Simple Memory Plugin for OpenCode

A persistent memory plugin for OpenCode that enables the AI assistant to remember context across sessions.

OpenCode compatibility

Version 2.x of this plugin supports both OpenCode generations from one package:

OpenCode	Plugin version	Config form
OpenCode 2 (V2)	@knikolov/opencode-plugin-simple-memory@^2	plugins (object form below)
OpenCode 1 ≥ 1.18.29	@knikolov/opencode-plugin-simple-memory@^2	plugin or plugins (legacy tuple form)
OpenCode 1 < 1.18.29	@knikolov/opencode-plugin-simple-memory@^1	plugin (legacy tuple form)

The package default-exports both entrypoints: OpenCode 2 reads the V2 setup() registration, OpenCode 1 calls the legacy server() function. Tool names, option names, and the storage format are identical across both, so existing configs, AGENTS.md guidance, and permission rules keep working.

Memories live in .opencode/memory/ as plain logfmt files. Installing, upgrading, or downgrading the plugin never touches them.

Setup

Add the plugin to your OpenCode config:

{
  "$schema": "https://opencode.ai/config.json",
  "plugins": ["@knikolov/opencode-plugin-simple-memory"]
}

On OpenCode 1 the legacy tuple form still works:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": ["@knikolov/opencode-plugin-simple-memory"]
}

Start using memory commands in your conversations.

Automatic memory loading and saving are opt-in. When enabled, the plugin can load and save context automatically:

• Before a response, it injects a short relevant-memory block based on the latest user message.
• When the user explicitly says “remember ...”, it saves that memory automatically.
• It does not automatically save arbitrary conversation content.

Updating

Warning

OpenCode does NOT auto-update plugins.

To get the latest version, clear the cached plugin and let OpenCode reinstall it:

# Remove the plugin from cache (OpenCode 2)
rm -rf ~/.cache/opencode/npm/@knikolov/opencode-plugin-simple-memory@* \
       ~/.cache/opencode/packages/@knikolov/opencode-plugin-simple-memory*

# OpenCode 1 kept plugin caches elsewhere
rm -rf ~/.cache/opencode/node_modules/@knikolov/opencode-plugin-simple-memory

# Run OpenCode to trigger reinstall
opencode

If the plugin shows as failed with Plugin must export a default definition with an id and an effect or setup function, a stale pre-2.0 copy is still cached: clear the cache as above and restart OpenCode. A failed activation state can stick to a project until OpenCode restarts.

Clearing the cache installs the latest 2.x. On OpenCode 1 older than 1.18.29, pin the plugin first so the reinstall does not break your setup:

{
  "plugins": ["@knikolov/opencode-plugin-simple-memory@^1"]
}

Tools

The plugin provides nine tools:

Tool	Description
memory_remember	Store a new memory
memory_recall	Retrieve memories by scope, type, or search query
memory_update	Update an existing memory
memory_forget	Delete a memory (with audit logging)
memory_list	List all scopes and types for discovery
memory_export	Export memories as jsonl, json, or logfmt
memory_import	Import memories from jsonl, json, or compatible logfmt
memory_compact	Rewrite memory files chronologically and remove exact duplicates
memory_context	Build a compact relevant-memory context pack

Memory Types

• decision - Architectural or design decisions
• learning - Things learned during development
• preference - User or project preferences
• blocker - Current blockers or issues
• context - General context information
• pattern - Recurring patterns or conventions

Example Usage

User: Remember that my name is Kris

AI: [calls memory_remember with type="context", scope="user", 
     content="User's name is Kris"]
    
    I've stored that your name is Kris.

User: My preferred programming language is Erlang

AI: [calls memory_remember with type="preference", scope="user", 
     content="Preferred programming language is Erlang"]
    
    Got it! I've noted that your preferred programming language is Erlang.

User: What do you know about me?

AI: [calls memory_recall with scope="user"]
    
    Here's what I know about you:
    - Your name is Kris
    - Your preferred programming language is Erlang

User: Actually, I prefer Elixir now.

AI: [calls memory_update with type="preference", scope="user", 
     content="Preferred programming language is Elixir"]
    
    Updated your language preference to Elixir.

User: Forget my language preference

AI: [calls memory_forget with type="preference", scope="user", 
     reason="User requested removal"]
    
    Done. I've removed your language preference from memory.

Recall Filters

memory_recall supports the original filters plus optional richer filters:

• scope - filter by scope. By default this keeps the original contains-style matching.
• type - filter by memory type.
• query - rank by matching words across type, scope, content, and tags.
• limit - maximum results. Query results return the best matches; non-query results return the latest memories.
• tags - require all provided tags.
• since / until - filter by ISO timestamp or date prefix.
• match - scope matching mode: contains, exact, or prefix.

