- New ask_user core tool: mid-turn user question with option picking, refusing cleanly in autonomous mode, for background workers, and without a tty; system prompt points at it instead of prose questions. - Structural loop control for prompt-JSON CLI backends (opencode, grok, claude, codex, gemini): shared cli_json_turn repairs a missing JSON envelope exactly once, then accepts prose; prompt contract hardened against narrate-without-calling. - research/agentic-tool-loop-design: 74 sources plus 2 conclusions backing the loop-control decisions; INDEX updated to 6 subjects.
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yungkim/anthropiarch - docs/research/agentic_architecture/20260430_243b8f2b_agentic-architecture-subagents-tool-use-the-agentic-loop-anthropic-docs.md
Metadata
| Field | Value |
|---|---|
| Institute | Molodetz Institute — Research & Retrieval Division |
| Subject | agentic-tool-loop-design |
| Document type | Source Citation Card |
| Tier | 2 |
| Source title | yungkim/anthropiarch - docs/research/agentic_architecture/20260430_243b8f2b_agentic-architecture-subagents-tool-use-the-agentic-loop-anthropic-docs.md |
| Source URL | https://github.com/yungkim/anthropiarch/blob/HEAD/docs/research/agentic_architecture/20260430_243b8f2b_agentic-architecture-subagents-tool-use-the-agentic-loop-anthropic-docs.md |
| Source type | repository |
| Date researched | 2026-10-11 |
| Researched by | tai (agent), model: Muse Spark, on behalf of retoor |
| Research method | Search aggregator result listing (not independently opened or quoted) |
| Confidence | Not independently verified |
| Status | Active |
Why it's here
Surfaced by the stop_reason/agentic-loop search; looked relevant as research notes on the Anthropic agentic loop, parallel tool calls, and tool-description quality.
Changelog
| Date | Change |
|---|---|
| 2026-10-11 | Logged as consulted-but-not-analyzed. |