feat(zeph-core): intra-turn parallel tool dispatch via dependency DAG (LLMCompiler)#1712
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feat(zeph-core): intra-turn parallel tool dispatch via dependency DAG (LLMCompiler)#1712
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This was referenced Mar 13, 2026
… (LLMCompiler) Implements LLMCompiler-style parallel tool execution within a single agent turn. Independent tool calls now execute concurrently; calls that reference another call's tool_use_id as an argument value execute in topological tiers. - Add `crates/zeph-core/src/agent/tool_execution/tool_call_dag.rs`: `ToolCallDag` builds a dependency graph via Kahn's algorithm, partitions calls into tiers, detects cycles (falls back to full sequential execution with a warning) - Modify `handle_native_tool_calls` in `native.rs`: tier-based dispatch with per-tier `join_all`, cancel token propagation, `ToolStartEvent` per tier, TUI status messages for multi-tier batches, synthetic errors for dependents of failed/ConfirmationRequired prerequisite calls - Dependency detection uses exact whole-value matching (not substring) to avoid false positives with short Ollama-style integer IDs Closes #1646
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Summary
Implements LLMCompiler-style parallel tool execution within a single agent turn (issue #1646).
ToolCallDag(tool_call_dag.rs): builds a dependency graph fromtool_use_idreferences in tool arguments using Kahn's algorithm, partitions calls into topological tiers. Exact whole-value matching prevents false positives with short Ollama integer IDs.handle_native_tool_calls: calls in each tier execute concurrently viajoin_all; dependent calls wait for the previous tier; failed/ConfirmationRequired calls propagate a synthetic error to their dependents.warn!log entry."Executing tool tier N/M…"messages for multi-tier batches.Test plan
tool_call_dag.rscovering: trivial fast path, linear chain, diamond DAG, cycle fallback, Ollama short-ID no-false-positive, nested JSON traversal, self-reference, ConfirmationRequired propagationcargo nextest run --workspace --features full: 5359 passed (+327 vs main)cargo clippy --workspace --features full -- -D warnings: cleancargo +nightly fmt --check: cleanFollow-up issues (deferred from this PR)
ToolCallDagto avoid double scan (PERF-02, low)collect_stringsrecursion (PERF-03, low)ToolStartEventfor pre-failed dependent tools (M3, cosmetic)Closes #1646