diff --git a/.claude/CLAUDE.md b/.claude/CLAUDE.md
index 9665c1b..e23705a 100644
--- a/.claude/CLAUDE.md
+++ b/.claude/CLAUDE.md
@@ -34,5 +34,5 @@ moon tag-node tasks; python: uv via tag-python. Shell: shellcheck (CI + lint).
 
 Harness pins are bumped deliberately (PR per bump, changelog reviewed) — this
 repo's value is *curated known-good*, not latest. Current: pi-coding-agent
-0.80.10 · opencode-ai 1.18.3 · hermes-agent 0.18.0 ·
+0.80.10 · opencode-ai 1.18.5 · hermes-agent 0.18.0 ·
 @oh-my-pi/pi-coding-agent 16.3.12 (bun).
diff --git a/packages/harness-opencode/README.md b/packages/harness-opencode/README.md
index 7d4cca2..7a0cdd7 100644
--- a/packages/harness-opencode/README.md
+++ b/packages/harness-opencode/README.md
@@ -6,7 +6,7 @@ consumes: local-models/README.md (endpoint wiring)
 
 # harness-opencode
 
-[opencode](https://opencode.ai) at curated pin **`opencode-ai` 1.18.3**.
+[opencode](https://opencode.ai) at curated pin **`opencode-ai` 1.18.5**.
 
 ```bash
 ./install.sh   # npm install -g at the pin, config preset + plugins symlinked
diff --git a/packages/harness-opencode/install.sh b/packages/harness-opencode/install.sh
index 218be2b..da438d3 100755
--- a/packages/harness-opencode/install.sh
+++ b/packages/harness-opencode/install.sh
@@ -4,7 +4,7 @@
 # install script; we deliberately use the npm path).
 set -euo pipefail
 
-OPENCODE_VERSION="1.18.3"
+OPENCODE_VERSION="1.18.5"
 PKG_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 command -v npm >/dev/null 2>&1 || { echo "npm not found — run scripts/bootstrap.sh first (proto provides node)" >&2; exit 1; }
diff --git a/packages/harness-opencode/package.json b/packages/harness-opencode/package.json
index 38b492d..14d6053 100644
--- a/packages/harness-opencode/package.json
+++ b/packages/harness-opencode/package.json
@@ -9,7 +9,7 @@
     "lint": "tsc --noEmit"
   },
   "devDependencies": {
-    "@opencode-ai/plugin": "1.18.3",
+    "@opencode-ai/plugin": "1.18.5",
     "typescript": "7.0.2"
   }
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 445c89b..1af2514 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -23,8 +23,8 @@ importers:
   packages/harness-opencode:
     devDependencies:
       '@opencode-ai/plugin':
-        specifier: 1.18.3
-        version: 1.18.3
+        specifier: 1.18.5
+        version: 1.18.5
       typescript:
         specifier: 7.0.2
         version: 7.0.2
@@ -335,12 +335,12 @@ packages:
     cpu: [x64]
     os: [win32]
 
-  '@opencode-ai/plugin@1.18.3':
-    resolution: {integrity: sha512-hAm/hZkSCsMSNHVy9DKmFtZAve/qYoIWpduNPcvXnnKK7NMlJEOQitA6CQC67Ym5DFKypDW1TC9YO6S1WdGtpg==}
+  '@opencode-ai/plugin@1.18.5':
+    resolution: {integrity: sha512-o1loQw5lh3zK7dgTN25Zh4tK+bW7BdszyDwdSumj0ahaR1lXWjYjVbAZuOQxeEQfkr266cqNi2x8UrrlkI0n7A==}
     peerDependencies:
-      '@opentui/core': '>=0.4.3'
-      '@opentui/keymap': '>=0.4.3'
-      '@opentui/solid': '>=0.4.3'
+      '@opentui/core': '>=0.4.5'
+      '@opentui/keymap': '>=0.4.5'
+      '@opentui/solid': '>=0.4.5'
     peerDependenciesMeta:
       '@opentui/core':
         optional: true
@@ -349,8 +349,8 @@ packages:
       '@opentui/solid':
         optional: true
 
-  '@opencode-ai/sdk@1.18.3':
-    resolution: {integrity: sha512-Mevo4e6kQwbvto9E+42KSIVMhp+JBu+SwQhC5AomAvrV6Xkio3U249T+xDILDCXhl5Z/Hi/DlAuVLzpGnuh0gg==}
+  '@opencode-ai/sdk@1.18.5':
+    resolution: {integrity: sha512-7KgMvP5/1oxbhHj6kYBtPSTEdFKYpUeEYOzBTKdzSaRpapUpFFdn6Hkus3rr0rljO0kukWZIgRd3DrVBwTULGA==}
 
   '@opentelemetry/api@1.9.0':
     resolution: {integrity: sha512-3giAOQvZiH5F9bMlMiv8+GSPMeqg0dbaeo58/0SlA9sxSqZhnUtxzX9/2FzyhS9sWQf5S0GJE0AKBrFqjpeYcg==}
@@ -1306,14 +1306,14 @@ snapshots:
   '@msgpackr-extract/msgpackr-extract-win32-x64@3.0.4':
     optional: true
 
-  '@opencode-ai/plugin@1.18.3':
+  '@opencode-ai/plugin@1.18.5':
     dependencies:
       '@ai-sdk/provider': 3.0.8
-      '@opencode-ai/sdk': 1.18.3
+      '@opencode-ai/sdk': 1.18.5
       effect: 4.0.0-beta.83
       zod: 4.1.8
 
-  '@opencode-ai/sdk@1.18.3':
+  '@opencode-ai/sdk@1.18.5':
     dependencies:
       cross-spawn: 7.0.6