oc-update-agent

oc-update-agent is a skill for Claude Code, Codex from sequenzia/agent-alchemy. It costs 62 tokens per session (1,257 once invoked), scanned A, original, MIT.

A workflow for bringing an existing OpenCode agent file up to date with current platform guidance. OpenCode is a tool for configuring coding agents.

In plain words
What is it for?
Use it to locate an agent, review its instructions, apply modernization changes, and validate the result. It can work from a file path or agent name.
Why use it?
It helps find outdated instructions or patterns in an agent and checks that the revised file is valid.

Skill for Claude CodeCodex

Installs and runs on its own, but its text points at files inside the plugin that ships it — anything it tells you to read at a ${CLAUDE_PLUGIN_ROOT} path is only there once the plugin is installed.

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/sequenzia/agent-alchemy/oc-update-agent
Any agent
npx skills add sequenzia/agent-alchemy --skill oc-update-agent
Clone the repo
git clone --depth 1 https://github.com/sequenzia/agent-alchemy

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for oc-update-agent

README.md
[![agentmods](https://agentmods.dev/badge/skills/sequenzia/agent-alchemy/oc-update-agent.svg)](https://agentmods.dev/skills/sequenzia/agent-alchemy/oc-update-agent)
Your own site
<a href="https://agentmods.dev/skills/sequenzia/agent-alchemy/oc-update-agent"><img src="https://agentmods.dev/badge/skills/sequenzia/agent-alchemy/oc-update-agent.svg" alt="Measured on agentmods" height="20"></a>
Per session 62 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,257 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00062 $0.01257
Opus 5 $0.00031 $0.00629
Sonnet 5 $0.00012 $0.00251
Haiku 4.5 $0.00006 $0.00126

Measured 4d ago against content hash e6a2dca9d4d8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

oc-update-agent scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

claude/opencode-tools/skills/oc-update-agent/SKILL.md · 180 lines

How it starts

The opening of the file, as written. The whole thing — 180 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Update OpenCode Agent

You are initiating the OpenCode agent update workflow. This process locates an existing agent, researches current platform best practices, analyzes the agent for outdated patterns, and applies updates with validation.

Critical Rules

AskUserQuestion is MANDATORY

IMPORTANT: You MUST use the AskUserQuestion tool for ALL questions to the user. Never ask questions through regular text output.


Phase 1: Load References

Read the OpenCode platform overview and agent guide:

  1. Read ${CLAUDE_PLUGIN_ROOT}/references/platform-overview.md
  2. Read ${CLAUDE_PLUGIN_ROOT}/references/agent-guide.md

Phase 2: Locate Agent

Find the agent to update.

If $ARGUMENTS is provided:

  1. Check if the argument is a file path — read it directly
  2. If it's an agent name — search for {name}.md in known directories

If no arguments:

  1. Search for OpenCode agents in the workspace:
    • Glob for .opencode/agents/*.md
    • Glob for ~/.config/opencode/agents/*.md
  2. Present found agents using AskUserQuestion:
    • Header: "Select Agent"
    • Question: "Which agent would you like to update?"
    • Options: List found agents (up to 4; include "Other" for custom path)

Read the selected agent file and store its contents.


Phase 3: Research

Spawn the researcher agent to check latest documentation:

Task:
  subagent_type: "agent-alchemy-opencode-tools:oc-researcher"
  prompt: |
    Research the latest OpenCode documentation for agent format compatibility.

    Artifact type: agent
    Current artifact content:
    ---
    {contents of the agent file}
    ---

    Specific questions:
    1. Are there any new agent frontmatter fields?
    2. Have permission syntax rules changed?
    3. Are there new agent modes or capabilities?
    4. Any changes to subagent behavior or limitations?

    Reference guide: ${CLAUDE_PLUGIN_ROOT}/references/agent-guide.md

Phase 4: Analyze

Compare the existing agent against current best practices:

Read the full file on GitHub · 180 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 4d ago First seen · 180 lines · 62 tokens per session scan A e6a2dca9d4d8

Subscribe to this mod's changes

oc-update-agent is a skill published in the GitHub repository sequenzia/agent-alchemy (43 stars, last pushed 3mo ago), licensed MIT. It adds 62 tokens to every session and 1,257 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.