Fix email threads

[cooper-grc]

Summary by cubic

Fixes Gmail threading by adding proper In-Reply-To and References headers on replies and drafts using Message-ID values from the target thread, and sanitizes reply headers to prevent injection. Emails still send if header fetch fails.

• Bug Fixes
  • Added getThreadReplyHeaders to fetch Message-IDs from /threads/{id} and pass them to buildRawEmail.
  • Updated createDraft and sendEmail to include reply headers when thread_id is provided; graceful fallback on fetch errors.
  • Sanitized In-Reply-To and References in buildRawEmail; added tests for header inclusion, 404 fallback, and injection sanitization in pkg/tools/clients.

^{Written for commit 1e4a3d9. Summary will update on new commits.}

[github-actions]

✅ Integration Tests PASSED

Gateway: https://api.airstore.ai
Query path: /sources/gmail/unread-emails
Timestamp: 2026-04-01T01:39:34Z

I/O Smoke Tests

Test	Status	Latency	Bytes
list_sources	PASS	372ms	-
list_gmail	PASS	326ms	-
list_query_path	PASS	648ms	-
read_file	PASS	449ms	493
stat_file	PASS	302ms	6,898

Compression A/B Tests

Metric	Value
Files tested	10
Total raw bytes	75,219
Total strip bytes	48,466
Total raw tokens	42,483
Total strip tokens	28,269
Tokens saved	14,214
Byte reduction	35%
Token reduction	33%
Min threshold	10%
Cache consistent	Yes

Per-file results

File	Raw B	Strip B	Raw Tok	Strip Tok	Tok Saved	Red%	Raw ms	Strip ms
2026-03-31_eli_Laundromat_Use_Inquiry...	493	492	159	159	0	0%	318ms	292ms
2024-10-15_Harris-Walz_Organizing_Tea...	2,337	2,305	976	967	9	1%	417ms	310ms
2024-10-15_Stephen_King_via_KamalaHar...	2,904	2,866	1,116	1,103	13	1%	447ms	301ms
2026-04-01_VS_News_Network_Final_Remi...	1,693	1,644	595	580	15	2%	447ms	303ms
2025-07-17_KAYAK_How_to_have_everythi...	1,724	1,670	1,220	1,204	16	3%	455ms	322ms
2025-07-17_Alamo_Drafthouse_Cinema_Th...	19,047	18,224	12,228	11,704	524	4%	524ms	375ms
2025-07-17_Alamo_Drafthouse_Cinema_Th...	18,978	18,155	12,105	11,578	527	4%	521ms	419ms
2024-10-15_Knut_at_Sanity_Join_us_tom...	1,272	726	504	209	295	42%	449ms	303ms
2025-07-17_Lindsay_Stanley_TODAY_Conf...	1,876	1,049	657	268	389	44%	442ms	298ms
2025-07-17_NORDSTROM_RACK_FLASH_Travi...	24,895	1,335	12,923	497	12,426	94%	508ms	320ms

Charts

Overall Compression	Raw vs Compressed Bytes	Token Comparison
Reduction by File	Read Latency	I/O Latency

[cubic-dev-ai]

1 issue found across 3 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="pkg/tools/clients/gmail.go">

<violation number="1" location="pkg/tools/clients/gmail.go:498">
P2: Sanitize `In-Reply-To` and `References` before writing them into raw headers to prevent header injection via unexpected CR/LF characters.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review, or fix all with cubic.}