Check, Copy } from "lucide-react";
+import { toast } from "sonner";
+import { copyText } from "@/lib/clipboard";
+
+interface CodeBlockProps {
+  language: string;
+  value: string;
+}
+
+export const CodeBlock = React.memo<CodeBlockProps>(({ language, value }) => {
+  const [copied, setCopied] = useState(false);
+  const handleCopy = useCallback(async () => {
+    if (await copyText(value)) {
+      setCopied(true);
+      setTimeout(() => setCopied(false), 2000);
+    } else {
+      toast.error("Couldn't copy to clipboard.");
+    }
+  }, [value]);
+
+  return (
+    <div className="group relative max-w-full">
+      <button
+        type="button"
+        onClick={handleCopy}
+        aria-label={copied ? "Copied" : "Copy code"}
+        className="absolute right-2 top-2 z-10 rounded-md border border-border bg-surface/80 p-1.5 text-[var(--color-text-tertiary)] opacity-0 backdrop-blur-sm transition-opacity hover:text-[var(--color-text-primary)] focus-visible:opacity-100 group-hover:opacity-100"
+      >
+        {copied ? (
+          <Check className="h-3.5 w-3.5" />
+        ) : (
+          <Copy className="h-3.5 w-3.5" />
+        )}
+      </button>
+      <SyntaxHighlighter
+        style={oneDark}
+        language={language}
+        PreTag="div"
+        className="max-w-full rounded-md text-sm"
+        wrapLines={true}
+        wrapLongLines={true}
+        lineProps={{
+          style: {
+            wordBreak: "break-all",
+            whiteSpace: "pre-wrap",
+            overflowWrap: "break-word",
+          },
+        }}
+        customStyle={{
+          margin: 0,
+          maxWidth: "100%",
+          overflowX: "auto",
+          fontSize: "0.875rem",
+        }}
+      >
+        {value}
+      </SyntaxHighlighter>
+    </div>
+  );
+});
+CodeBlock.displayName = "CodeBlock";
diff --git a/src/app/components/MarkdownContent.tsx b/src/app/components/MarkdownContent.tsx
index 5486c7b..00f1abb 100644
--- a/src/app/components/MarkdownContent.tsx
+++ b/src/app/components/MarkdownContent.tsx
@@ -1,80 +1,23 @@
 "use client";
 
-import React, { useCallback, useState } from "react";
+import React from "react";
 import ReactMarkdown from "react-markdown";
 import remarkGfm from "remark-gfm";
-import { Prism as SyntaxHighlighter } from "react-syntax-highlighter";
-import { oneDark } from "react-syntax-highlighter/dist/esm/styles/prism";
-import { Check, Copy } from "lucide-react";
-import { toast } from "sonner";
+import rehypeRaw from "rehype-raw";
+import rehypeSanitize from "rehype-sanitize";
 import { cn } from "@/lib/utils";
-import { copyText } from "@/lib/clipboard";
+import { CodeBlock } from "./CodeBlock";
+import { MermaidDiagram } from "./MermaidDiagram";
 
 interface MarkdownContentProps {
   content: string;
   className?: string;
+  /** When true, defer expensive renders (e.g. mermaid) until streaming ends. */
+  isStreaming?: boolean;
 }
 
-interface CodeBlockProps {
-  language: string;
-  value: string;
-}
-
-const CodeBlock = React.memo<CodeBlockProps>(({ language, value }) => {
-  const [copied, setCopied] = useState(false);
-  const handleCopy = useCallback(async () => {
-    if (await copyText(value)) {
-      setCopied(true);
-      setTimeout(() => setCopied(false), 2000);
-    } else {
-      toast.error("Couldn't copy to clipboard.");
-    }
-  }, [value]);
-
-  return (
-    <div className="group relative max-w-full">
-      <button
-        type="button"
-        onClick={handleCopy}
-        aria-label={copied ? "Copied" : "Copy code"}
-        className="absolute right-2 top-2 z-10 rounded-md border border-border bg-surface/80 p-1.5 text-[var(--color-text-tertiary)] opacity-0 backdrop-blur-sm transition-opacity hover:text-[var(--color-text-primary)] focus-visible:opacity-100 group-hover:opacity-100"
-      >
-        {copied ? (
-          <Check className="h-3.5 w-3.5" />
-        ) : (
-          <Copy className="h-3.5 w-3.5" />
-        )}
-      </button>
-      <SyntaxHighlighter
-        style={oneDark}
-        language={language}
-        PreTag="div"
-        className="max-w-full rounded-md text-sm"
-        wrapLines={true}
-        wrapLongLines={true}
-        lineProps={{
-          style: {
-            wordBreak: "break-all",
