Agentic Plugin Marketplace is a collection of reusable plugins, agents, skills, commands, and rules for coding-agent tools including Claude Code, Codex CLI, Cursor, OpenCode, Antigravity CLI, and GitHub Copilot. It is for developers assembling agentic workflows across multiple harnesses from shared Markdown sources, and the catalogue entries are examples or subsets of those workflow components.
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.
npx skills add wshobson/agents --skill parallel-feature-developmentgit clone --depth 1 https://github.com/wshobson/agentsWrote 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.
[](https://agentmods.dev/skills/wshobson/agents/parallel-feature-development)<a href="https://agentmods.dev/skills/wshobson/agents/parallel-feature-development"><img src="https://agentmods.dev/badge/skills/wshobson/agents/parallel-feature-development/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/wshobson/agents/parallel-feature-development"><img src="https://agentmods.dev/badge/skills/wshobson/agents/parallel-feature-development.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00105 | $0.01364 |
| Opus 5.5 | $0.00042 | $0.00546 |
| Sonnet 5.5 | $0.00021 | $0.00273 |
| Haiku 4.5 | $0.00011 | $0.00136 |
Grade A, and why
parallel-feature-development 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 1mo 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.
Copies of this mod
2 near-identical copies found in the catalogue:
- parallel-feature-development — 100% identical, 0 lines differ
- parallel-feature-development — 88% identical, 28 lines differ
How it starts
The opening of the file, as written. The whole thing — 175 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Parallel Feature Development
Strategies for decomposing features into parallel work streams, establishing file ownership boundaries, avoiding conflicts, and integrating results from multiple implementer agents.
When to Use This Skill
- Decomposing a feature for parallel implementation
- Establishing file ownership boundaries between agents
- Designing interface contracts between parallel work streams
- Choosing integration strategies (vertical slice vs horizontal layer)
- Managing branch and merge workflows for parallel development
File Ownership Strategies
By Directory
Assign each implementer ownership of specific directories:
implementer-1: src/components/auth/
implementer-2: src/api/auth/
implementer-3: tests/auth/
Best for: Well-organized codebases with clear directory boundaries.
By Module
Assign ownership of logical modules (which may span directories):
implementer-1: Authentication module (login, register, logout)
implementer-2: Authorization module (roles, permissions, guards)
Best for: Feature-oriented architectures, domain-driven design.
By Layer
Assign ownership of architectural layers:
implementer-1: UI layer (components, styles, layouts)
implementer-2: Business logic layer (services, validators)
implementer-3: Data layer (models, repositories, migrations)
Best for: Traditional MVC/layered architectures.
Conflict Avoidance Rules
The Cardinal Rule
One owner per file. No file should be assigned to multiple implementers.
When Files Must Be Shared
If a file genuinely needs changes from multiple implementers:
- Designate a single owner — One implementer owns the file
- Other implementers request changes — Message the owner with specific change requests
- Owner applies changes sequentially — Prevents merge conflicts
- Alternative: Extract interfaces — Create a separate interface file that the non-owner can import without modifying
Interface Contracts
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago First seen · 175 lines · 105 tokens per session scan A 9d39b7d0f301
parallel-feature-development is a skill published in the GitHub repository wshobson/agents (40,926 stars, last pushed yesterday), licensed MIT. It adds 105 tokens to every session and 1,364 once invoked, about $0.0004 per session on Opus 5.5. 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.
Other skills, from other repositories
principle-outcome-oriented-execution
Apply during planned rewrites and migrations with explicit phase boundaries. Converge on the target architecture; don't preserve smooth intermediate states with throwaway compatibility code.
account-plan
Create or update strategic account plan.
atlassian-setup
Connect Jira and Confluence for project tracking and knowledge search. Use when the user says 'connect Jira', 'hook up Confluence', 'my tickets/board'. Not for a personal task app like Todoist/Things/Trello; use todoist-setup/things-setup/trello-setup.
todoist-setup
Connect Todoist so Dex reads and updates your Todoist tasks two ways. Use when the user says 'I use Todoist', 'sync Todoist', or pastes a todoist.com link. Not for Things 3 (things-setup) or Trello (trello-setup); not for Jira tickets (atlassian-setup).
file-todos
This skill should be used when managing the file-based todo tracking system in the todos/ directory. It provides workflows for creating todos, managing status and dependencies, conducting triage, and integrating with slash commands and code review processes.
roadmap
Review roadmap status, evidence freshness, blockers, and alignment.