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 agents/the-teacher/active_harness/normalize_inputgit clone --depth 1 https://github.com/the-teacher/active_harnessWhat 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 | $0.00000 | $0.00263 |
| Opus 5 | $0.00000 | $0.00131 |
| Sonnet 5 | $0.00000 | $0.00053 |
| Haiku 4.5 | $0.00000 | $0.00026 |
Grade A, and why
normalize_input 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 2d 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.
What it actually says
Input Normalization
Before every call, ActiveHarness automatically normalizes @input by stripping leading and trailing whitespace and collapsing internal whitespace sequences to a single space.
" Hello world\n" → "Hello world"
This is enabled by default to trim unnecessary tokens and avoid subtle formatting issues.
Disabling
To opt out for a specific agent:
class VerbatimAgent < ActiveHarness::Agent
normalize_input false
end
How it works
Normalization runs in two places:
initialize— applied immediately after@inputis set, before the:setuphook fires.call(input)— applied when input is passed inline tocall.
The equivalent transformation is:
@input = @input&.strip&.gsub(/\s+/, " ")
Notes
normalize_input falseonly affects the automatic normalization. You can still normalize manually inside a:setuphook or:before_callhook if custom logic is needed.- The option applies at the class level and is inherited by subclasses unless overridden.
nilinput is left asnil(the safe-navigation operator&.protects against it).
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.
- 2d ago First seen · 39 lines · 0 tokens per session scan A ff2b3eec1743
normalize_input is an agent published in the GitHub repository the-teacher/active_harness (89 stars, last pushed 23d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 263 tokens. 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 2026-08-30.
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