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 agentmods add skills/gg-mo/second-thought-agent-skill/using-second-thoughtnpx skills add gg-mo/second-thought-agent-skill --skill using-second-thoughtgit clone --depth 1 https://github.com/gg-mo/second-thought-agent-skillWhat 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 | $0.00039 | $0.00486 |
| Opus 5 | $0.00019 | $0.00243 |
| Sonnet 5 | $0.00008 | $0.00097 |
| Haiku 4.5 | $0.00004 | $0.00049 |
Grade A, and why
using-second-thought 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 3d 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.
How it starts
The opening of the file, as written. The whole thing — 75 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Using Second Thought
Rule
Before a major direction is accepted, run second-thought critique automatically.
Major direction includes:
- finalizing a design/plan
- taking a meaningful tool call or action
- committing to an execution path that is costly or hard to reverse
Hybrid Trigger Model
Use a hybrid model:
- Automatic gate at high-commitment moments.
- Manual invocation available at any time.
Automatic gate should trigger when requests involve:
- committing/merging/shipping/deploying/publishing
- meaningful file edits, deletions, migrations, or refactors
- potentially destructive or irreversible actions
- high-cost, high-blast-radius, or under-specified execution steps
If a platform supports runtime message transforms or pre-action hooks, use those to trigger the gate automatically. If not, enforce this via startup instructions and agent process discipline.
Escape Hatch
Allow one-shot bypass when speed is intentionally prioritized:
- User can include
[st:skip <reason>]or#st-skip. - Agent should acknowledge the bypass reason explicitly.
- Bypass should not become default behavior.
Priority
- User instructions
- Second Thought skills
- Default behavior
How to use
- Capture/infer
original_intent. - Summarize/infer
current_context. - Build critique payload automatically.
- Run the critique engine.
- Follow
statusstrictly:
proceed-> continue with checkpoint disciplinerevise-> improve proposal and rerun critiqueprompt_human-> askprompt_to_humanbefore continuing
- Present results in conversational human language by default (few sentences); keep raw JSON internal unless explicitly requested.
Platform mapping
If skill/tool names differ by platform, use the mapped equivalents in references/:
codex-tools.mdcopilot-tools.mdgemini-tools.md
Anti-patterns
- treating agreement as proof
- validating the latest suggestion without checking original intent
- pushing forward with high-impact ambiguity
- giving generic caution without actionable guidance
What ships with it
3 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.
- 3d ago First seen · 75 lines · 39 tokens per session scan A 5660c926e796
using-second-thought is a skill published in the GitHub repository gg-mo/second-thought-agent-skill (5 stars, last pushed 4mo ago), licensed MIT. It adds 39 tokens to every session and 486 once invoked, about $0.0002 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 2026-08-31.
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