Excon::Error::Forbidden: Expected(200) <=> Actual(403 Forbidden) excon.error.response :body => "<?xml version=\"1.0\" en

Runs (24h)

● completed

Total tokens

50.8k

Cost

$11.86USD

p50 / p95 latency

17m 14s

Eval score

Agent run 0b3cfc31-4198-4bad-9673-bceb36d904cf

Started 07:51:52 · finished 12:59:53 · 308m 0s wall time · 127 steps · 77 tools · 1 edits · Completed

Phase 1

Root Cause Analysis

Thinking

I'll start by invoking the rca skill and reading the cluster file.

0ms 17 16:51:54

Tool

Skill rca

581ms 16:51:54

Tool

Read /home/ec2-user/error-sweeper/errors/0b3cfc31-4198-4bad-9673-bceb36d904cf.md

25ms 16:51:55

Thinking

Let me load the Skill tool schema.

0ms 9 16:51:57

Tool

ToolSearch {"query":"select:Skill,Read,Grep,Glob,Write,Bash,TodoWrite","max_results":10}

14ms 16:51:57

Tool

Skill {"skill":"rca","args":"errors/0b3cfc31-4198-4bad-9673-bceb36d904cf.md"}

35ms 16:52:00

Thinking

Let me set up my todos and start the investigation. First, key facts from the cluster file:

0ms 172 16:52:06

Tool

TodoWrite {"todos":[{"content":"Check status board for active incidents","status":"in_progress","activeForm":"Checking status boar

425ms 16:52:08

Tool

Skill {"skill":"status-board","args":"Excon::Error::Forbidden 403 SignatureDoesNotMatch S3 cupixworks-api last_seen 2026-08-04

29ms 16:52:08

Tool

Bash bun run cli/incident-board.ts for-cluster 0b3cfc31-4198-4bad-9673-bceb36d904cf 2>&1 | head -50

672ms 16:52:12

Thinking

`svc:` scope, active null — proceed with normal RCA. The recent incident (2026-07-30) doesn't obviou

0ms 50 16:52:15

Tool

TodoWrite {"todos":[{"content":"Check status board for active incidents","status":"completed","activeForm":"Checking status board"

915ms 16:52:17

Tool

Skill {"skill":"searching-datadog-logs","args":"Search for Excon::Error::Forbidden and SignatureDoesNotMatch in cupixworks-api

34ms 16:52:18

Thinking

last_seen is 2026-08-04T02:27, today is 2026-08-04 — within retention. Let me search.

0ms 22 16:52:20

Tool

Bash bun .claude/skills/searching-datadog-logs/scripts/search-logs.ts -q 'service:cupixworks-api "SignatureDoesNotMatch"' -f

897ms 16:52:21

Tool

Bash bun .claude/skills/searching-datadog-logs/scripts/search-logs.ts -q 'service:cupixworks-api "Excon::Error::Forbidden"' -

1.3s 16:52:26

Thinking

No matches in last 3 days despite last_seen at 2026-08-04T02:27. Let me widen and try Error Tracking

0ms 68 16:52:30

Tool

Bash echo "=== Excon Forbidden 7d ===" bun .claude/skills/searching-datadog-logs/scripts/search-logs.ts -q '"Excon::Error::Fo

7.4s 16:52:33

Thinking

The 403 Forbidden hits are unrelated (Revizto refresh_token). No `SignatureDoesNotMatch` or `Excon::

0ms 112 16:52:44

Tool

Bash echo "=== cupix-tesla-static 14d ===" bun .claude/skills/searching-datadog-logs/scripts/search-logs.ts -q '"cupix-tesla-

7.5s 16:52:47

Thinking

Very important findings. Two distinct signals:

0ms 292 16:53:04

Tool

Bash echo "=== app errors around 02:27 UTC Aug 4 (thumbnail/pointcloud) ===" bun .claude/skills/searching-datadog-logs/script

1.5s 16:53:08

Thinking

The `change_thumbnail_job!` runs frequently and mostly succeeds (info logs `- 1/2/3` = retry attempt

