feat(core): JIT tool reference injection after pruning (#1740)#1771
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feat(core): JIT tool reference injection after pruning (#1740)#1771
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This was referenced Mar 14, 2026
When soft compaction prunes a tool output that has an existing overflow
file, preserve the path as a reference instead of losing it:
[tool output pruned; full content at {path}]
This lets the agent re-fetch the content via the read tool if needed,
rather than repeating the tool call blindly — matching the Manus /
Anthropic just-in-time retrieval pattern.
Changes:
- Add OVERFLOW_NOTICE_PREFIX constant shared between writer and extractor
- Add extract_overflow_ref() to parse overflow path from body text
- Apply JIT reference in all three pruning paths: hard compaction loop,
prune_tool_outputs, and prune_stale_tool_outputs
- Update flatten_parts() and debug_dump to render body-aware reference
- 8 new unit tests covering parser, pruning paths, and rendering
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Summary
Implements the just-in-time tool result retrieval pattern from Manus / Anthropic context engineering research (#1740).
When soft compaction prunes a stale tool output that already has an overflow file on disk, instead of silently clearing the body, the reference is preserved:
This allows the agent to re-fetch the content via the
readtool if needed, rather than repeating the original tool call blindly.Changes
tool_execution/mod.rs: AddOVERFLOW_NOTICE_PREFIXconstant shared between the overflow writer and the new extractor — eliminates magic string couplingcontext/summarization.rs: Addextract_overflow_ref()helper; apply JIT reference in all three pruning paths: hard compaction loop,prune_tool_outputs,prune_stale_tool_outputsprovider.rs: Updateflatten_parts()to render body-as-reference when body is non-empty on a compactedToolOutputdebug_dump.rs: Same body-aware rendering for consistencyTest plan
extract_overflow_ref()unit tests: happy path, absent notice, empty body, prefix-at-startcontext/mod.rs: all three paths produce[tool output pruned; full content at {path}]when overflow file present[pruned]/ empty bodyflatten_parts()rendering test: non-empty body on compactedToolOutputrenders referencecargo +nightly fmt --check✓cargo clippy --workspace --features full -- -D warnings✓cargo nextest run --config-file .github/nextest.toml --workspace --features full --lib --bins✓ (5551 tests, +8 new)Follow-up issues
debug_dump.rspart_to_json_value()ToolOutput branch is untested — needs dedicated testextract_overflow_ref()edge case: prefix present but EM-DASH delimiter absent — missing testrfindoverfindinextract_overflow_reffor hardening against crafted tool outputCloses #1740