feat(plugins): add codex plugin package

.agents/plugins/marketplace.json

@@ -0,0 +1,20 @@
+{
+  "name": "basic-memory-local",
+  "interface": {
+    "displayName": "Basic Memory Local"
+  },
+  "plugins": [
+    {
+      "name": "codex",
+      "source": {
+        "source": "local",
+        "path": "./plugins/codex"
+      },
+      "policy": {
+        "installation": "AVAILABLE",
+        "authentication": "ON_INSTALL"
+      },
+      "category": "Developer Tools"
+    }
+  ]
+}

justfile

@@ -265,8 +265,8 @@ check: lint format typecheck test
 # Run all code quality checks and all test suites, including semantic benchmarks
 check-all: lint format typecheck test test-semantic
 
-# Validate every consolidated agent package (Claude Code, skills, Hermes, OpenClaw)
-package-check: package-check-claude-code package-check-skills package-check-hermes package-check-openclaw
+# Validate every consolidated agent package (Claude Code, Codex, skills, Hermes, OpenClaw)
+package-check: package-check-claude-code package-check-codex package-check-skills package-check-hermes package-check-openclaw
 
 # Alias for plugin/package validation during consolidation work
 plugins-check: package-check
@@ -278,6 +278,10 @@ agent-harness-check: package-check-claude-code package-check-hermes package-chec
 package-check-claude-code:
     just --justfile plugins/claude-code/justfile --working-directory plugins/claude-code check
 
+# Codex plugin: manifest, bundled skills, hooks, MCP config, and schemas
+package-check-codex:
+    just --justfile plugins/codex/justfile --working-directory plugins/codex check
+
 # Shared top-level SKILL.md source
 package-check-skills:
     just --justfile skills/justfile --working-directory skills check

plugins/codex/.codex-plugin/plugin.json

@@ -0,0 +1,46 @@
+{
+  "name": "codex",
+  "version": "0.1.0+codex.20260604201213",
+  "description": "A Codex-native bridge to Basic Memory for durable engineering context, decisions, and resumable checkpoints.",
+  "author": {
+    "name": "Basic Machines",
+    "email": "hello@basicmachines.co",
+    "url": "https://basicmemory.com"
+  },
+  "homepage": "https://docs.basicmemory.com",
+  "repository": "https://github.com/basicmachines-co/basic-memory/tree/main/plugins/codex",
+  "license": "MIT",
+  "keywords": [
+    "basic-memory",
+    "codex",
+    "memory",
+    "knowledge-graph",
+    "mcp",
+    "checkpoints"
+  ],
+  "skills": "./skills/",
+  "mcpServers": "./.mcp.json",
+  "interface": {
+    "displayName": "Basic Memory for Codex",
+    "shortDescription": "Carry decisions, active work, and handoffs across Codex threads",
+    "longDescription": "Use Basic Memory for Codex to orient from your durable knowledge graph, capture engineering decisions, checkpoint long-running work, and resume with repo-backed context across Codex sessions.",
+    "developerName": "Basic Machines",
+    "category": "Developer Tools",
+    "capabilities": [
+      "Interactive",
+      "Read",
+      "Write"
+    ],
+    "websiteURL": "https://basicmemory.com",
+    "privacyPolicyURL": "https://basicmemory.com/privacy",
+    "termsOfServiceURL": "https://basicmemory.com/terms",
+    "defaultPrompt": [
+      "Use Basic Memory to orient before changing this repo.",
+      "Checkpoint this Codex thread into Basic Memory.",
+      "Capture the decision we just made."
+    ],
+    "brandColor": "#2563EB",
+    "composerIcon": "./assets/app-icon.png",
+    "logo": "./assets/logo.png"
+  }
+}

