T3 Code is an app for controlling AI coding agents running on a user's computer through mobile, web, and desktop interfaces. Developers use it to work remotely with supported agents such as Codex, Claude Code, Cursor, Grok Build, OpenCode, and Antigravity. The catalogue add-ons support the T3 Code workflow.
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 pingdotgg/t3code --skill migration-guidancegit clone --depth 1 https://github.com/pingdotgg/t3codeWrote 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/pingdotgg/t3code/migration-guidance)<a href="https://agentmods.dev/skills/pingdotgg/t3code/migration-guidance"><img src="https://agentmods.dev/badge/skills/pingdotgg/t3code/migration-guidance/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/pingdotgg/t3code/migration-guidance"><img src="https://agentmods.dev/badge/skills/pingdotgg/t3code/migration-guidance.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00033 | $0.00234 |
| Opus 5.5 | $0.00013 | $0.00094 |
| Sonnet 5.5 | $0.00007 | $0.00047 |
| Haiku 4.5 | $0.00003 | $0.00023 |
Grade A, and why
migration-guidance 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 27d ago.
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.
Copies of this mod
4 near-identical copies found in the catalogue:
- migration-guidance — 100% identical, 0 lines differ
- migration-guidance — 100% identical, 0 lines differ
- migration-guidance — 100% identical, 0 lines differ
- migration-guidance — 100% identical, 0 lines differ
What it actually says
Update guidance when a v3 public module or API is renamed, moved, removed, replaced, or gains a materially different v4 contract. A v4-only API without a v3 counterpart does not automatically need an annotation.
- Account for every affected v3 symbol.
- Read annotations.md before adding or changing annotation YAML. Verify every suggested replacement against implementation and tests.
- When checking or regenerating the reference, or when the API change exists in a committed ref, read generation.md. Otherwise report that generation is deferred.
- When output was generated, inspect it for unrelated movement and stale refs.
The task is complete when every affected v3 symbol is accounted for, annotation replacements are verified, checks and generation succeed when the change is in a committed ref, and every generated difference is explained. Report deferred checks explicitly for uncommitted API changes.
What ships with it
2 files 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.
- 27d ago First seen · 22 lines · 33 tokens per session scan A 90976b6b5b39
migration-guidance is a skill published in the GitHub repository pingdotgg/t3code (27,790 stars, last pushed today), licensed MIT. It adds 33 tokens to every session and 234 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-09-19.
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