repl-scratchpad
Provides a persistent Python REPL for coding agents using a tmux-backed session so variables persist across turns. Agents write Python code to a temp file; only print() output is intended to be emitted back to the conversation context, while intermediate data stays in the REPL session.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Runs arbitrary Python code via an agent tool workflow. While the 'print-only' contract aims to prevent raw data from entering the chat context, it does not inherently prevent sensitive data from being accessed or printed by malicious/buggy code. No TLS/auth model applies because it appears to be local execution; isolation depends on tmux session handling, OS permissions, and how the skill scopes/cleans sessions. tmux session persistence increases risk of leftover sensitive state if not cleared.
⚡ Reliability
Best When
You run coding agents locally (or in a controlled environment) and want cross-turn state persistence while minimizing chat-context bloat via a print-only contract.
Avoid When
You cannot trust the execution environment or need strong separation of secrets/data between different users/sessions, or you need a network API/SaaS integration instead of local tooling.
Use Cases
- • Multi-step codebase analysis where intermediate results should persist across agent turns
- • Summarizing large datasets/files without streaming raw data back into the chat
- • Agent workflows that benefit from keeping computed state (variables, caches, indexes) between prompts
Not For
- • Web/API use cases requiring network services or remote execution
- • Security-sensitive workloads that require strict isolation between runs/users
- • Environments where tmux is unavailable or cannot be installed/configured
Interface
Authentication
No remote authentication described; it is intended to run locally as an agent skill. Security model is primarily the local execution environment and filesystem/process permissions.
Pricing
Open-source (MIT) repository per provided metadata; no pricing details for a hosted service.
Agent Metadata
Known Gotchas
- ⚠ Persistent state can lead to cross-turn contamination if sessions are not reset between tasks
- ⚠ Only print() output should be surfaced; models may accidentally emit other outputs if code prints/logs unexpectedly
- ⚠ Execution side effects (files, network calls) depend on what the agent code runs inside the REPL
Alternatives
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Scores are editorial opinions as of 2026-03-30.