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/valsteen/write-code-by-hand/insert-blocknpx skills add valsteen/write-code-by-hand --skill insert-blockgit clone --depth 1 https://github.com/valsteen/write-code-by-handWhat 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 | $0.00049 | $0.00240 |
| Opus 5 | $0.00024 | $0.00120 |
| Sonnet 5 | $0.00010 | $0.00048 |
| Haiku 4.5 | $0.00005 | $0.00024 |
Grade A, and why
insert-block 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 yesterday.
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.
What it actually says
Insert Block
Insert exactly the text supplied by the user.
Operational framing: ingest human-authored bytes. Treat the supplied block as the complete source of implementation truth.
Required Inputs
- Target file.
- Insertion location: before line, after line, at cursor, or end of file.
- Exact block text.
If any input is missing, ask for it.
Rules
- Preserve the supplied text exactly, including indentation and blank lines.
- Do not generate missing code.
- Do not wrap, reformat, or rename anything.
- If the user says "insert this" but provides no block, ask them to type it.
- After insertion, update the cursor to the end of the inserted block.
Output
Confirm:
Inserted exactly <n> line(s) <location> in <path>.
Cursor: <line>
Offer to show the changed range.
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.
- yesterday First seen · 39 lines · 49 tokens per session scan A 0c7b78af8511
insert-block is a skill published in the GitHub repository valsteen/write-code-by-hand (5 stars, last pushed 2mo ago), licensed MIT. It adds 49 tokens to every session and 240 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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