SECAI Core · phase 7 of 15 · noun
Modality limit
Controlling which type of input and output a model can handle
The Explain card
- Plain English
- A modality limit controls which types of input and output a model is allowed to handle, such as text only, or text and images but not audio or file generation.
- Example
- A customer support assistant is restricted to text. Disabling image input means an attacker cannot upload a screenshot containing hidden instructions, and removing file output prevents it from generating executables.
- Why it matters
- Every modality is an attack surface with its own injection tricks. Limiting the model to what the use case needs shrinks that surface, and it is a cheap control to apply.
- Hook
- Modality limit: if the job only needs text, do not give the model eyes and hands.
Word knowledge
How the word is built, where it came from, and what it sits beside in memory.
In a sentence
On the inference gateway, the modality limit rejects the JPEG attachment, so the support model never sees the screenshot.
Why these words
- modality Medieval Latin modalitas, from Latin modus, manner names the channel the phrase is drawing a line around, the text, image, audio, or file stream
- limit Latin limes, limitis, boundary, via Old French limite supplies the head noun, the cap that closes that channel
Where it came from
- Origin
- English AI-security collocation from Medieval Latin modalitas (from Latin modus, manner) and Latin limes, limitis, boundary, via Old French limite
- Entered the language
- 2020s
- What changed
- Modality had meant the quality of being a mode, then the mood of a proposition, then a method of treatment, then a sensory channel, then a type of data a model takes. Limit had meant a boundary between fields, then any cap. Gateway runbooks of the 2020s joined them for the switch that turns a channel off.
How it is spelled
- Pattern
- -ality nouns sit beside -al adjectives
- Pattern
- single m in limit, from Latin limes
- Breaks the pattern
- the noun phrase stays two words; the hyphen appears only when it modifies another noun
- Breaks the pattern
- modality keeps the middle a of modal and is not spelled modility
Spelled like
- morality
- locality
- limitation
- delimiter
Broken into chunks
-
modal
- bimodal
- multimodal
- unimodal
-
ity
- reality
- locality
- morality
-
limit
- limited
- unlimited
- limitation
What it sits beside
Same subject
Same shape
- token limit
- time limit
- credit limit
- character limit
Runtime caps
Limit compounds
- token limit
- time limit
- credit limit
Modality compounds
- multimodal
- unimodal
- cross-modal
Where it sits in the deck
Phase 7: AI-Specific Runtime Controls: Guardrails, Limits, and Enforcement
Responsible AI principles must be enforced mechanically — learn the runtime controls that constrain model inputs, outputs, and resource consumption.