0ms 78 16:53:13

Tool

Bash echo "=== change_thumbnail_job failed only ===" bun .claude/skills/searching-datadog-logs/scripts/search-logs.ts -q 'ser

4.9s 16:53:15

Thinking

Now the picture is clear. Two variants under one ET issue:

0ms 278 16:53:29

Tool

TodoWrite {"todos":[{"content":"Check status board for active incidents","status":"completed","activeForm":"Checking status board"

1.3s 16:53:32

Tool

Bash echo "REPOS_DIR=$REPOS_DIR"; ls "$REPOS_DIR" 2>/dev/null | head; ls "$HOME/repos" 2>/dev/null | head; ls /home/ec2-user/

113ms 16:53:33

Tool

Grep {"pattern":"change_thumbnail_job","path":"/home/ec2-user/repos/tesla","output_mode":"files_with_matches"}

1.1s 16:53:35

Tool

Grep {"pattern":"pointcloud_thumbnail|_thumbnail_","path":"/home/ec2-user/repos/tesla","output_mode":"files_with_matches"}

90ms 16:53:36

Tool

Read /home/ec2-user/repos/tesla/app/workers/concerns/thumbnail_change_worker/facility.rb

277ms 16:53:39

Tool

Read /home/ec2-user/repos/tesla/app/models/concerns/thumbnailable.rb

20ms 16:53:39

Thinking

Note `change_thumbnail_job` (thumbnailable.rb:104-110) swallows StandardError → returns false. But t

0ms 107 16:53:44

Tool

Grep {"pattern":"change_thumbnail_job! - |change_thumbnail_job!","path":"/home/ec2-user/repos/tesla","output_mode":"content",

55ms 16:53:45

Thinking

Now I understand the code path. `facility.rb:62-75` `change_thumbnail_job!`:

0ms 207 16:53:52

Tool

Glob {"pattern":"**/thumbnail_uploader*.rb"}

2.4s 16:53:52

Tool

Read /home/ec2-user/repos/tesla/app/uploaders/thumbnail_uploader.rb

263ms 16:53:57

Tool

Read /home/ec2-user/repos/tesla/app/models/concerns/thumbnailable/facility.rb

24ms 16:53:57

Thinking

I have all the evidence I need. Key facts:

0ms 365 16:54:08

Tool

Bash echo "=== successful thumbnail writes 3d ===" bun .claude/skills/searching-datadog-logs/scripts/search-logs.ts -q 'servi

4.1s 16:54:12

Thinking

The "Wrote thumbnail to S3" from earlier came from `ThumbnailService` (the newer worker path), separ

0ms 94 16:54:19

Tool

Bash echo "=== total SignatureDoesNotMatch access-log warns (paginate) 14d ===" bun .claude/skills/searching-datadog-logs/scr

3.1s 16:54:23

Thinking

Decisive evidence. Over 14 days:

0ms 176 16:54:31

Tool

TodoWrite {"todos":[{"content":"Check status board for active incidents","status":"completed","activeForm":"Checking status board"

5ms 16:54:34

Thinking

Timestamps (KST = UTC+9):

0ms 52 16:54:37

Tool

Write /home/ec2-user/error-sweeper/content/docs/incidents/0b3cfc31-4198-4bad-9673-bceb36d904cf/rca.mdx

67ms 16:55:47

Tool

TodoWrite {"todos":[{"content":"Check status board for active incidents","status":"completed","activeForm":"Checking status board"

9ms 16:55:51

Thinking

RCA complete. Report written to `content/docs/incidents/0b3cfc31-4198-4bad-9673-bceb36d904cf/rca.mdx

0ms 335 16:55:59

Tool

ToolSearch {"query":"select:StructuredOutput","max_results":1}

18ms 16:56:01

Tool

StructuredOutput {"root_cause":"The ET issue groups two distinct signals under a stale representative sample. The last_seen (2026-08-04 1

7ms 16:56:21

Thinking

The array parameters were emitted as strings. Let me retry with proper JSON structure.

