Agent skill

Plugin Development

Create, test, sign, and publish Memoria governance plugins. An agent skill from matrixorigin/memoria.

Apache-2.0Auto-check passedBackend & APIs

Install Plugin Development

skills CLI

$ npx skills add matrixorigin/memoria --skill plugin-development -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install matrixorigin/memoria plugin-development --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/matrixorigin/memoria.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/plugin-development .claude/skills/plugin-development && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "plugin-development" agent skill from https://github.com/matrixorigin/memoria/tree/main/skills/plugin-development into .claude/skills/plugin-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "plugin-development", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/matrixorigin/memoria/tree/main/skills/plugin-development

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add matrixorigin/memoria --skill plugin-development -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install matrixorigin/memoria plugin-development --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/matrixorigin/memoria.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/plugin-development .agents/skills/plugin-development && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "plugin-development" agent skill from https://github.com/matrixorigin/memoria/tree/main/skills/plugin-development into .agents/skills/plugin-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "plugin-development", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add matrixorigin/memoria --skill plugin-development -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install matrixorigin/memoria plugin-development --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/matrixorigin/memoria.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/plugin-development .cursor/skills/plugin-development && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "plugin-development" agent skill from https://github.com/matrixorigin/memoria/tree/main/skills/plugin-development into .cursor/skills/plugin-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "plugin-development", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/matrixorigin/memoria.git --path skills/plugin-development

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add matrixorigin/memoria --skill plugin-development -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install matrixorigin/memoria plugin-development --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/matrixorigin/memoria.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/plugin-development .gemini/skills/plugin-development && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "plugin-development" agent skill from https://github.com/matrixorigin/memoria/tree/main/skills/plugin-development into .gemini/skills/plugin-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "plugin-development", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install matrixorigin/memoria plugin-development

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add matrixorigin/memoria --skill plugin-development -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/matrixorigin/memoria.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/plugin-development .github/skills/plugin-development && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "plugin-development" agent skill from https://github.com/matrixorigin/memoria/tree/main/skills/plugin-development into .github/skills/plugin-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "plugin-development", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add matrixorigin/memoria --skill plugin-development -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install matrixorigin/memoria plugin-development --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/matrixorigin/memoria.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/plugin-development .opencode/skills/plugin-development && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "plugin-development" agent skill from https://github.com/matrixorigin/memoria/tree/main/skills/plugin-development into .opencode/skills/plugin-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "plugin-development", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: plugin-development
GitHub stars: 607
Token cost: ~1k tokens
SKILL.md length: 184 words
Files: 1
Skills in repo: 9
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

Create, test, sign, and publish Memoria governance plugins. An agent skill from matrixorigin/memoria.

Works in 4 steps: Local dev (no signature, no DB) → Contract testing → Sign and publish → …
Managing plugins
SKILL.md covers Quick Start, manifest.json, policy.rhai and Runtime Types, plus 4 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Plugin Development is an agent skill from matrixorigin/memoria. Create, test, sign, and publish Memoria governance plugins. Covers Rhai and gRPC runtimes, manifest format, lifecycle. Use when developing or managing plugins.

Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Backend & APIs, covering Hooks and plugins and gRPC and Protobuf. It works with gRPC. The repository describes itself as: Secure memory management for AI Agents • Ensures data integrity • Reduces hallucinations • Maintains consistent long-term context. The licence is Apache-2.0.

When your agent uses it

Managing plugins
Tasks that involve Hooks and plugins
Tasks that involve gRPC and Protobuf

Example prompts

“/plugin-development”

Workflow steps

4 steps, taken from the step headings in SKILL.md.

Local dev (no signature, no DB)
Contract testing
Sign and publish
Production

What it can do on your machine

Read from SKILL.md and the folder at commit 81c5cc6. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are bash, json and rhai).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Plugin Development loads about 1k tokens when it runs. Until then it costs about 45 tokens; SKILL.md has 184 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~45
When it runs · the whole SKILL.md, loaded when a task matches: ~1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from matrixorigin/memoria at commit 81c5cc6, republished under its Apache-2.0 licence (© matrixorigin). 184 words, ~1,043 tokens.

