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Replay Theater

Name: Replay Theater
Author: anthropic

v1.3.1🛡️Tier 1 Security AuditedCLI v2.1.287+ Verified

Deterministic session recorder and time-travel replay engine for debugging multi-turn agent execution trees.

@anthropic•★4,210 stars•↓18,900 active installs•MIT License

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⚡Installation Specifier

$/plugin install replay-theater@marketplace

Problem Solved & Architectural Motivation

Official Anthropic playground showcase mod. Records deterministic logs of prompt thoughts, executed tool invocations, shell stdio streams, and file diffs. Replay any Claude Code session offline with step-through scrubbing.

Before Execution

Zero-Time AST Interception

Evaluates tool payloads prior to kernel fork.

Scoring Model

0-100 Impact Index

Weighted heuristic scoring: files touched, git dirty state, env scope.

Non-Intrusive

Native CLI Hook

Zero proxy daemon required; hooks straight into Claude tool calls.

Lifecycle Architecture & Hook Flow

POSIX Event Engine

Step 01

Claude Plan

Prompt Inference

→

Step 02

Tool Call

tool.call Payload

→

HOOK INTERCEPT

replay-theater

<18ms Heuristic

→

Step 04

OS Execution

Kernel Fork

Manifest Schema (plugin.json)

{
  "name": "replay-theater",
  "version": "1.3.1"
}

Hook Implementation (register.js)

TypeScript SDK

export default function setup(mod) {
  mod.on('session.start', (ctx) => ctx.recorder.open(`.claude/replays/${ctx.sessionId}.replay`));
  mod.on('tool.dispatch', (ctx) => ctx.recorder.append({ tool: ctx.name, args: ctx.args }));
  mod.on('session.end', (ctx) => ctx.recorder.seal());
}

Security Audit99/100

Network EgressNone (Zero Socket Egress)

Filesystem ScopeBounded to Workspace

Credential Exposure0 Leaks Detected

Sandbox IsolationHost User Privilege