Build your own agent workspace where Claude Code and Codex share one database
A developer built his own agent harness workspace on top of Claude Code, Codex, OpenCode and Grok Build. All sessions share one SQLite database, work streams are Discord-style channels, and each agent has its own persona, memory, skills and scheduled jobs.
Source
@blakeurmos on X · 2026-10-14
Written in our own words. Credit to the original author. Link checked 2026-10-22.
What they did
A developer built his own agent harness workspace on top of Claude Code, Codex, OpenCode and Grok Build. All sessions share one SQLite database, work streams are Discord-style channels, and each agent has its own persona, memory, skills and scheduled jobs.
Result (as claimed)
One workspace for every agent, with shared history across tools.
Tools they used
Cost: Claude Code: from $17/mo; OpenAI Codex: free plan, paid from $8/mo.
Set it up
Pick a contained repo or task
Start on a branch or side project where mistakes are cheap.
Install and configure
Set up Claude Code, OpenAI Codex, OpenCode, SQLite. Read what it can run on your machine and limit permissions where possible.
Run it on a real task
Give it a well-scoped issue and let it work. Review the diff like any pull request.
Add guardrails
Keep tests and CI in the loop, and never let an agent push to main or touch production secrets unattended.
Copy the full setup prompt
Paste into your agent and it will walk you through the setup, asking before anything that sends, posts or spends.
You are helping me set up this AI use case end to end in Claude Code. Goal: Build your own agent workspace where Claude Code and Codex share one database What the original author did: A developer built his own agent harness workspace on top of Claude Code, Codex, OpenCode and Grok Build. All sessions share one SQLite database, work streams are Discord-style channels, and each agent has its own persona, memory, skills and scheduled jobs. Reported result (as claimed by the author): One workspace for every agent, with shared history across tools. Source: https://x.com/blakeurmos/status/2110469896413028685 Tools they used: Claude Code, OpenAI Codex, OpenCode, SQLite Category: Dev & ops Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
You are helping me set up this AI use case end to end in Codex. Goal: Build your own agent workspace where Claude Code and Codex share one database What the original author did: A developer built his own agent harness workspace on top of Claude Code, Codex, OpenCode and Grok Build. All sessions share one SQLite database, work streams are Discord-style channels, and each agent has its own persona, memory, skills and scheduled jobs. Reported result (as claimed by the author): One workspace for every agent, with shared history across tools. Source: https://x.com/blakeurmos/status/2110469896413028685 Tools they used: Claude Code, OpenAI Codex, OpenCode, SQLite Category: Dev & ops Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
You are helping me set up this AI use case end to end in Grok Bot. Goal: Build your own agent workspace where Claude Code and Codex share one database What the original author did: A developer built his own agent harness workspace on top of Claude Code, Codex, OpenCode and Grok Build. All sessions share one SQLite database, work streams are Discord-style channels, and each agent has its own persona, memory, skills and scheduled jobs. Reported result (as claimed by the author): One workspace for every agent, with shared history across tools. Source: https://x.com/blakeurmos/status/2110469896413028685 Tools they used: Claude Code, OpenAI Codex, OpenCode, SQLite Category: Dev & ops Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
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Guides for this use case
How to build your own coding agent or harness · How to vibe code an app with Claude Code · How to save, share and resume coding agent sessions · How to use Claude Code and Codex together
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