diff --git a/.agents/plugins/marketplace.json b/.agents/plugins/marketplace.json
index 53df614..b789d4e 100644
--- a/.agents/plugins/marketplace.json
+++ b/.agents/plugins/marketplace.json
@@ -39,6 +39,18 @@
         "authentication": "ON_INSTALL"
       },
       "category": "Developer Tools"
+    },
+    {
+      "name": "trellis",
+      "source": {
+        "source": "local",
+        "path": "./plugins/trellis"
+      },
+      "policy": {
+        "installation": "AVAILABLE",
+        "authentication": "ON_INSTALL"
+      },
+      "category": "Developer Tools"
     }
   ]
 }
diff --git a/README.md b/README.md
index 23cfa11..b00ab16 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@ codex plugin marketplace add raintree-technology/plugins
 codex plugin add docpull@raintree
 codex plugin add hig-doctor@raintree
 codex plugin add raintree-standards@raintree
+codex plugin add trellis@raintree
 ```
 
 Stable marketplace commands:
diff --git a/plugins.lock.json b/plugins.lock.json
index bf45716..748c216 100644
--- a/plugins.lock.json
+++ b/plugins.lock.json
@@ -75,6 +75,14 @@
         "plugin"
       ],
       "version": "1.1.1"
+    },
+    {
+      "name": "trellis",
+      "repository": "https://github.com/raintree-technology/trellis.git",
+      "ref": "v0.3.1",
+      "commit": "fef84a32dff8694c6e6aa726eb7aef42b70997ab",
+      "sourcePaths": ["plugin"],
+      "version": "0.3.1"
     }
   ]
 }
diff --git a/plugins/trellis/.codex-plugin/plugin.json b/plugins/trellis/.codex-plugin/plugin.json
new file mode 100644
index 0000000..be42167
--- /dev/null
+++ b/plugins/trellis/.codex-plugin/plugin.json
@@ -0,0 +1,34 @@
+{
+  "name": "trellis",
+  "version": "0.3.1",
+  "description": "Remediate Trellis findings through its stable todo schema and repository checks.",
+  "author": {
+    "name": "Raintree Technology",
+    "email": "support@raintree.technology",
+    "url": "https://raintree.technology"
+  },
+  "homepage": "https://github.com/raintree-technology/trellis",
+  "repository": "https://github.com/raintree-technology/trellis",
+  "license": "MIT",
+  "keywords": ["biome", "javascript", "typescript", "lint", "remediation"],
+  "skills": "./skills/",
+  "interface": {
+    "displayName": "Trellis",
+    "shortDescription": "Remediate shared JavaScript and TypeScript policy findings.",
+    "longDescription": "Trellis turns its existing deterministic todo report into a bounded remediation workflow. It preserves repository-specific suppressions and treats warnings as human-judgment work.",
+    "developerName": "Raintree Technology",
+    "category": "Developer Tools",
+    "capabilities": [
+      "Read Trellis todo reports",
+      "Remediate one rule group",
+      "Verify repository checks"
+    ],
+    "websiteURL": "https://github.com/raintree-technology/trellis",
+    "brandColor": "#0F6B5D",
+    "defaultPrompt": [
+      "Remediate the next Trellis rule group in this repository.",
+      "Explain the blocking Trellis findings without editing.",
+      "Review Trellis warnings that need human judgment."
+    ]
+  }
+}
diff --git a/plugins/trellis/README.md b/plugins/trellis/README.md
new file mode 100644
index 0000000..8031967
--- /dev/null
+++ b/plugins/trellis/README.md
@@ -0,0 +1,8 @@
+# Trellis Codex plugin recipe
+
+This recipe provides one remediation skill for Trellis 0.3.1. The skill consumes
+the package's existing `trellis todo` JSON report. It does not duplicate the
+policy or define another finding schema.
+
+The consuming repository owns installation, dependency changes, Biome commands,
+tests, architecture rules, and justified local suppressions.
diff --git a/plugins/trellis/fixtures/activation.json b/plugins/trellis/fixtures/activation.json
new file mode 100644
index 0000000..f71cde3
--- /dev/null
+++ b/plugins/trellis/fixtures/activation.json
@@ -0,0 +1,9 @@
+{
+  "schemaVersion": 1,
+  "skill": "trellis-remediate",
+  "positive": [
+    "Remediate the next Trellis rule group in this repository.",
+    "Triage these trellis todo errors and fix one group."
+  ],
+  "negative": ["Run ESLint and fix everything.", "Install a formatter in this new project."]
+}
diff --git a/plugins/trellis/skills/trellis-remediate/SKILL.md b/plugins/trellis/skills/trellis-remediate/SKILL.md
new file mode 100644
index 0000000..8545563
--- /dev/null
+++ b/plugins/trellis/skills/trellis-remediate/SKILL.md
@@ -0,0 +1,45 @@
+---
+name: trellis-remediate
+description: Use when the user asks to fix, remediate, triage, or work through Trellis findings in a JavaScript or TypeScript repository. Detect whether the repository already uses Trellis before acting. Do not activate for a generic lint request that does not mention Trellis or for installing Trellis without explicit user authorization.
+---
+
+# Trellis remediation
+
+Use Trellis's existing todo report as the handoff contract. Do not reproduce its
+policy in this skill and do not change its JSON schema.
+
+## Establish the repository state
+
+1. Inspect package manifests, the lockfile, Biome configuration, scripts, and
+   repository guidance for `@raintree-technology/trellis` adoption.
+2. If Trellis or its exact Biome peer dependency is missing, stop before
+   installation or any dependency change. Ask for explicit authorization and
+   state the proposed versions and files.
+3. Run the repository's existing command that invokes `trellis todo`. If no
+   script exists but the installed package is resolvable, run the installed
+   executable without modifying dependencies.
+4. Confirm the report has `schemaVersion: 1`. Stop on an unknown schema.
+
+## Remediate one rule group
+
+1. Group open todos by `rule`. Select one group only.
+2. Treat `error` and `fatal` findings as blocking candidates. Confirm whether
+   the repository's Biome gate makes them release-blocking.
+3. Treat warnings as human-judgment work. Inspect behavior and architecture
+   before changing code.
+4. Apply the smallest behavior-preserving correction that follows each todo's
+   replacement direction.
+5. Preserve a narrow local suppression when its reason is still justified. Do
+   not remove or broaden suppressions to make the report cleaner.
+6. Stop after the selected rule group. Report remaining groups for a later pass.
+
+## Verify
+
+After edits, rerun:
+
+1. The repository's Trellis todo command.
+2. The repository's Biome check.
+3. Tests relevant to the changed behavior.
+
+Report resolved IDs, remaining findings, preserved suppressions, exact checks,
+and failures. A clean todo report does not replace the Biome gate or tests.