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 oborchers/fractional-cto --skill abbreviation-policygit clone --depth 1 https://github.com/oborchers/fractional-ctoWrote 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/oborchers/fractional-cto/abbreviation-policy)<a href="https://agentmods.dev/skills/oborchers/fractional-cto/abbreviation-policy"><img src="https://agentmods.dev/badge/skills/oborchers/fractional-cto/abbreviation-policy/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/oborchers/fractional-cto/abbreviation-policy"><img src="https://agentmods.dev/badge/skills/oborchers/fractional-cto/abbreviation-policy.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 | $0.00059 | $0.03336 |
| Opus 5.5 | $0.00024 | $0.01334 |
| Sonnet 5.5 | $0.00012 | $0.00667 |
| Haiku 4.5 | $0.00006 | $0.00334 |
Grade A, and why
abbreviation-policy 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 5d 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 — 306 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Full Words by Default, Abbreviations by Exception
Every abbreviation is a tax on the reader. The writer saves a few keystrokes; every future reader pays the cost of decoding. Modern editors autocomplete. Modern screens are wide. Modern codebases are searched, not memorized. There is no defensible reason to abbreviate an identifier unless the abbreviation is more widely recognized than the full word. url is clearer than uniformResourceLocator. btn is not clearer than button. This is the line, and it is not negotiable.
The Abbreviation Decision Framework
Before using any abbreviation, apply this test in order:
- Is it on the universally understood list? Use it.
id,url,http-- everyone knows these. - Would a new hire need to ask what it means? Spell it out.
txMgrfor "transaction manager" fails this test. - Is it in your project's abbreviation registry? Use it, but only if the registry exists and is maintained.
- None of the above? Use the full word. Always.
The burden of proof is on the abbreviation. Full words are correct by default.
Universally Understood Abbreviations
These abbreviations are approved for use in any codebase without documentation. They are more recognizable than their expanded forms.
| Abbreviation | Meaning | Context |
|---|---|---|
id |
Identifier | Any |
url |
Uniform Resource Locator | Any |
http / https |
Hypertext Transfer Protocol | Any |
api |
Application Programming Interface | Any |
db |
Database | Any |
sql |
Structured Query Language | Any |
html |
HyperText Markup Language | Any |
css |
Cascading Style Sheets | Any |
json |
JavaScript Object Notation | Any |
xml |
Extensible Markup Language | Any |
config |
Configuration | Any |
auth |
Authentication / Authorization | Any |
admin |
Administrator | Any |
err |
Error | Go (idiomatic), acceptable elsewhere |
ctx |
Context | Go (idiomatic), acceptable elsewhere |
req |
Request | Handler functions, middleware |
res / resp |
Response | Handler functions, middleware |
fn |
Function | Callbacks, higher-order functions |
args |
Arguments | Any |
params |
Parameters | Any |
env |
Environment | Configuration, deployment |
src |
Source | Build systems, file operations |
dst |
Destination | File operations, network |
tmp |
Temporary | Only for genuinely temporary values with a lifespan of a few lines |
max |
Maximum | Any |
min |
Minimum | Any |
len |
Length | Any |
num |
Number (count of) | Prefixing a noun: numRetries, num_users |
prev |
Previous | Iteration, state management |
next |
Next | Iteration, state management |
init |
Initialize | Startup, constructors |
msg |
Message | Messaging systems, logs, chat |
doc |
Document | Document management, databases |
img |
Image | Media handling, UI |
btn |
Button | UI contexts only -- never in backend code |
info |
Information | Only as part of a compound: userInfo, errorInfo -- never standalone |
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.
- 5d ago First seen · 306 lines · 59 tokens per session scan A a65dda69f408
abbreviation-policy is a skill published in the GitHub repository oborchers/fractional-cto (32 stars, last pushed 5d ago), licensed MIT. It adds 59 tokens to every session and 3,336 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-10-13.
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