Developer Sandbox

What it does

When your agent uses it

• Tasks that involve Embeddings

Example prompts

• “/developer-sandbox”

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

1. 1Show core value in 30 seconds
2. 2Solve real problems developers have
3. 3Demonstrate differentiation from competitors
4. 4Scale in complexity from simple to advanced

What it can do on your machine

Read from SKILL.md and the folder at commit 1e53ce2. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are javascript).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Developer Sandbox loads about 910 tokens when it runs, and up to ~4.5k if it reads all its reference files. Until then it costs about 68 tokens; SKILL.md has 309 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~68

When it runs · the whole SKILL.md, loaded when a task matches

~910

With references · SKILL.md plus every file in references/, read only if the agent opens them

~4.5k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from sickn33/agentic-awesome-skills at commit 1e53ce2, republished under its MIT licence (© sickn33). 309 words, ~910 tokens.

name

developer-sandbox

description

Design and build interactive playgrounds that let developers experience your product without commitment. This skill covers playground architecture, pre-populated examples, embedding strategies, gating decisions, and converting playground users to signups.

risk

critical

source

https://github.com/jonathimer/devmarketing-skills/tree/main/skills/developer-sandbox

source_repo

jonathimer/devmarketing-skills

source_type

community

date_added

2026-07-01

license

MIT

license_source

https://github.com/jonathimer/devmarketing-skills/blob/main/LICENSE

// Example: Text Analysis API
const result = await api.analyze("Hello, world!");
// Output: { words: 2, characters: 13 }

// Example: Shows AI doing something impressive
const result = await api.summarize(longArticle);
// Output: A perfect 3-sentence summary

// Example 1: E-commerce - Analyze product reviews
// Example 2: Support - Classify incoming tickets
// Example 3: Social - Detect spam comments

// Example: Integration with Express.js
app.post('/analyze', async (req, res) => {
  const result = await api.analyze(req.body.text);
  res.json(result);
});

© sickn33, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (references) in skills/developer-sandbox of sickn33/agentic-awesome-skills.

• SKILL.md
• README.md
• references/detailed-guide.md

Open the folder on GitHubat commit 1e53ce2

Used in 1 other repository

We found 5 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in sickn33/agentic-awesome-skills, which our catalogue first saw on October 7, 2026.

• lingxling/awesome-skills-cnantigravity-awesome-skills/skills/developer-sandboxantigravity-awesome-skills/plugins/agentic-awesome-skills/skills/developer-sandbox+1 more