plugins/codex/DEVELOPMENT.md

@@ -0,0 +1,76 @@
+# Basic Memory Codex Plugin Development
+
+This plugin is developed in-place from the Basic Memory repository. Codex installs local plugins
+through marketplaces, so local testing uses a repo-local marketplace wrapper rather than publishing
+anything external.
+
+## Local Marketplace
+
+The repo marketplace lives at:
+
+```text
+.agents/plugins/marketplace.json
+```
+
+It exposes this plugin as:
+
+```text
+codex@basic-memory-local
+```
+
+The marketplace entry points at `./plugins/codex`, resolved relative to the repository root.
+
+## First-Time Setup
+
+From the repository root:
+
+```bash
+codex plugin marketplace add "$(git rev-parse --show-toplevel)"
+codex plugin add codex@basic-memory-local
+```
+
+Start a new Codex thread after installing. New threads are the reliable boundary for picking up
+plugin skills, hooks, and MCP configuration.
+
+## Iteration Loop
+
+After changing files in `plugins/codex`, run the local checks:
+
+```bash
+just package-check-codex
+```
+
+Then update the manifest cachebuster and reinstall from the local marketplace:
+
+```bash
+python3 "$CODEX_PLUGIN_CREATOR_SCRIPTS/update_plugin_cachebuster.py" \
+  "$(git rev-parse --show-toplevel)/plugins/codex"
+codex plugin add codex@basic-memory-local
+```
+
+Start a fresh Codex thread to test the updated plugin.
+
+## Useful Checks
+
+List configured marketplaces:
+
+```bash
+codex plugin marketplace list
+```
+
+List plugins Codex can see:
+
+```bash
+codex plugin list
+```
+
+Run the full package validation gate when touching plugin packaging, shared skills, or integration
+metadata:
+
+```bash
+just package-check
+```
+
+To also run Codex's scaffold validator during `just package-check-codex`, set
+`CODEX_PLUGIN_VALIDATOR` to the local `plugin-creator` validator script before
+running the check.

plugins/codex/README.md

@@ -0,0 +1,74 @@
+# Basic Memory for Codex
+
+Basic Memory for Codex is the Codex-native bridge between a working coding thread
+and Basic Memory's durable knowledge graph.
+
+It is not a 1:1 copy of the Claude Code plugin. This version leans into Codex
+workflows: repo orientation, long-running goals, changed-file evidence, explicit
+verification, decision capture, and resumable checkpoints.
+
+## What It Does
+
+- **Orient from memory.** The `bm-orient` skill reads active tasks, open
+  decisions, and recent Codex checkpoints before substantial work.
+- **Checkpoint work.** The `bm-checkpoint` skill and `PreCompact` hook write
+  `type: codex_session` notes with the current work cursor.
+- **Capture decisions.** The `bm-decide` skill records durable engineering
+  decisions with rationale, alternatives, and consequences.
+- **Remember lightly.** The `bm-remember` skill saves small facts without turning
+  them into a full decision or session note.
+- **Share deliberately.** The `bm-share` skill copies personal notes to configured
+  team projects only after confirmation.
+- **Report status.** The `bm-status` skill shows configuration, reachability, and
+  recent memory state.
+
+## Package Contents
+
+| Path | Role |
+| --- | --- |
+| `.codex-plugin/plugin.json` | Codex plugin manifest |
+| `.mcp.json` | Basic Memory MCP server configuration |
+| `hooks/hooks.json` | SessionStart and PreCompact hook registration |
+| `hooks/session-start.sh` | Injects a compact memory brief at thread start |
+| `hooks/pre-compact.sh` | Writes an automatic Codex checkpoint before compaction |
+| `skills/` | Codex-native Basic Memory workflows |
+| `schemas/` | Seed schemas for Codex sessions, decisions, and tasks |
+
+## Configuration
+
+Run the setup skill, or create `.codex/basic-memory.json` in a repo:
+
+```json
+{
+  "basicMemory": {
+    "primaryProject": "my-project",
+    "secondaryProjects": [],
+    "teamProjects": {},
+    "focus": "code/dev",
+    "captureFolder": "codex-sessions",
+    "rememberFolder": "codex-remember",
+    "recallTimeframe": "7d",
+    "placementConventions": "Put decisions in decisions/ and work checkpoints in codex-sessions/."
+  }
+}
+```
+
+Codex plugin hooks must be reviewed and trusted before they run. Open `/hooks` in
+Codex after enabling the plugin and trust the Basic Memory hook definitions.
+
+## Development
+
+From this directory:
+
+```bash
+just check
+```
+
+From the repo root:
+
+```bash
+just package-check-codex
+```
+
+The package intentionally keeps Codex-specific configuration separate from
+Claude's `.claude/settings.json`.

plugins/codex/hooks/hooks.json

@@ -0,0 +1,31 @@
+{
+  "description": "Basic Memory for Codex hooks - orient from the graph on session start and checkpoint before compaction.",
+  "hooks": {
+    "SessionStart": [
+      {
+        "matcher": "startup|resume|compact",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "${PLUGIN_ROOT}/hooks/session-start.sh",
+            "statusMessage": "Loading Basic Memory context",
+            "timeout": 30
+          }
+        ]
+      }
+    ],
+    "PreCompact": [
+      {
+        "matcher": "manual|auto",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "${PLUGIN_ROOT}/hooks/pre-compact.sh",
+            "statusMessage": "Checkpointing Codex work to Basic Memory",
+            "timeout": 60
+          }
+        ]
+      }
+    ]
+  }
+}