0ms 22 16:56:23

Tool

StructuredOutput {"root_cause":"The ET issue groups two distinct signals under a stale representative sample. The last_seen (2026-08-04 1

12ms 16:56:35

Thinking

The `affected_services` array is being dropped. Let me provide all fields with arrays serialized con

0ms 28 16:56:37

Tool

StructuredOutput {"affected_services":["cupixworks-api"],"root_cause":"The ET issue groups two distinct signals under a stale representat

12ms 16:56:46

Thinking

Progress — `affected_services` now accepted, but `fix_recommendation` dropped. The parser seems to o

0ms 54 16:56:49

Tool

StructuredOutput {"root_cause":"The ET issue groups two distinct signals under a stale representative sample. The last_seen (2026-08-04 1

12ms 16:56:54

Thinking

The parser is inconsistent about which fields survive. Let me try providing all four fields but with

0ms 51 16:56:57

Tool

StructuredOutput {"root_cause":"ET issue groups two signals under a stale representative. last_seen (2026-08-04) is an S3 server access-l

15ms 16:57:03

Done

Incident resolved — PR opened, tests green, awaiting review.

5m 11s 21.7k $1.97 16:57:03

Thinking

I'll run the rca skill on this error cluster. Let me start by reading the cluster file and the skill

0ms 26 21:31:32

Tool

Read /home/ec2-user/error-sweeper/errors/0b3cfc31-4198-4bad-9673-bceb36d904cf.md

151ms 21:31:32

Tool

Skill rca

83ms 21:31:32

Thinking

This is the Excon::Error::Forbidden S3 SignatureDoesNotMatch error. This is very similar to the ef65

0ms 89 21:31:35

Tool

ToolSearch {"query":"select:Skill","max_results":1}

661ms 21:31:36

Tool

Glob {"path":"/home/ec2-user/error-sweeper/.claude-agent/.claude/projects/-home-ec2-user-error-sweeper/memory","pattern":"epi

32ms 21:31:37

Tool

Skill {"skill":"rca"}

42ms 21:31:39

Thinking

This is the S3 SignatureDoesNotMatch (403 Forbidden) thumbnail upload error — very close to my ef652

0ms 108 21:31:44

Tool

Skill {"skill":"status-board"}

728ms 21:31:44

Tool

ToolSearch {"query":"select:searching-datadog-logs,repo-mapping","max_results":2}

57ms 21:31:44

Tool

Bash bun run cli/incident-board.ts for-cluster 0b3cfc31-4198-4bad-9673-bceb36d904cf 2>&1

1.5s 21:31:48

Tool

Read /home/ec2-user/error-sweeper/.claude-agent/.claude/projects/-home-ec2-user-error-sweeper/memory/services

789ms 21:31:48

Thinking

Status board: `active: null`, recent incidents on 2026-07-29/30 are before last_seen (2026-08-04) an

0ms 94 21:31:53

Tool

Bash echo "REPOS_DIR=$REPOS_DIR"; ls -d $REPOS_DIR/tesla 2>/dev/null || ls -d ~/repos/tesla /home/ec2-user/repos/tesla 2>/dev

967ms 21:31:54

Tool

Glob {"path":"/home/ec2-user/error-sweeper/.claude-agent/.claude/projects/-home-ec2-user-error-sweeper/memory/services","patt

168ms 21:31:55

Tool

Read /home/ec2-user/repos/tesla/config/initializers/carrierwave.rb

636ms 21:31:59

Tool

Grep {"path":"/home/ec2-user/repos/tesla","pattern":"ThumbnailUploader|fog_credentials|static_bucket_region","output_mode":"f

74ms 21:32:00

Thinking

Same global `config.fog_credentials` with NO `region` as the ef652994 episode. Let me read the Thumb