Automatic Context

Automatic context loading is disabled by default. When autoLoad is enabled, the plugin uses OpenCode's prompt/system hooks (the V2 prompt and context session hooks, or the legacy V1 chat.message and experimental.chat.system.transform hooks) to remember the latest user message, search active memories, and inject a compact block like this into system context:

Relevant Memory:
- context/deploy/staging: Use materialize-deployments.cjs for staging runtime restart
- context/tests: Run make staging-live-onboarding-e2e for staging onboarding

Automatic context saving is also disabled by default. When autoSave is enabled, it is intentionally conservative and only stores explicit requests such as:

remember that I prefer minimal diffs

That request is stored as a preference memory in scope user with tag auto. Other explicit remember requests default to context/user unless they look like a decision, blocker, pattern, or preference.

Configure the behavior through plugin options in the V2 object form. The options object is passed to the plugin:

{
  "$schema": "https://opencode.ai/config.json",
  "plugins": [
    {
      "package": "@knikolov/opencode-plugin-simple-memory",
      "options": {
        "autoLoad": true,
        "autoSave": true,
        "autoHookTimeoutMs": 100,
        "contextLimit": 5,
        "contextMaxChars": 1200,
        "contextMinScore": 1,
        "autoSaveScope": "user"
      }
    }
  ]
}

On OpenCode 1, the legacy tuple form passes the same options:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": [
    [
      "@knikolov/opencode-plugin-simple-memory",
      {
        "autoLoad": true,
        "autoSave": true
      }
    ]
  ]
}

Configuration options:

Option	Default	Description
autoLoad	false	Enables automatic relevant-memory injection before responses. The plugin uses the latest user message as the search query and appends a compact Relevant Memory: block to system context when matches exist.
autoSave	false	Enables automatic saving only for explicit user requests like remember that I prefer minimal diffs. It does not save arbitrary conversation content.
autoHookTimeoutMs	100	Maximum time each automatic hook can spend on memory work. Hooks fail open after this timeout so memory loading or saving cannot block normal responses.
contextLimit	5	Maximum number of memories included in the automatic relevant-memory block.
contextMaxChars	1200	Maximum character budget for the automatic relevant-memory block. Matching memories are truncated to stay within this budget.
contextMinScore	1 when there is a query	Minimum relevance score required for automatic context loading. Increase this to make injected memory stricter; set it lower to include weaker matches.
autoSaveScope	"user"	Scope used for automatic explicit remember ... saves unless the inferred memory itself provides something more specific.

To keep automatic behavior disabled while retaining manual tools, omit options entirely or set both flags to false:

{
  "$schema": "https://opencode.ai/config.json",
  "plugins": [
    {
      "package": "@knikolov/opencode-plugin-simple-memory",
      "options": {
        "autoLoad": false,
        "autoSave": false
      }
    }
  ]
}

For local development, point OpenCode at the checkout with a file:// URL and pass the same options:

{
  "$schema": "https://opencode.ai/config.json",
  "plugins": [
    {
      "package": "file:///absolute/path/to/opencode-plugin-simple-memory",
      "options": {
        "autoLoad": true,
        "autoSave": true
      }
    }
  ]
}

OpenCode loads plugin configuration at startup. Restart OpenCode after changing configuration.

Storage Format

Memory files are daily logfmt files named YYYY-MM-DD.logfmt under .opencode/memory/.

Each active memory record uses these fields:

ts=2026-05-28T10:00:00.000Z type=context scope=api content="Remember this" issue=#51 tags=backend,current

Compatibility notes:

• Existing unquoted scope, issue, and tags records remain readable.
• New records quote fields only when needed, except content, which is always quoted.
• Multiline content is stored on one physical line using escaped \n sequences and is restored during recall/export.
• Updates and deletes append audit records to .opencode/memory/deletions.logfmt.

Maintenance

memory_forget keeps its original behavior when called with only scope, type, and reason: it deletes all exact matches. To delete only one matching memory, pass query.

memory_export and memory_import can move memories between projects or back up the store. jsonl is the default export/import format.

memory_compact removes exact duplicate active records and rewrites active memory files in chronological order. Use dryRun: true to preview the change.

Local Development

Clone the repository and install dependencies:

git clone https://github.com/cnicolov/opencode-plugin-simple-memory.git
cd opencode-plugin-simple-memory
bun install

Run checks:

bun test
bun run typecheck

Point your OpenCode config to the local checkout via a file:// URL:

{
  "$schema": "https://opencode.ai/config.json",
  "plugins": ["file:///absolute/path/to/opencode-plugin-simple-memory"]
}

Replace /absolute/path/to/opencode-plugin-simple-memory with your actual path.