# Aggregated Change Signal Return

> Collapse multiple change sources into one caller-facing boolean so headless bootstraps know whether a downstream refresh is necessary.

- **Type:** Skill
- **Install:** `agentstack add skill-ychampion-cskill-agents-aggregated-change-signal-return`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [ychampion](https://agentstack.voostack.com/s/ychampion)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [ychampion](https://github.com/ychampion)
- **Source:** https://github.com/ychampion/cskill-agents/tree/main/agents/claude-code/skills/aggregated-change-signal-return
- **Website:** https://x.com/YashasGunderia/status/2039990540016693692?s=20

## Install

```sh
agentstack add skill-ychampion-cskill-agents-aggregated-change-signal-return
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# SKILL: Aggregated Change Signal Return
**Domain:** extensions-mcp  
**Trigger:** Apply when a headless setup flow can change state through several mechanisms but callers only need one final answer about whether they must refresh downstream registries.
**Source Pattern:** Distilled from reviewed extension lifecycle and source-reconciliation patterns.

## Core Method
Aggregate every state-changing branch inside the headless install flow into one caller-facing signal. Seed registration, marketplace reconciliation, and delisting can each materially change the runtime even if the others do nothing, so the function should accumulate them into a single boolean that tells the caller whether a follow-up refresh is required. This keeps the internal branching detailed while exposing a minimal external contract.

## Key Rules
- Initialize the change signal from the earliest state-changing step instead of only from the main reconcile path.
- Fold every later state mutation into the same signal, even if it comes from cleanup or enforcement rather than install.
- Keep the caller contract narrow: one signal that means "refresh downstream state now," not a grab bag of internal counters.
- Update the signal only on genuine state changes so callers do not refresh on no-op runs.

## Example Application
If a headless extension bootstrap registers seeds, installs missing registries, and removes delisted plugins, return one `extensionsChanged` boolean that becomes true if any of those paths modified the effective plugin set. The caller can then refresh command discovery once, regardless of which branch caused the change.

## Anti-Patterns (What NOT to do)
- Do not expose only install counts when cleanup or seed registration can also require a downstream refresh.
- Do not make callers reconstruct change state from several independent metrics when the callee already knows the full picture.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [ychampion](https://github.com/ychampion)
- **Source:** [ychampion/cskill-agents](https://github.com/ychampion/cskill-agents)
- **License:** MIT
- **Homepage:** https://x.com/YashasGunderia/status/2039990540016693692?s=20

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-ychampion-cskill-agents-aggregated-change-signal-return
- Seller: https://agentstack.voostack.com/s/ychampion
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.