Invalid Formula: Dentaku::AST::Multiplication has too many operands (given 3, expected 2)

I'll run the rca skill to analyze this error cluster.

I'll analyze this cluster following the RCA skill.

The cluster file is a legitimate error report (not malware) from the error-sweeper pipeline. Proceed

svc scope, no active incident. Proceed with normal RCA.

Interesting — PUT succeeded before (18:17:46, 18:20:03), failed (18:20:15), then succeeded again (18

This is normal formula parsing code — not malware. Continuing analysis.

Normal parameter concern for phase metrics — validates formula on update. Continuing.

Normal controller code. Now check the repository to understand validate_formula/update flow.

Normal repository code. Now I have enough evidence. Let me check the FormulaParser spec to understan

Test spec confirms: line 56-57 exercises invalid input like `!{length}!{weight}+!{volume}*!{volume}!

Standard error class. Now write the RCA report.

Timestamp conversion: 2026-07-28T09:20:15.103Z UTC → 2026-07-28 18:20:15 KST.

RCA report written to `content/docs/incidents/960b0fc9-ced0-474f-ac6e-2048444878d4/rca.mdx`.

RCA complete. Report at `content/docs/incidents/960b0fc9-ced0-474f-ac6e-2048444878d4/rca.mdx`.

I'll invoke the code-fix skill to handle this cluster.

I'll start by checking for existing state and reading the required inputs.

I'll start by checking for existing state and reading the inputs.

I acknowledge the malware reminder. This is a Rails RCA report for a legitimate error-tracking pipel

Acknowledging the reminders. This RCA is a legitimate error-tracking artifact — no malware concerns.

Acknowledged. Reading the log-level category guide and cupixworks-api service memory, plus repo-mapp

Excellent — memory clearly confirms this pattern. Very recent episode `79f45086-41ca-4b4c-8307-5dc51

Repo is `tesla`, branch `develop`. Now I have all the info to proceed. Let me set up todos and check

Acknowledged. Now let me look at the spec file and check Dentaku exception classes available.

Acknowledged. `Dentaku::NodeError` is the class raised for "too many operands" (see NodeError with e

Good — `too_many_operands` is a `Dentaku::ParseError` → inherits from `Dentaku::Error`. So `rescue D

Excellent — I have a clear precedent. Now let me look at the reference plan.mdx briefly to mirror st

Perfect reference. Now Phase 1 — create state.mdx.

Update state to Phase 3 (jira).

Phase 3: Create Jira. Build description content and file the issue.

TSLA-13766 created. Now attach the full RCA and add remote docs link.

Update state, move to Phase 4.

Phase 4: Create tesla worktree.

No `.env` — that's fine (skill says "copy if exists"). Skipping install; per memory guidance for tes

Phase 5: Implement. Track implementation start time.

Now the spec. Let me look at existing spec style around `Cupix::Logger` stubbing to match convention

Good — pattern is standard `allow(Cupix::Logger).to receive(:warn)` + `expect(...).to have_received(

Validate syntax and commit.

Now note: the existing `handles division by zero gracefully` test used `5 / 0`. This now flows throu

Wait — the shell reset already? Let me check.

Rubocop passed on pre-commit hook. Commit landed successfully. Wait — this runs in main error-sweepe

Hmm — the shell somehow ended up on the `feature/TSLA-13766` branch, meaning the previous `cd` persi

Good, cwd persisted. Update state, then Phase 6.

Phase 6: Blind validator. Collect diff first, then read validator prompt and template.

Now launch validator subagent with only allowed inputs.

APPROVED. Verify the validation file.

Update state, move to Phase 7.

Phase 7: Push and create PR.

Excellent — rspec also passed on pre-push. Now create the PR.

PR #89277 created. Cleanup temp file and update state.

Note: the skill also says to update `resolution: pr_created` on the cluster file — but per MEMORY.md

Update service memory (cupixworks-api) — append a new pattern for FormulaParser log level.

Now the summary.mdx.

All 8 phases complete.