-            whiteSpace: "pre-wrap",
-            overflowWrap: "break-word",
-          },
-        }}
-        customStyle={{
-          margin: 0,
-          maxWidth: "100%",
-          overflowX: "auto",
-          fontSize: "0.875rem",
-        }}
-      >
-        {value}
-      </SyntaxHighlighter>
-    </div>
-  );
-});
-CodeBlock.displayName = "CodeBlock";
-
 export const MarkdownContent = React.memo<MarkdownContentProps>(
-  ({ content, className = "" }) => {
+  ({ content, className = "", isStreaming = false }) => {
     return (
       <div
         className={cn(
@@ -84,6 +27,7 @@ export const MarkdownContent = React.memo<MarkdownContentProps>(
       >
         <ReactMarkdown
           remarkPlugins={[remarkGfm]}
+          rehypePlugins={[rehypeRaw, rehypeSanitize]}
           components={{
             code({
               inline,
@@ -96,11 +40,12 @@ export const MarkdownContent = React.memo<MarkdownContentProps>(
               children?: React.ReactNode;
             }) {
               const match = /language-(\w+)/.exec(className || "");
+              const code = String(children).replace(/\n$/, "");
+              if (!inline && match?.[1] === "mermaid") {
+                return <MermaidDiagram code={code} isStreaming={isStreaming} />;
+              }
               return !inline && match ? (
-                <CodeBlock
-                  language={match[1]}
-                  value={String(children).replace(/\n$/, "")}
-                />
+                <CodeBlock language={match[1]} value={code} />
               ) : (
                 <code
                   className="bg-surface rounded-sm px-1 py-0.5 font-mono text-[0.9em]"
@@ -144,18 +89,38 @@ export const MarkdownContent = React.memo<MarkdownContentProps>(
             },
             ul({ children }: { children?: React.ReactNode }) {
               return (
-                <ul className="my-4 pl-6 [&>li:last-child]:mb-0 [&>li]:mb-1">
+                <ul className="my-4 list-disc pl-6 [&>li:last-child]:mb-0 [&>li]:mb-1">
                   {children}
                 </ul>
               );
             },
             ol({ children }: { children?: React.ReactNode }) {
               return (
-                <ol className="my-4 pl-6 [&>li:last-child]:mb-0 [&>li]:mb-1">
+                <ol className="my-4 list-decimal pl-6 [&>li:last-child]:mb-0 [&>li]:mb-1">
                   {children}
                 </ol>
               );
             },
+            details({ children, ...props }: React.HTMLAttributes<HTMLElement>) {
+              return (
+                <details
+                  {...props}
+                  className="my-4 rounded-md border border-border bg-surface/50 px-3 py-2 [&[open]>summary]:mb-2"
+                >
+                  {children}
+                </details>
+              );
+            },
+            summary({ children, ...props }: React.HTMLAttributes<HTMLElement>) {
+              return (
+                <summary
+                  {...props}
+                  className="cursor-pointer select-none font-medium text-[var(--color-text-primary)] hover:text-[var(--color-text-secondary)]"
+                >
+                  {children}
+                </summary>
+              );
+            },
             table({ children }: { children?: React.ReactNode }) {
               return (
                 <div className="my-4 overflow-x-auto">
diff --git a/src/app/components/MermaidDiagram.tsx b/src/app/components/MermaidDiagram.tsx
new file mode 100644
index 0000000..0243912
--- /dev/null
+++ b/src/app/components/MermaidDiagram.tsx
@@ -0,0 +1,131 @@
+"use client";
+
+import React, { useEffect, useId, useState } from "react";
+import { CodeBlock } from "./CodeBlock";
+import {
+  Dialog,
+  DialogContent,
+  DialogTitle,
+} from "@/components/ui/dialog";
+
+interface MermaidDiagramProps {
+  code: string;
+  /** While true, skip rendering — fall back to the source view. */
+  isStreaming?: boolean;
+}
+
+// Mermaid is a singleton with shared internal DOM state. Concurrent render()
+// calls clobber each other and silently drop SVGs, so we serialize every
+// call through this promise chain. Also caches the mermaid import + the
+// one-time initialize() so they don't run per-diagram.
