> For the complete documentation index, see [llms.txt](https://docs.lpp-minduniverse.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lpp-minduniverse.org/lingua-pactum-protocol-lpp-documentation/12.-interoperability-and-standards/12.8-interoperability-principles.md).

# 12.8 Interoperability Principles

The LPP interoperability model is governed by four primary principles:

1. **No forced full-stack adoption**
2. **Portable authority semantics**
3. **Cross-principal recognition**
4. **Externally verifiable evidence**

#### No Forced Full-Stack Adoption

An organization does not need to deploy:

```
SourceMind
+
FaithLocked
+
Jarvis
+
ActuMind
+
SVNN
+
every Mind Universe component
```

in order to use LPP-compatible authority and admission semantics.

An external system may retain its own:

* source governance,
* task orchestration,
* model runtime,
* identity provider,
* policy engine,
* security stack,
* execution platform,
* and evidence infrastructure.

The required principle is that the LPP governance boundary remains semantically preserved where LPP is adopted.

#### Portable Authority Semantics

An Authority Object should not lose its meaning when it moves between compatible systems.

The portable semantics include concepts such as:

```
Who issued the authority?
Who is the subject?
What scope applies?
What was authorized?
When is it valid?
Has it been revoked?
What policy state applies?
What consequence constraints exist?
```

The wire encoding may vary.

The governance meaning must remain reconstructable.

#### Cross-Principal Recognition

Interoperability must allow one system to determine whether another principal's authority can be legitimately recognized.

This does not mean universal trust.

It means trust is explicit.

```
Recognized
Pending
Denied
```

or equivalent states are preferable to implicit authority inheritance.

#### Externally Verifiable Evidence

A receiving system, auditor, or other authorized verifier should be able to inspect the relevant evidence rather than relying only on:

```
"The originating AI said it was approved."
```

The objective is:

```
Claim
        ↓
Governance Object
        ↓
Verifiable Evidence
        ↓
Independent Reconstruction
```

#### No Semantic Downgrade

Cross-system mapping must not silently weaken a mandatory LPP condition.

For example:

```
REVOKED
```

must not be translated into:

```
UNKNOWN
→ allow
```

or:

```
out-of-scope
```

into:

```
approximately allowed.
```

The non-compensatory Layer 0 semantics must survive interoperability.

#### Fail-Closed Recognition

Where a mandatory cross-system authority condition cannot be established:

```
Recognition Unknown
```

does not become:

```
Recognition Verified.
```

This extends the Layer 0 fail-closed principle across system boundaries.