Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add sergebulaev/x-skills --skill x-thread-buildergit clone --depth 1 https://github.com/sergebulaev/x-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/sergebulaev/x-skills/x-thread-builder)<a href="https://agentmods.dev/skills/sergebulaev/x-skills/x-thread-builder"><img src="https://agentmods.dev/badge/skills/sergebulaev/x-skills/x-thread-builder.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00123 | $0.01671 |
| Opus 5 | $0.00062 | $0.00835 |
| Sonnet 5 | $0.00025 | $0.00334 |
| Haiku 4.5 | $0.00012 | $0.00167 |
Grade A, and why
x-thread-builder scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 128 lines — stays where its author put it; the contents beside it link to each section on GitHub.
X Thread Builder
Build tweetstorms that get read all the way down. On X, tweet 1 is the entire funnel: it has to promise a payoff and open a loop, or no one taps "Show this thread." Everything after only matters if tweet 1 earns the tap.
When to use
- User says "turn this into a thread" or "write me a thread about X"
- The idea is a list where each item needs teaching, a story with a build, a surprising result with a mechanism, or a repeatable process
- User has a single tweet that is trying to do too much and should be a thread
Formulas this skill uses (thread shapes)
| Code | Formula | Primary goal | Best for |
|---|---|---|---|
| X7 | Listicle-Thread Promise | bookmarks | numbered teaching thread, one item per tweet |
| X8 | Story Thread | likes, reposts | a real narrative with a build and a turn |
| X9 | Curiosity-Gap Opener | replies, bookmarks | a surprising result, mechanism withheld |
| X10 | How-I Teardown | bookmarks | a repeatable process you ran yourself |
Full skeletons in ../../references/hook-formulas.md. For single tweets
(X1-X6), use x-post-writer.
Pick by goal first
| Goal | Reach for |
|---|---|
| Bookmarks | X7, X10, X9 |
| Likes | X8 |
| Reposts | X8 |
| Replies | X9 |
How Publora splits a thread
Pass the full thread as one content string. Publora auto-splits it:
- at paragraph breaks (
\n\n) first, - then at sentence endings,
- then at word boundaries as a fallback,
- and adds
(1/N)markers, reserving ~8 chars per tweet for the marker.
For full control of where each tweet breaks, hand-split with a --- separator
on its own line between tweets. The skill defaults to hand-splitting with ---
so the user sees exactly how the thread will land before approving.
Steps
Voice profile first (all drafts). If ../../references/voice-profile.md has filled: yes, load it and match the user's voice fingerprint, hard rules, and CTA/link style throughout. If it is not filled, mention once that x-humanizer --mode profile can learn their voice from a few posts, then proceed with the generic voice rules.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- today Changed · +9 lines 05e89a313aca
- 7d ago First seen · 119 lines · 123 tokens per session scan A 0466cda68c06
x-thread-builder is a skill published in the GitHub repository sergebulaev/x-skills (57 stars, last pushed yesterday), licensed MIT. It adds 123 tokens to every session and 1,671 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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