Merge remote-tracking branch 'origin/master' into codex/trim-ai-prose
# Conflicts: # docs/AGENTS.md # docs/config-catalog.md # packages/bash/bash-sandbox/src/index.ts # packages/bash/bash/src/session-mode.ts # packages/bash/tool-bash/README.md # packages/code-runtime/code-runtime-worker/README.md # packages/compact/compact/src/index.ts # packages/core/agent-core/README.md # packages/hooks/hooks-claude/src/config.ts # packages/hooks/hooks-claude/src/index.ts # packages/hooks/hooks-codex/src/config.ts # packages/hooks/hooks-codex/src/index.ts # packages/llm/llm/README.md # packages/session-persistence/session-persistence-jsonl/README.md # packages/session-persistence/session-persistence/README.md # packages/skill/skill-local/README.md # packages/support/acp-snapshot/README.md # packages/support/invariants/src/index.ts # packages/ui/acp/README.md # packages/ui/jsonrpc-agent/README.md # packages/ui/jsonrpc/README.md # packages/ui/permission/README.md # packages/ui/user-approval/README.md # packages/ui/user-interaction/README.md # packages/web/web-search-deepseek/README.md
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@@ -17,3 +17,22 @@ Spawn advertises `{ outputSchema: true, depthLimit: true, toolFilter: true, pers
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| Key | Meaning |
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|---|---|
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| `providerName` | Registry name on `ctx.subagents` (default `spawn`). |
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## Model Experience
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### Child-agent request
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**What the model sees**: The fresh child receives the standalone task content verbatim, inherits the parent model and workspace by default, and sees the global prompt with any configured child-scoped persona shadow. A tool filter removes global wire schemas, executable lookup, and Code Mode SDK bindings for that child but leaves independently registered guidance. It receives zero parent conversation messages; the filter is visibility/composition, not an authority grant inherited from the parent.
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**Token effect**: The child pays for a new independent context and history; no parent-history tokens are duplicated. Persona changes this child's repeated prompt cost, while filtering changes its schema or generated SDK cost.
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### Parent tool result, indirectly
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**What the model sees**: Through `dsh-tool-subagent`, the parent receives only the child's final output or stop-reason error.
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**Token effect**: Parent input grows by one data-dependent result retained until compaction.
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## Known Limitations and Deferred Work
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- **Runs expose no `sendMessage`/`resume`** — the optional runtime capabilities are absent on in-process runs.
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- **Fresh means no parent transcript** — the child inherits cwd, lineage, model, and explicitly configured persona/tool restrictions, but none of the parent's conversation; use the fork provider when completed-turn context is required.
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