> ## Documentation Index
> Fetch the complete documentation index at: https://docs.quanux.org/symphony/llms.txt
> Use this file to discover all available pages before exploring further.

# SKVI: The Symphony Knowledge Vector Index Engine

> SKVI deterministically indexes each canonical SKV surface once, checks manifest-declared coverage, and emits disposable digest-bound projections without touching truth.

The Symphony Knowledge Vector Index (SKVI) is the engine that maps current canonical truth across every SKV surface. It is an independently installable C++ process that operates deterministically, read-only, and cannot decide membership or write canonical files.

## What SKVI does

SKVI performs three bounded operations:

* **Inspect and check**: verify that every manifest-declared required surface is indexed exactly once, with a stable owner, truth role, relationships, consumers, and projection eligibility.
* **Propose**: accept caller-declared immutable proposals for index changes without applying them.
* **Project**: emit disposable digest-bound projections of the current index for downstream consumers.

## What SKVI does not do

SKVI never decides feature-worthiness or manifest membership. Ownership stays with each vector's Contract Quad. SKVI also does not:

* Write or rewrite canonical Markdown
* Publish anything to a public projection
* Grant authority merely because it generated evidence

## When to use it

Use SKVI to confirm that a repository is fully covered before you propose a source change, or to see which owner and truth role a specific surface carries. Its projections feed proposal reviewers, agent context, and validator baselines.

<Note>
  SKVI is one of the read, query, validate, and propose engines. Canonical apply remains disabled across the ratified vector engines until each engine's SSIAG, expected-state transaction, qxctl safeguard, STAV event, recovery, and negative-test contracts are complete.
</Note>

## Related surfaces

<CardGroup cols={2}>
  <Card title="SKV overview" icon="book-open" href="/symphony/symphony/skv/overview">
    The umbrella framework that governs SKVI.
  </Card>

  <Card title="SCLV" icon="clock-rotate-left" href="/symphony/symphony/skv/sclv">
    The append-only change ledger that records completed material source changes.
  </Card>

  <Card title="qxctl vector commands" icon="terminal" href="/symphony/symphony/qxctl/vector-commands">
    Run `qxctl skvi ...` to invoke inspect, check, and propose.
  </Card>

  <Card title="Validator" icon="clipboard-check" href="/symphony/symphony/governance/validator">
    Independent read-only checks that complement SKVI coverage.
  </Card>
</CardGroup>


## Related topics

- [Knowledge Session Coordinator for Symphony Vector Engines](/symphony/symphony/engines/coordinator.md)
- [Symphony Knowledge Vector: SKV Framework Overview](/symphony/symphony/skv/overview.md)
- [SCLV: Symphony Change Ledger Vector for Source Changes](/symphony/symphony/skv/sclv.md)
- [qxctl Vector Commands: skvi, sclv, sacv, sodv, ssfv, shv](/symphony/symphony/qxctl/vector-commands.md)
- [Symphony Vectors and Delivery Phases](/symphony/symphony/concepts/vectors.md)