Download SKILL.mdSave it as .claude/skills/plugin-development/SKILL.md (or your agent's skills folder).

name: plugin-development
description: Create, test, sign, and publish Memoria governance plugins. Covers Rhai and gRPC runtimes, manifest format, lifecycle. Use when developing or managing plugins.

Quick Start

bash

memoria plugin init --dir ./my-plugin --name my-governance \
  --capabilities governance.plan,governance.execute

Creates:

my-plugin/
├── manifest.json    # Plugin metadata, permissions, limits
└── policy.rhai      # Governance logic (Rhai script)

manifest.json

json

{
  "name": "memoria-my-governance",
  "version": "0.1.0",
  "api_version": "v1",
  "runtime": "rhai",
  "entry": { "rhai": { "script": "policy.rhai", "entrypoint": "memoria_plugin" } },
  "capabilities": ["governance.plan", "governance.execute"],
  "compatibility": { "memoria": ">=0.1.0" },
  "permissions": { "network": false, "filesystem": false, "env": [] },
  "limits": { "timeout_ms": 500, "max_memory_mb": 32, "max_output_bytes": 8192 },
  "integrity": { "sha256": "", "signature": "", "signer": "" },
  "metadata": { "display_name": "My Governance Plugin" }
}

Key fields:

runtime: rhai (sandboxed) or grpc (remote service)
capabilities: must include governance.plan and/or governance.execute
integrity: auto-filled by memoria plugin publish

policy.rhai

rhai

fn memoria_plugin(ctx) {
    if ctx["phase"] == "plan" {
        let review = decision("my-plugin:check", "Description", 0.8);
        review["evidence"] = [evidence("source", "What was found")];
        return #{
            requires_approval: false,
            actions: [review],
            estimated_impact: #{ "my.metric": 1.0 }
        };
    }
    if ctx["phase"] == "execute" {
        return #{ warnings: [], metrics: #{ "my.metric": 1.0 } };
    }
    return #{};
}

Built-in helpers: decision(id, reason, confidence), evidence(source, description)

Runtime Types

Runtime	Sandboxing	Use Case
`rhai`	In-process, memory/time limited	Simple rules, no external deps
`grpc`	Out-of-process, network call	Complex logic, external services

Development Workflow

1. Local dev (no signature, no DB)

bash

MEMORIA_GOVERNANCE_ENABLED=true \
MEMORIA_GOVERNANCE_PLUGIN_DIR=./my-plugin \
memoria serve

2. Contract testing

See memoria-service/tests/plugin_contract.rs — uses GovernancePluginContractHarness.

3. Sign and publish

bash

memoria plugin dev-keygen --dir ./my-plugin
memoria plugin signer-add --signer my-team --public-key <base64-ed25519>
memoria plugin publish --package-dir ./my-plugin
memoria plugin review --key governance:my-governance:v1 --version 0.1.0 --status active
memoria plugin activate --domain governance --binding default \
  --plugin-key governance:my-governance:v1 --version 0.1.0

4. Production

bash

MEMORIA_GOVERNANCE_ENABLED=true
MEMORIA_GOVERNANCE_PLUGIN_BINDING=default
MEMORIA_GOVERNANCE_PLUGIN_SUBJECT=system

Lifecycle

scaffold → local dev → sign → publish → review → activate → scheduler loads

CLI Reference

Command	Description
`memoria plugin init --dir <d> --name <n>`	Scaffold
`memoria plugin dev-keygen --dir <d>`	Generate ed25519 keypair
`memoria plugin publish --package-dir <d>`	Sign and publish
`memoria plugin list`	List published
`memoria plugin review --key <k> --version <v> --status <s>`	Review
`memoria plugin activate --domain <d> --binding <b> --plugin-key <k> --version <v>`	Activate
`memoria plugin rules`	List binding rules
`memoria plugin score --key <k> --version <v>`	Compatibility score
`memoria plugin matrix`	Compatibility matrix
`memoria plugin events`	Audit events

