What is subagent-harness-mcp-phase0a-control?

A static control for whether a plugin is visible during phase 0a of the Subagent Harness. A plugin is an add-on that gives an agent extra tools or instructions.

Controlling which plugins are shown in the Subagent Harness during phase 0a.

The description does not specify any behaviour beyond controlling plugin visibility.

subagent-harness-mcp-phase0a-control

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.

Claude Code

/plugin marketplace add Thang1710/subagent-mcp

agentmods

npx agentmods add plugins/thang1710/subagent-mcp/control-plugin

Clone the repo

git clone --depth 1 https://github.com/Thang1710/subagent-mcp

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

subagent-harness-mcp-phase0a-control 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 yesterday.

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.

tests/fixtures/phase0a/control-plugin/.claude-plugin/plugin.json · 6 lines

What it actually says

{
  "name": "subagent-harness-mcp-phase0a-control",
  "version": "0.0.0",
  "description": "Static Phase 0a plugin visibility control."
}

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.

yesterday First seen · 6 lines scan A 977d07a7c37c

Subscribe to this mod's changes

subagent-harness-mcp-phase0a-control is a plugin published in the GitHub repository Thang1710/subagent-mcp (0 stars, last pushed yesterday), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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 2026-08-31.

Building agents Testing agent-orchestration ai-agents claude-code codex coding-agent developer-tools

david-skills

David's built-in skills — create-agent, create-job, create-dashboard — bundled with the David VS Code extension and auto-loaded into every David-spawned agent's Claude Code session via --plugin-dir.

edwardyen724-g/david-vscode · not measured

hookify

Easily create hooks to prevent unwanted behaviors by analyzing conversation patterns.

neuradex/sna · not measured

coaltipple

CoalTipple — model/effort router for Claude Code. Delegates a task you CAN do but is large+cheap DOWN to a lower tier to save tokens; escalates a task beyond the current tier UP for quality — up to Fable 5, the top rung (a consent-gated, real-money spawn). Two-knob routing (tier × effort, effort-before-tier), an alias.

TheColliery/CoalTipple · not measured

subagent-harness-mcp-phase0a-control

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

Other plugins, from other repositories

david-skills

hookify

coaltipple

agent-dashboard

refactoring-legacy

nextjs