crowdcast — Claude Code plugin: what it does, how to install
Runs local multi-agent simulations inside Claude Code to forecast public reactions or test creative storylines directly from uploaded documents.
/plugin marketplace add anthropics/claude-plugins-community
/plugin install crowdcast@claude-communityWhat crowdcast does
crowdcast turns text documents into interactive multi-agent environments. Supply an article or draft chapter alongside a target query, and the tool extracts key entities. It generates profiles with distinct viewpoints and begins multi-round discussions. Core personas reason separately, while crowd dynamics update in batches.
Execution relies on dedicated subagents for document review, persona drafting, simulation, and report compilation. Each step writes progress to JSON files inside .crowdcast/simulations/. If a run gets interrupted, the resume command recovers state from the last checkpoint.
Scale caps at roughly 100 agents due to context boundaries. It cannot handle massive populations like dedicated cluster engines, but it avoids Docker setups and paid third-party APIs. Everything executes within your standard Claude subscription.
What it helps with
- forecast audience reactions to policy or product announcements
- simulate multi-character story branches from rough narrative drafts
- interview simulated participants directly inside the terminal
- generate analytical prediction summaries from structured discussion logs
Example prompts for the agent
- /crowdcast simulate ./brief.pdf "How will small businesses react to these regulations?"
- /crowdcast simulate ./story.txt --mode=creative "Continue the scene after the breach"
- /crowdcast interview sim_a3f8b2c91d04 mayor_chen
How to install crowdcast
Plugin marketplace
/plugin marketplace add anthropics/claude-plugins-community/plugin install crowdcast@claude-communityStep by step, with commands for each platform: Claude Code plugins: marketplaces, installing, and building your own
Questions about crowdcast
How do I install crowdcast in Claude Code?
Add the marketplace and install the plugin using both steps: first run /plugin marketplace add anthropics/claude-plugins-community, then /plugin install crowdcast@claude-community.
What does crowdcast do?
It parses input files, initializes AI personas, and coordinates iterative discussions between them. The final result is either an analytical forecast report or an unfolding narrative chapter.
How does crowdcast compare to MiroFish?
crowdcast runs entirely inside Claude Code without local servers, Docker containers, or vector databases like Zep Cloud. Its practical limit is roughly 100 agents, while MiroFish is built for massive populations.