+type MermaidModule = typeof import("mermaid").default;
+let mermaidLoader: Promise<MermaidModule> | null = null;
+let renderChain: Promise<unknown> = Promise.resolve();
+
+function loadMermaid(): Promise<MermaidModule> {
+  if (!mermaidLoader) {
+    mermaidLoader = import("mermaid").then((mod) => {
+      mod.default.initialize({
+        startOnLoad: false,
+        theme: "dark",
+        // "strict" forbids raw HTML in node labels — safer for AI-generated
+        // diagram source rendered alongside user content.
+        securityLevel: "strict",
+      });
+      return mod.default;
+    });
+  }
+  return mermaidLoader;
+}
+
+async function renderMermaid(id: string, code: string): Promise<string | null> {
+  const next = renderChain.then(async () => {
+    const mermaid = await loadMermaid();
+    // parse() with suppressErrors gives a boolean instead of the "red bomb"
+    // error-SVG that render() produces on bad input.
+    const parsed = await mermaid.parse(code, { suppressErrors: true });
+    if (!parsed) return null;
+    const { svg } = await mermaid.render(id, code);
+    return svg;
+  });
+  // Keep the chain alive even if this link throws — otherwise one bad
+  // diagram would freeze every subsequent render call.
+  renderChain = next.catch(() => undefined);
+  return next;
+}
+
+export const MermaidDiagram = React.memo<MermaidDiagramProps>(
+  ({ code, isStreaming = false }) => {
+    // useId is React 19's stable-across-renders unique id. Mermaid needs a
+    // CSS-safe id; useId returns strings like ":r3:" so strip the colons.
+    const reactId = useId().replace(/:/g, "");
+    const [svg, setSvg] = useState<string | null>(null);
+
+    useEffect(() => {
+      // Skip while the message is still streaming — `code` changes on every
+      // token, and queuing a render per change would back up mermaid's
+      // serialized chain and freeze the UI. Renders kick off once streaming
+      // ends (this effect re-runs because isStreaming is in the deps).
+      if (isStreaming) return;
+      let cancelled = false;
+      renderMermaid(`mermaid-${reactId}`, code)
+        .then((result) => {
+          if (!cancelled) setSvg(result);
+        })
+        .catch(() => {
+          if (!cancelled) setSvg(null);
+        });
+      return () => {
+        cancelled = true;
+      };
+    }, [code, reactId, isStreaming]);
+
+    // During streaming the source grows token-by-token. Avoid the syntax
+    // highlighter here — it re-tokenizes the full string on every keystroke
+    // and, multiplied across several diagrams, freezes the main thread.
+    if (isStreaming) {
+      return (
+        <pre className="my-4 max-w-full overflow-x-auto whitespace-pre-wrap break-words rounded-md bg-surface p-3 text-xs text-[var(--color-text-tertiary)]">
+          <code>{code}</code>
+        </pre>
+      );
+    }
+    if (!svg) {
+      return <CodeBlock language="mermaid" value={code} />;
+    }
+    return <MermaidPreview svg={svg} />;
+  }
+);
+MermaidDiagram.displayName = "MermaidDiagram";
+
+const MermaidPreview = React.memo<{ svg: string }>(({ svg }) => {
+  const [open, setOpen] = useState(false);
+  return (
+    <>
+      <div
+        role="button"
+        tabIndex={0}
+        aria-label="Open diagram in full view"
+        onClick={() => setOpen(true)}
+        onKeyDown={(e) => {
+          if (e.key === "Enter" || e.key === " ") {
+            e.preventDefault();
+            setOpen(true);
+          }
+        }}
+        className="my-4 max-w-full cursor-zoom-in overflow-x-auto rounded-md bg-surface p-4 transition-shadow hover:ring-2 hover:ring-primary/40 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary"
+        dangerouslySetInnerHTML={{ __html: svg }}
+      />
+      <Dialog open={open} onOpenChange={setOpen}>
+        <DialogContent className="max-h-[90vh] max-w-[90vw] overflow-auto p-6 sm:max-w-[90vw]">
+          <DialogTitle className="sr-only">Mermaid diagram</DialogTitle>
+          <div
+            className="[&_svg]:h-auto [&_svg]:max-w-none"
+            dangerouslySetInnerHTML={{ __html: svg }}
+          />
+        </DialogContent>
+      </Dialog>
+    </>
+  );
+});
+MermaidPreview.displayName = "MermaidPreview";