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feat(llm): structured error taxonomy with a shared HarnessError base (RFC 005 pt 2)

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Introduce HarnessError in dsh-llm (the leaf package): a stable machine-routable
code distinct from the message, cause chaining, name from the subclass, plus
isHarnessError. LlmError, ToolArgsError, and InvariantError now extend it.

Tool failures carry the structure end-to-end: ToolExecutionResult gains
error: { name, code } (populated from a thrown HarnessError), and the loop
forwards it onto the tool/result session event (which gained the same optional
field) for retry/sandbox plugins and replay. The loop's toError wraps non-Error
throws in a HarnessError(code: UNKNOWN, cause) instead of a bare Error.

Landed last and in isolation so it's a pure upgrade over the plain Error+code
the earlier PRs used — independently revertible. Graduates RFC 005 pt 2 ->
ADR 0015; RFC 005 now fully implemented.
This commit is contained in:
Tianyi Cui
2026-06-14 01:07:28 +08:00
parent 7a39616a06
commit 825b57aff9
18 changed files with 224 additions and 32 deletions
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docs/rfc/005-runtime-validation-and-error-taxonomy.md
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# RFC 005: Runtime validation at the model boundary, error taxonomy, dev-mode invariants
Status: partially implemented — part 1 (arg validation) → [ADR 0011](../adr/0011-runtime-arg-validation.md); part 3 (dev invariants) → [ADR 0012](../adr/0012-dev-invariants-over-deep-readonly.md); part 2 (error taxonomy) in progress
Status: implemented — part 1 (arg validation) → [ADR 0011](../adr/0011-runtime-arg-validation.md); part 3 (dev invariants) → [ADR 0012](../adr/0012-dev-invariants-over-deep-readonly.md); part 2 (error taxonomy) → [ADR 0015](../adr/0015-structured-error-taxonomy.md)
## Problem