# Tool & Task Designs

Design choices in how Agenvoy loads tools, runs sub-agents, and resumes long tasks that were later adopted or confirmed elsewhere, with their dates and commits. Memory, sandbox, sign-in, and routing designs are in [Validated Designs](/docs/introduction-designs).

| Shipped in Agenvoy | Design | Same direction elsewhere |
| :--- | :--- | :--- |
| 2026-03-23 [script tool support with sandboxed execution](https://github.com/agenvoy/Agenvoy/commit/eb789ef4be)<br>2026-05-14 [script tool scaffolding skill](https://github.com/agenvoy/Agenvoy/commit/33a62c9161)<br>2026-06-05 [script tool runtime metadata](https://github.com/agenvoy/Agenvoy/commit/74ac5bf7eb) | Custom JS / Python tools run in the sandbox | 2026-09-29 [Pi 0.99.0 codemode: model-written JavaScript in a QuickJS sandbox](https://github.com/earendil-works/pi/blob/v0.99.0/packages/coding-agent/docs/cli.md#enable-codemode) |
| 2026-04-02 [deferred tool loading with search_tools](https://github.com/agenvoy/Agenvoy/commit/650711b764)<br>2026-05-05 [MCP client adapter with stdio/HTTP transports](https://github.com/agenvoy/Agenvoy/commit/bda9b15a08)<br>2026-06-07 [tool search registry](https://github.com/agenvoy/Agenvoy/commit/679d5544c7)<br>2026-08-08 [MCP OAuth flow](https://github.com/agenvoy/Agenvoy/commit/751e97c541) | Load tools on demand instead of declaring them all | 2026-09-29 [Pi 0.99.0 built-in MCP + tool_search](https://github.com/earendil-works/pi/blob/v0.99.0/packages/coding-agent/docs/mcp.md) |
| 2026-04-17 [invoke_subagent tool](https://github.com/agenvoy/Agenvoy/commit/db690a51d4)<br>2026-04-25 [session action logs](https://github.com/agenvoy/Agenvoy/commit/a78ae4e4c1)<br>2026-04-25 [session log streaming endpoint](https://github.com/agenvoy/Agenvoy/commit/78806be270)<br>2026-04-28 [subagent name dispatch](https://github.com/agenvoy/Agenvoy/commit/fb20bab34a) | Invoke sub-agents and track their logs | 2026-08-03 [Claude Code cross-session messaging](https://code.claude.com/docs/en/whats-new/2026-w32) |
| 2026-05-28 [extension tool loading](https://github.com/agenvoy/Agenvoy/commit/d92d37512b)<br>2026-05-28 [extension install and upload skills](https://github.com/agenvoy/Agenvoy/commit/4566ef49ae)<br>2026-05-29 [extension marketplace](https://github.com/agenvoy/Agenvoy/commit/ddc9b02903)<br>2026-06-08 [ext_ extension tools and scaffolding](https://github.com/agenvoy/Agenvoy/commit/2f2ba6e3ae) | Everything is a plugin | 2026-08-13 [DeepSeek Harness: everything is a plugin](https://www.deepseek.com/harness/en/) |
| 2026-06-03 [ask_user interruption async resume](https://github.com/agenvoy/Agenvoy/commit/137b322243)<br>2026-06-04 [preserve in-progress action memory across interruptions](https://github.com/agenvoy/Agenvoy/commit/a6b5e98f39)<br>2026-06-29 [pending task resume](https://github.com/agenvoy/Agenvoy/commit/757493e53b)<br>2026-07-03 [write_todo checklist flow](https://github.com/agenvoy/Agenvoy/commit/3b7c69cd05) | Resume long tasks from a checkpoint | 2026-08-04 [pi harness v2 in-memory storage](https://github.com/earendil-works/pi/commit/1d0c974713)<br>2026-08-05 [pi indexed harness recovery queries](https://github.com/earendil-works/pi/commit/591f22a618)<br>2026-08-05 [pi validate harness recovery record logs](https://github.com/earendil-works/pi/commit/a5953d2e15)<br>2026-08-05 [pi harness v2 jsonl backend](https://github.com/earendil-works/pi/commit/651d5d6a53)<br>2026-08-06 [pi atomic writes + torn-tail truncation](https://github.com/earendil-works/pi/commit/a838c069e6)<br>2026-08-14 [pi AgentHarness R3 generation recovery](https://github.com/earendil-works/pi/commit/a606448360)<br>2026-08-14 [pi AgentHarness R4 tool execution](https://github.com/earendil-works/pi/commit/d411d7b05e) |