C

Codex Subagent Playbook

shinsuke-kagawa/subagent-playbook · v0.3.2 · Development & Workflow

by Shinsuke Kagawareview

Routes subagent work using model and reasoning-effort defaults tuned through measured comparisons and daily Codex use: stronger models handle judgment-heavy research and review, lower-cost models execute well-specified plans, and Codex uses longer waits to avoid frequent polling, intervenes on stalls, and verifies results

InstallSourceClaim this pluginFollow0
Trust Score66Security71Surfaces1

Is Codex Subagent Playbook a fit?

From the plugin's manifest and HOL's scan. Anything the plugin does not declare is shown as not declared.

Works with

  • Codex
  • 1 skill

Before you install

Sign-in
Not declared
Declared access
Not declared
License
MIT

Check before relying on it

  • Security checks that did not finish: cisco-skill-scanner, codex-plugin-scanner. See the evidence
  • 2 medium findings from the scan. See the evidence
  • The publisher has not verified ownership on HOL.

What is Codex Subagent Playbook?

Codex Subagent Playbook is a published development & workflow plugin for AI coding agents in the codex ecosystem, developed by Shinsuke Kagawa and distributed through the HOL AI plugin registry. Routes subagent work using model and reasoning-effort defaults tuned through measured comparisons and daily Codex use: stronger models handle judgment-heavy research and review, lower-cost models execute well-specified plans, and Codex uses longer waits to avoid frequent polling, intervenes on stalls, and verifies results

Canonical slug
shinsuke-kagawa/subagent-playbook
Version
v0.3.2 · updated Oct 10, 2026

Trust & Reputation

HOL Trust Score
66

Factor Analysis

Per-metric points (0–100 each) combined via a weighted average into the overall score.

Installability
76pts
Maintenance
30pts
MCP Posture
100pts
Plugin Security
71pts
Provenance
70pts
Publisher Quality
75pts

Registry Snapshot

Publisher verification
No
Marketplace source
Unknown
Scanner
Broker fallback
Security result
Needs review
Digest verified
Yes
1 bundled skill — copy or download SKILL.mdOpen skills

Trust & reputation

Trust & Reputation

HOL Trust Score
66

Factor Analysis

Per-metric points (0–100 each) combined via a weighted average into the overall score.

Installability
76pts
Maintenance
30pts
MCP Posture
100pts
Plugin Security
71pts
Provenance
70pts
Publisher Quality
75pts

Provenance

Plugin root
.
Source repo
https://github.com/shinpr/codex-subagent-playbook
Source commit
91fe830d58ff…
Publisher verified
No
Owner verified
Not owner verified

Continuous scanner CI not detected

This plugin remains listed. Its overall trust score is reduced by 10% because security checks are not maintained in the source repository's CI.

Optional: maintain the scanner in the source repository's CI to receive the full trust score. Listing does not require that change.

README badge not detected

Plugin owners can add the HOL badge to the repository README from Guard Plugins. Distribution, not security evidence. It adds a 2% engagement adjustment to the overall trust score and never changes the security result.

Security Posture

See how the Trust Score is computed
Needs review
Security result
71
Security score
0
High findings
Provider
registry-broker-fallback
Grade
C · review
Version
Unknown
cisco-skill-scanner: unknown

Findings

mediumpublishabilitypublishability.link.missing.privacyPolicyURL

privacyPolicyURL should be present for marketplace readiness.

mediumpublishabilitypublishability.link.missing.termsOfServiceURL

termsOfServiceURL should be present for marketplace readiness.

lowoperational-securitysupply-chain.lockfile-missing

Repository snapshot does not include a lockfile.

