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feat(spill): add tool-output spill seam, local backend, and policy

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Oversized plain-text tool results now spill to a session-scoped file and
return a bounded preview plus the spill path, so a verbose result stays
readable via `read` without consuming the next model request in full.

- dsh-spill: minimal SpillFiles seam (saveText → session-scoped SpillPath)
- dsh-spill-local: private 0700 session dirs, traversal-safe names, exclusive
  owner-only writes
- dsh-spill-policy: tools/post-execute transformer; no-op unless maxInlineBytes
  is set; skips read; best-effort on save failure (never turns a success into
  an isError)

web_fetch is the showcase — no tool-specific spill code. The coding-agent
example loads the stack so its keyless Loader smoke guards the namespace-plugin
export shape. Snapshot gap for a transcript-visible web_fetch spill is recorded
in the RFC's Consequences (ACP replay is keyless and cannot hit the web).
This commit is contained in:
Dudu-0223
2026-07-08 19:20:50 +08:00
parent 4f2f34c6fd
commit 463b72ce96
36 changed files with 1549 additions and 1 deletions
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8
docs/capability-seams.md
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@@ -60,6 +60,10 @@ flowchart LR
pkg_web_search_perplexity["web-search-perplexity"]
pkg_web_search_deepseek["web-search-deepseek"]
pkg_web_fetch_local["web-fetch-local"]
pkg_spill["spill"]
svc_spillFiles["ctx.spillFiles<br/>Spill storage seam"]
pkg_spill_local["spill-local"]
pkg_spill_policy["spill-policy"]
pkg_agent --> svc_agents
pkg_agent_loop --> svc_agentLoop
pkg_bash --> svc_bash
@@ -76,6 +80,8 @@ flowchart LR
pkg_session_persistence --> svc_sessionPersistence
pkg_session_persistence_jsonl --> svc_sessionPersistence
pkg_session_persistence_sqlite --> svc_sessionPersistence
pkg_spill --> svc_spillFiles
pkg_spill_local --> svc_spillFiles
pkg_subagent --> svc_subagents
pkg_subagent_acp --> svc_subagents
pkg_subagent_fork --> svc_subagents
@@ -108,6 +114,7 @@ flowchart LR
svc_sessions --> pkg_invariants
svc_sessions --> pkg_session_persistence
svc_sessions --> pkg_subagent_inprocess
svc_spillFiles --> pkg_spill_policy
svc_subagents --> pkg_tool_subagent
svc_systemPrompt --> pkg_agent_loop
svc_systemPrompt --> pkg_tool_fs
@@ -138,5 +145,6 @@ flowchart LR
| `ctx.compact` | `seam` | [`compact`](../packages/compact/compact) | [`compact-basic`](../packages/compact/compact-basic) | [`compact-basic`](../packages/compact/compact-basic) | - | The basic backend currently consumes the pre-step event directly; a model-facing compact tool remains deferred. |
| `ctx.subagents` | `seam` | [`subagent`](../packages/subagent/subagent) | [`subagent-spawn`](../packages/subagent/subagent-spawn), [`subagent-fork`](../packages/subagent/subagent-fork), [`subagent-acp`](../packages/subagent/subagent-acp), [`subagent-mock`](../packages/support/subagent-mock) | [`tool-subagent`](../packages/subagent/tool-subagent) | - | Providers implement transports; tool-subagent exposes one configured provider as a model-facing tool name. |
| `ctx.web` | `seam` | [`web`](../packages/web/web) | [`web-search-exa`](../packages/web/web-search-exa), [`web-search-perplexity`](../packages/web/web-search-perplexity), [`web-search-deepseek`](../packages/web/web-search-deepseek), [`web-fetch-local`](../packages/web/web-fetch-local) | [`tool-web`](../packages/web/tool-web) | - | Search and fetch providers register into one ctx.web seam; tool-web owns the stable model-facing names. |
| `ctx.spillFiles` | `seam` | [`spill`](../packages/spill/spill) | [`spill-local`](../packages/spill/spill-local) | [`spill-policy`](../packages/spill/spill-policy) | - | The backend saves oversized tool text to a session-scoped path; spill-policy is the tools/post-execute consumer that decides when to spill. |
Maintenance mode: hybrid: services are discovered from Cordis declarations; interface/implementation/consumer roles are classified in `scripts/gen-doc-graphs.ts` with a completeness guard.