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deepseek-harness/docs/tool-execution-pipeline.md
Dudu-0223 8190016e2b feat(timeout): add tools/execute seam + tool-timeout policy plugin
Model-facing tool-call budgets were tangled into each capability's schema
(bash timeoutMs, web_fetch timeout_ms) with no shared home. Add a
tools/execute around-dispatch waterfall to dsh-tools whose base next() is
the dispatch-with-normalization thunk, and a new @deepseek-ai/dsh-timeout-policy
plugin (packages/timeout/) that arms a per-tool deadline on exec.signal and
returns a structured TOOL_TIMEOUT when it wins. Migrate web_fetch (drop the
model-facing timeout_ms) and web_search onto it; the fetch provider keeps its
timeout only as a resource backstop for direct callers. bash and hook command
execution keep BASH_TIMEOUT unchanged.

Named the plugin timeout-policy (not the RFC's tool-timeout) so it does not
trip the gen-tool-catalog packages/*/tool-* completeness guard, and replace
exec.signal by in-place mutation before next() since cordis waterfall next()
ignores passed arguments. RFC moved to implemented/ recording both deviations.
2026-07-08 10:10:37 +08:00

43 lines
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<!-- Generated by scripts/gen-doc-graphs.ts - do not edit by hand.
Run `pnpm run gen-doc-graphs` to regenerate. -->
# Tool Execution Pipeline
This graph shows where policy, hooks, sandboxing, filesystem guards, result rewriting, and UI rendering fit without changing the loop. The key extension points are the `tools/pre-execute`, `tools/execute`, and `tools/post-execute` waterfalls.
```mermaid
flowchart TD
model["Assistant message contains tool-call block"]
toolCall["Session event: <code>tool/call</code><br/>logged before execution"]
presentCall["UI pending card<br/>presentCall(args)"]
pre["<code>tools/pre-execute</code> waterfall<br/>hooks, permission, sandbox"]
denied["deny or ask<br/>tool body skipped"]
around["<code>tools/execute</code> waterfall<br/>timeout, retry, metrics (around dispatch)"]
toolBody["Registered tool execute() body"]
fsGate["<code>fs/write-intent</code> or <code>fs/edit-intent</code><br/>tool-fs mutations only"]
owned["Tool-owned session events<br/><code>todo/write</code>, <code>fs/observed</code>, <code>hook/invoked</code>, <code>hook/result</code>"]
post["<code>tools/post-execute</code> waterfall<br/>accept, block, replace, add context"]
context["Buffered additionalContext<br/>context/message after all tool results"]
toolResult["Session event: <code>tool/result</code><br/>single model-facing outcome"]
presentResult["UI completed card<br/>presentResult(args, result)"]
model --> toolCall
toolCall --> presentCall
toolCall --> pre
pre -->|allow| around
around --> toolBody
pre -->|deny or ask| denied
denied --> post
toolBody --> fsGate
fsGate --> toolBody
toolBody --> owned
toolBody --> around
around --> post
post --> context
post --> toolResult
toolResult --> presentResult
```
Filesystem read-before-edit checks live below `tool-fs` on the `fs/*` event gate; hook bridges and future permission prompts live on the generic pre/post tool waterfalls; and around-dispatch concerns like the tool-call timeout policy (`@deepseek-ai/dsh-timeout-policy`) wrap core dispatch on `tools/execute`. That split lets the same hooks observe bash, fs, web, todo, and subagent calls without coupling those tools to one policy service.
Maintenance mode: curated Mermaid flow; exact tool schemas and event signatures live in generated catalogs.