infoskill-securityskill-scan.unavailable

Cisco skill scanner timed out after 60000 ms

Codex Subagent Playbook — Frequently asked questions

What is Codex Subagent Playbook?
Codex Subagent Playbook is an AI plugin in the HOL registry. Routes subagent work using model and reasoning-effort defaults tuned through measured comparisons and daily Codex use: stronger models handle judgment-heavy research and review, lower-cost models execute well-specified plans, and Codex uses longer waits to…
How do I install Codex Subagent Playbook?
Install Codex Subagent Playbook in your harness: Codex — codex plugin marketplace add shinpr/codex-subagent-playbook; Any agent — npx [email protected] add shinpr/codex-subagent-playbook. Full step-by-step guidance is on the HOL plugin page.
How do I install Codex Subagent Playbook in Codex?
To install Codex Subagent Playbook in Codex, start with codex plugin marketplace add shinpr/codex-subagent-playbook. The complete step-by-step install guide for Codex is on the HOL plugin page.
Is Codex Subagent Playbook free?
Pricing for Codex Subagent Playbook is published on its HOL plugin page when the maker schedules a launch.
How is the Trust Score for Codex Subagent Playbook computed?
Codex Subagent Playbook has a HOL Trust Score of 66 out of 100. The score is a weighted sum of six components from a static scan of the source, capped for high-severity findings and adjusted by two disclosed policies. Memberships and payments are not inputs, and a scan is not a safety guarantee. Full breakdown: https://hol.org/registry/plugins/shinsuke-kagawa%2Fsubagent-playbook/trust
Who publishes Codex Subagent Playbook?
Codex Subagent Playbook is published by Shinsuke Kagawa and listed on HOL.
Is Codex Subagent Playbook available now?
Codex Subagent Playbook availability is listed on its HOL plugin page.

Install Guidance

Install in Codex

Install through the Codex CLI plugin marketplace.

Codex plugin docs

Optional: install HOL Guard for Codex first, so it can check this plugin's tools on your machine before Codex uses them.

  1. 1

    Register the marketplace

    Run in any terminal. Codex reads the marketplace entry from .agents/plugins/marketplace.json (or the legacy .claude-plugin path) in the repository. If the repository ships none, add the generated entry from the Advanced section below first.

    shell
  2. 2

    Install from the Plugins browser

    Open Codex, open the Plugins browser, choose the marketplace registered by the previous command, and install subagent-playbook.

  3. 3

    Check the marketplace is registered

    This confirms the marketplace source only. Confirm the plugin itself is enabled in the Plugins browser before relying on it.

    shell

Did setup work in Codex?

No setup reports for Codex yet. Self-reported by signed-in visitors. Copying a command is not counted, and most installs are never reported.

Attested installs: Fewer than 10 attested installs of this plugin in week 2026-W43, so no number is shown. Counted from opt-in HOL Guard install reports, once per machine and runtime, and never mixed with the answers above. How install reports work.

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Plugin Manifest

{
  "name": "subagent-playbook",
  "version": "0.3.2",
  "description": "Opinionated Codex subagent model selection and delegation through completion.",
  "author": {
    "name": "Shinsuke Kagawa"
  },
  "homepage": "https://github.com/shinpr/codex-subagent-playbook",
  "keywords": [
    "codex",
    "subagents",
    "delegation",
    "model-selection"
  ],
  "skills": "./",
  "interface": {
    "displayName": "Subagent Playbook",
    "developerName": "Shinsuke Kagawa",
    "shortDescription": "Task-based model selection and completion delegation for Codex",
    "longDescription": "Choose models and reasoning effort for Codex subagents, then manage delegated work through verification.",
    "category": "Productivity",
    "capabilities": [
      "Select subagent models and reasoning effort",
      "Manage delegated work through verification"
    ],
    "websiteURL": "https://github.com/shinpr/codex-subagent-playbook"
  },
  "license": "MIT",
  "repository": "https://github.com/shinpr/codex-subagent-playbook",
  "holManifestOrigin": "repository",
  "registryIndexVersion": 5
}

Marketplace Source

Repo URL
https://github.com/shinpr/codex-subagent-playbook
Marketplace path
Unknown
Source path
.
Install policy
Unspecified

Skills

1 SKILL.md file ship with this plugin. Preview, copy, or download each one, then install them with the Skills CLI.

Share
skills-cli

  • subagent-delegation

    skills/subagent-delegation/SKILL.md

    Guides parents in subagent model selection and delegation through completion. Use when assigning work to subagents, assessing their progress or results, or intervening in delegated work.

    Raw SKILL.md

    SKILL.md content is not in this snapshot. Open the raw file to copy it from the source repository.

File Inventory

.codex-plugin/plugin.json

plugin-manifest

946 bytes

104385963efcb9de…

README.md

file

4,152 bytes

63f73977cb192881…

skills/subagent-delegation/SKILL.md

skill

5,946 bytes

1c5729be40c4e402…

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History, reviews, and alternatives

Launch history

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