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 infraspecdev/tesseract --skill devcontainergit clone --depth 1 https://github.com/infraspecdev/tesseractWrote 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/infraspecdev/tesseract/devcontainer)<a href="https://agentmods.dev/skills/infraspecdev/tesseract/devcontainer"><img src="https://agentmods.dev/badge/skills/infraspecdev/tesseract/devcontainer/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/infraspecdev/tesseract/devcontainer"><img src="https://agentmods.dev/badge/skills/infraspecdev/tesseract/devcontainer.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 | $0.00037 | $0.01262 |
| Opus 5.5 | $0.00015 | $0.00505 |
| Sonnet 5.5 | $0.00007 | $0.00252 |
| Haiku 4.5 | $0.00004 | $0.00126 |
Grade B, and why
devcontainer-init scanned grade B with 1 finding 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 1mo 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
`chmod 0755 .devcontainer/postCreate.sh .devcontainer/shield-firewall.sh`. How it starts
The opening of the file, as written. The whole thing — 142 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Devcontainer Init
Scaffold a per-repo .devcontainer/ that runs /implement and other agent commands in filesystem + network egress isolation. Follows the design at docs/superpowers/specs/2026-05-18-devcontainer-implement-design.md.
When to Use
- User runs
/shield init-devcontainer. - User asks to "set up a devcontainer" or "isolate /implement".
When NOT to Use
.devcontainer/already exists and matches what we'd produce → tell the user it's already set up.- User wants cloud / Codespaces / CI launchers → out of scope for v1; suggest local devcontainer first.
Step Skeleton
| Step | Action | Mandatory |
|---|---|---|
| 1 | Detect stacks via shield/scripts/detect_stack.py |
Yes |
| 2 | Confirm with user (add / drop / correct) | Yes |
| 3 | Compose devcontainer.json via shield/scripts/compose_devcontainer.py |
Yes |
| 4 | Copy templates: shield-firewall.sh, Dockerfile.tmpl, fill postCreate.sh.tmpl |
Yes |
| 5 | Diff against existing .devcontainer/ if present; prompt before overwrite |
Yes |
| 6 | Update .shield.json with devcontainer block |
Yes |
| 7 | Print next-step instructions (VS Code / CLI) | Yes |
Workflow
1. Detect
uv run python3 -c \
"from pathlib import Path; \
import sys; sys.path.insert(0, 'shield/scripts'); \
from detect_stack import detect_stack; \
print(' '.join(detect_stack(Path('.'))))"
Output is a space-separated list of stack tags (e.g., python node).
2. Confirm with user
Show the detected stacks. Ask:
Detected: python, node
[a] proceed with these
[b] drop one or more
[c] add a stack not detected
3. Compose devcontainer.json
uv run python3 -c \
"from pathlib import Path; \
import sys, json; \
sys.path.insert(0, 'shield/scripts'); \
from compose_devcontainer import compose_devcontainer; \
fm = Path('shield/skills/devcontainer/feature-map.json'); \
cfg = compose_devcontainer(stacks=['python', 'node'], feature_map_path=fm); \
print(json.dumps(cfg, indent=2))" > .devcontainer/devcontainer.json
What ships with it
6 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.
- 1mo ago First seen · 142 lines · 37 tokens per session scan B 9e7434a6910f
devcontainer-init is a skill published in the GitHub repository infraspecdev/tesseract (5 stars, last pushed 3mo ago), licensed MIT. It adds 37 tokens to every session and 1,262 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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