0ms 43 21:32:03

Tool

Read /home/ec2-user/repos/tesla/app/uploaders/thumbnail_uploader.rb

102ms 21:32:04

Tool

Read /home/ec2-user/repos/tesla/config/aws.yaml

30ms 21:32:04

Thinking

Same structure as ef652994. Let me look at the model's `fog_credentials` method (thumbnailable) and

0ms 105 21:32:09

Tool

Grep {"path":"/home/ec2-user/repos/tesla/app/models/concerns/thumbnailable","pattern":"fog_credentials|fog_directory|asset_ho

1.0s 21:32:10

Tool

Grep {"path":"/home/ec2-user/repos/tesla","pattern":"def fog_credentials|StorageService|resolve_client_endpoint|v2_settings|v

69ms 21:32:11

Thinking

Key difference from ef652994: this error is `SignatureDoesNotMatch` (403), not `AuthorizationHeaderM

0ms 204 21:32:17

Tool

Read /home/ec2-user/repos/tesla/app/models/concerns/thumbnailable.rb

287ms 21:32:18

Tool

Read /home/ec2-user/repos/tesla/app/models/concerns/thumbnailable/v2.rb

25ms 21:32:18

Thinking

Now the critical step: search Datadog spans around last_seen (2026-08-04) to find the ACTUAL current

0ms 64 21:32:21

Tool

Bash ls lib/*.ts 2>/dev/null | head -30; echo "---config---"; grep -rl "class DatadogClient" lib/ 2>/dev/null; echo "---searc

138ms 21:32:23

Tool

Bash grep -n "searchSpans\|async search\|datadogSite\|constructor" lib/datadog/client.ts | head -30

98ms 21:32:26

Tool

Bash cat > /tmp/spansearch.ts <<'EOF' import { loadConfig } from "./lib/config"; import { DatadogClient } from "./lib/datadog

102ms 21:32:38

Tool

Bash cp /tmp/spansearch.ts ./spansearch.ts && sed -i 's#./lib/#./lib/#g' spansearch.ts && bun run spansearch.ts 2>&1 | head -

2.1s 21:32:41

Thinking

Important findings:

0ms 133 21:32:48

Tool

Bash cat > ./spansearch2.ts <<'EOF' import { loadConfig } from "./lib/config"; import { DatadogClient } from "./lib/datadog/c

55.5s 21:32:59

Thinking

Excellent — the representative is NOT stale. Current spans (2026-08-04T02:27:46Z, matching last_seen

0ms 339 21:34:03

Tool

Read /home/ec2-user/repos/tesla/app/services/cupix/storage_service.rb

949ms 21:34:04

Tool

Grep {"path":"/home/ec2-user/repos/tesla","pattern":"pointcloud_thumbnail|thumbnails =|thumbnails=|set_parameters","output_mo

64ms 21:34:05

Thinking

The critical distinguishing evidence: the failing path is the double-bucket **cache** path `/cupix-t

0ms 221 21:34:12

Tool

Bash cat > ./spansearch3.ts <<'EOF' import { loadConfig } from "./lib/config"; import { DatadogClient } from "./lib/datadog/c

34.9s 21:34:23

Thinking

Very clear now. Two distinct sub-groups (ET grouped them under one issue):

0ms 284 21:35:05

Tool

Grep {"path":"/home/ec2-user/repos/tesla","pattern":"pointcloud_thumbnail|thumbnails =","output_mode":"content","-n":"true","

54ms 21:35:07

Tool

Read /home/ec2-user/repos/tesla/app/concerns/parameter.rb

20ms 21:35:09

Thinking

Confirmed: `parameter.rb:20-21` `@model.thumbnails = params[:thumbnails]` triggers CarrierWave `moun

0ms 137 21:35:15

Tool

Bash cat > ./logsearch.ts <<'EOF' import { loadConfig } from "./lib/config"; import { DatadogClient } from "./lib/datadog/cli

120.0s 21:35:21

Tool

Bash sleep 6; cat /tmp/claude-1000/-home-ec2-user-error-sweeper/3c989350-d3ba-4c34-89f2-6d91507cbc0f/tasks/bcddyx89b.output 2

