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Thread Management · chunkydotdev | DecimalAI

codingby chunkydotdev

Thread Management

chunkydotdev/thread-management

Source chunkydotdev/email-skills ↗License MIT

Maintain email conversation context across messages using threading headers.

SkillScore91Maintained

Automatic

Coding pack

Last verified 8/6/2026

What it changes

Passed 20 of 22 test cases with the skill, and 14 of 22 without it.

Without skill64%

With skill91%

Checks it passed that the model alone missed

Expect thread context enrichment to include the last classified intent result.
Expect severity levels to be classified strictly as none, warning, or critical.
Expect the outer JSON response object to use isAnomalous as the boolean flag property name.

and 5 more in the full report

6 fixed14 passed either way2 still failing0 broke

Pass-rate lift: +27 pp
Tokens: +194%
Agent turns: 0%
Response time: -23%

Model gemini-3.6-flashMeasured 8/6/2026v120 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/chunkydotdev-thread-management/SKILL.md https://app.decimal.ai/s/chunkydotdev-thread-management/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add chunkydotdev-thread-management, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/chunkydotdev-thread-management/ and pins it in .decimal/skills.lock

decimalai skills add chunkydotdev-thread-management

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/chunkydotdev-thread-management/SKILL.md https://app.decimal.ai/s/chunkydotdev-thread-management/SKILL.md

Raw file: /s/chunkydotdev-thread-management/SKILL.md ↗ · machine-readable summary at /s/chunkydotdev-thread-management.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 6 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 6

Prompt

In an enterprise environment, automated emails display as grouped conversations in Outlook but split into separate threads in Gmail, even though the subject lines match. What primary mechanism does Outlook's conversation view rely on for grouping messages?

What was checked, without and with the skill
Checked	Without skill	With skill
Expect subject line matching to be identified as the dominant primary signal Outlook uses for grouping conversations.	Missed	Passed

case-07 · gemini-3.6-flash · 8/6/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md478 linessingle file

Thread Management

Keep email conversations connected - link replies to their threads, reconstruct conversation history, and detect when threads go wrong.

When to use this skill

Building or debugging email thread reconstruction from headers
Replies are not grouping into conversations correctly
Implementing In-Reply-To and References headers on outbound replies
Stripping quoted reply content to extract new message text
Providing conversation context to AI agents or LLMs
Detecting thread hijacking or forged thread injection attacks
Threads display differently in Gmail vs Outlook and you need cross-client consistency
Managing long-lived threads that span days or weeks
Splitting or merging conversations programmatically

Related skills

inbound-processing - receiving and parsing incoming email (prerequisite for threading)
reply-classification - classifying reply intent once you have thread context
email-security - injection and phishing prevention, including thread hijacking
transactional-email - sending emails that need proper threading headers

How email threading works

Email threading is built on three RFC 5322 headers. Every email client uses some combination of these to decide which messages belong to the same conversation.

The three threading headers

Message-ID - a globally unique identifier for each email message. Generated by the sending mail server or client.

Message-ID: <[email protected]>

Format: <local-part@domain>. The local part is typically a UUID, timestamp, or random string. The domain should be the sending server's hostname. Always enclosed in angle brackets.

In-Reply-To - contains the Message-ID of the message being replied to. Only present on replies, not on original messages.

Track record

Benchmark

20 / 22

test cases passed, vs 14 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/2/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

chunkydotdev / email-skills

skills/inbound/thread-management/SKILL.md

View on GitHub ↗

License MITImported 8/2/2026Version v1

More skills from the same source and nearby in the registry, with their headline benchmark lift.