Code Reference

File	Purpose
`plugin/manifest.rs`	PluginManifest, PluginPackage, signing
`plugin/repository.rs`	Publish, review, score, binding CRUD
`plugin/rhai_runtime.rs`	RhaiGovernanceStrategy
`plugin/grpc_runtime.rs`	GrpcGovernanceStrategy
`plugin/governance_hook.rs`	Contract testing harness
`plugin/templates/`	Rhai template

Files

Just SKILL.md in skills/plugin-development of matrixorigin/memoria.

Open the folder on GitHubat commit 81c5cc6

Compare with similar skills

Plugin Development next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Plugin Development compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Plugin Development this skillmatrixorigin/memoria	607	—	~1k	Automated safety check: Pass	Apache-2.0	today
Use Yaakmountain-loop/yaak	19k	—	~1.9k	Automated safety check: Pass	MIT	today
Golang Proantoniopaya22/go-rest-template	172	3 repos	~1.2k	Automated safety check: Pass	MIT	6 mo ago
Debug Grpc ConnectionGetBindu/Bindu	10k	—	~1.2k	Automated safety check: Pass	Custom licence	1 mo ago
Aspnet Corefanslead/ReverseProxy.Store	163	2 repos	~1.4k	Automated safety check: Pass	Apache-2.0	1 mo ago
Regenerate Grpc StubsGetBindu/Bindu	10k	—	~810	Automated safety check: Pass	Custom licence	1 mo ago

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Questions about Plugin Development

What does Plugin Development do?

Create, test, sign, and publish Memoria governance plugins. An agent skill from matrixorigin/memoria. Plugin Development is an agent skill from matrixorigin/memoria. Create, test, sign, and publish Memoria governance plugins.

When should I use Plugin Development?

Plugin Development fits situations like: managing plugins; tasks that involve Hooks and plugins; tasks that involve gRPC and Protobuf.

How do I install Plugin Development in Claude Code?

Run `npx skills add matrixorigin/memoria --skill plugin-development -a claude-code`. Or copy the skill folder (skills/plugin-development in matrixorigin/memoria) into .claude/skills/plugin-development in your project. Claude Code loads it when a task matches its description.

How do I install Plugin Development in Codex?

Run `npx skills add matrixorigin/memoria --skill plugin-development -a codex`. Or copy the skill folder (skills/plugin-development in matrixorigin/memoria) into .agents/skills/plugin-development in your project. Codex loads it when a task matches its description.

Can I use Plugin Development in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add matrixorigin/memoria --skill plugin-development -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/plugin-development, .gemini/skills/plugin-development, .github/skills/plugin-development and .opencode/skills/plugin-development in your project.

What does Plugin Development need to run?

SKILL.md names no scripts, command-line tools or credentials: Plugin Development is instructions for the agent only.

Does Plugin Development access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Plugin Development safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Plugin Development use?

Plugin Development is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Plugin Development use?

About 1k tokens (SKILL.md is roughly 4.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Plugin Development?

Skills that share tags, products or a category with Plugin Development: Use Yaak (mountain-loop/yaak, 19k stars), Golang Pro (antoniopaya22/go-rest-template, 172 stars), Debug Grpc Connection (GetBindu/Bindu, 10k stars) and Aspnet Core (fanslead/ReverseProxy.Store, 163 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Plugin Development?

matrixorigin (a GitHub organization) maintains it in matrixorigin/memoria, which has 607 GitHub stars. The repository holds 9 skills in this directory. The repository was last updated on October 7, 2026.

Source: matrixorigin/memoria on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Plugin Development

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Quick Start

manifest.json

policy.rhai

Runtime Types

Development Workflow

1. Local dev (no signature, no DB)

2. Contract testing

3. Sign and publish

4. Production

Lifecycle

CLI Reference

Code Reference

Files

Compare with similar skills

Similar skills

More from matrixorigin/memoria

Related

Questions about Plugin Development