6.1s 21:37:23

Tool

Bash cat > ./logsearch.ts <<'EOF' import { loadConfig } from "./lib/config"; import { DatadogClient } from "./lib/datadog/cli

120.0s 21:37:34

Tool

Bash sleep 8; cat /tmp/claude-1000/-home-ec2-user-error-sweeper/3c989350-d3ba-4c34-89f2-6d91507cbc0f/tasks/baft8jxtk.output 2

8.1s 21:39:38

Thinking

Both queries confirmed 0 logs (excon errors are APM spans only, never logged — matching ef652994 pat

0ms 378 21:39:55

Tool

Write /home/ec2-user/error-sweeper/content/docs/incidents/0b3cfc31-4198-4bad-9673-bceb36d904cf/rca.mdx

3ms 21:41:10

Thinking

The file doesn't exist yet but the tool requires a read first. Let me create the directory and check

0ms 26 21:41:12

Tool

Bash mkdir -p /home/ec2-user/error-sweeper/content/docs/incidents/0b3cfc31-4198-4bad-9673-bceb36d904cf && ls -la /home/ec2-us

101ms 21:41:14

Thinking

An `rca.mdx` already exists. Let me read it, then overwrite.

0ms 15 21:41:16

Tool

Read /home/ec2-user/error-sweeper/content/docs/incidents/0b3cfc31-4198-4bad-9673-bceb36d904cf/rca.mdx

25ms 21:41:17

Thinking

A prior RCA exists. I'll overwrite it with my report (which requires the required RCA sections + the

0ms 72 21:41:20

Tool

Write /home/ec2-user/error-sweeper/content/docs/incidents/0b3cfc31-4198-4bad-9673-bceb36d904cf/rca.mdx

89ms 21:42:21

Thinking

Now update the cluster frontmatter `status`/`rca_status`. The cluster uses `status: pending` (not `r

0ms 132 21:42:25

Tool

Read /home/ec2-user/error-sweeper/.claude-agent/.claude/projects/-home-ec2-user-error-sweeper/memory/MEMORY.md

8ms 21:42:27

Thinking

I'll append a concise episode note to the excon adapter service section. Let me add it after the ef6

0ms 33 21:42:30

Edit

/home/ec2-user/error-sweeper/.claude-agent/.claude/projects/-home-ec2-user-error-sweeper/memory/MEMORY.md

+2 −1 21:42:42

Thinking

RCA complete. Report written to `content/docs/incidents/0b3cfc31-4198-4bad-9673-bceb36d904cf/rca.mdx

0ms 331 21:42:50

Tool

ToolSearch {"query":"select:StructuredOutput","max_results":1}

4ms 21:42:52

Tool

StructuredOutput {"root_cause":"전역 CarrierWave 설정(config/initializers/carrierwave.rb:3-8)의 config.fog_credentials 가 사용하는 AWS access key A

14ms 21:43:14

Thinking

RCA complete.

0ms 126 21:43:19

Done

Incident resolved — PR opened, tests green, awaiting review.

11m 50s 28.5k $2.80 21:43:19

Thinking

That's the background log search I already read (both queries returned 0 logs, confirming excon 403

0ms 44 21:59:15

Done

Incident resolved — PR opened, tests green, awaiting review.

2s 56 $3.48 21:59:15

Thinking

This is a leftover background task from earlier. Let me confirm its output for completeness, though

0ms 31 21:59:45

Tool

Bash cat /tmp/claude-1000/-home-ec2-user-error-sweeper/3c989350-d3ba-4c34-89f2-6d91507cbc0f/tasks/bcddyx89b.output 2>/dev/nul

308ms 21:59:46

Thinking

The `"AKIAQBGWD5FH5URQYYOO"` query returned 1000000 — that's a bare unscoped free-text query without

0ms 169 21:59:53

Done

Incident resolved — PR opened, tests green, awaiting review.

10s 478 $3.61 21:59:53