Ktx

The context layer for data agents

Quickstart · CLI Reference · Agent Setup · Slack

Built and maintained by Kaelio

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ktx is a self-improving context layer that teaches agents how to query your warehouse accurately - from approved metric definitions, joinable columns, and business knowledge it builds and maintains for you.

> [!NOTE] > Run ktx with your own LLM API keys or a local agent sign-in — a > Claude Pro/Max subscription through Claude Code, or your local Codex > authentication. No extra usage billing from ktx.

Why ktx

General-purpose agents struggle on data tasks. They re-explore your warehouse on every question, invent their own metric logic, and return numbers that don't match approved definitions.

Traditional semantic layers don't fix this. They demand constant manual upkeep and don't absorb the rest of your company's knowledge.

ktx does both, automatically:

• Learns from company knowledge. Ingests wiki content, organizes it,

removes duplicates, and flags contradictions for human review.

• Maps the data stack. Samples tables, captures metadata and usage

patterns, detects joinable columns, and annotates sources so agents write better queries.

• Builds a semantic layer. Combines raw tables and high-level metrics

through a join graph that automatically resolves chasm and fan traps, so agents fetch metrics declaratively instead of rewriting canonical SQL each time.

• Serves agents at execution. Exposes CLI and MCP tools with combined

full-text and semantic search across wiki and semantic-layer entities.

How ktx compares

| | General-purpose agent | Traditional semantic layer | ktx | | --- | :---: | :---: | :---: | | Builds warehouse context automatically | — | — | ✓ | | Detects joinable columns + resolves fan/chasm traps | — | Manual | ✓ | | Approved, reusable metric definitions | — | ✓ | ✓ | | Absorbs wiki / Notion / team knowledge | — | — | ✓ | | Flags contradictions across sources | — | — | ✓ | | Ships CLI + MCP for agent execution | Partial | — | ✓ | | Read-only by design | n/a | n/a | ✓ |

Who is ktx for

Use ktx if you:

• Want agents like Claude Code, Codex, Cursor, or OpenCode to query your

warehouse with approved metric definitions

• Have business knowledge scattered across dbt, Looker, Metabase, Notion, and

team wikis

• Need agents to reuse canonical SQL instead of inventing it on every prompt

Skip ktx if you:

• You don't have a SQL warehouse - ktx sits on top of one
• You only need one ad-hoc query - psql or a notebook will do

Works with PostgreSQL, Snowflake, BigQuery, ClickHouse, MySQL, SQL Server, and SQLite. Integrates with dbt, MetricFlow, LookML, Looker, Metabase, and Notion.

Quick Start

npm install -g @kaelio/ktx
ktx setup
ktx status

ktx setup creates or resumes a local ktx project, configures providers and connections, builds context, and installs agent integration.

Example ktx status after setup:

ktx project: /home/user/analytics
Project ready: yes
LLM ready: yes (claude-sonnet-4-6)
Embeddings ready: yes (text-embedding-3-small)
Databases configured: yes (warehouse)
Context sources configured: yes (dbt_main)
ktx context built: yes
Agent integration ready: yes (codex:project)

> [!TIP] > Already using an agent? Ask Claude Code, Codex, Cursor, or OpenCode from > your project directory: > > ``text > Run npx skills add Kaelio/ktx --skill ktx and use the ktx skill to install > and configure ktx in this project. > ``

> [!IMPORTANT] > If ktx status prints ktx mcp start --project-dir ..., run it before > opening your agent client.

Upgrading

Re-run the global install with the @latest tag:

npm install -g @kaelio/ktx@latest

First commands

| Command | Purpose | | --- | --- | | ktx setup | Create, resume, or update a ktx project | | ktx status | Check project readiness | | ktx ingest | Build context for every configured connection | | ktx sl "revenue" | Search semantic sources | | ktx wiki "refund policy" | Search local wiki pages | | ktx mcp start | Start the MCP server for agent clients |

See the CLI Reference for every command, flag, and option.

Project Layout

my-project/
├── ktx.yaml                         # Project configuration
├── semantic-layer//  # YAML semantic sources
├── wiki/global/                     # Shared business context
├── wiki/user//             # User-scoped notes
├── raw-sources//     # Ingest artifacts and reports
└── .ktx/                            # Local state and secrets, git-ignored

Commit ktx.yaml, semantic-layer/, and wiki/. Keep .ktx/ local.

Project resolution defaults to KTX_PROJECT_DIR, then the nearest ktx.yaml, then the current directory. Pass --project-dir when scripting.

FAQ

• Does ktx send my schema or query results to a hosted service?

No. ktx runs locally. The only data leaving your machine is what you send to the LLM provider you configured.

• Which LLM backends are supported?

Anthropic API, Google Vertex AI, AI Gateway, the local Claude Code session through the Claude Agent SDK, and your local Codex authentication through the Codex SDK. See LLM configuration.

• How is ktx different from a dbt or MetricFlow semantic layer?

ktx ingests those layers and combines them with raw-table introspection and wiki content. Agents get one searchable surface instead of three disconnected ones - and ktx flags contradictions across sources.

• Does ktx need a running server?

There is no hosted service. The local MCP daemon runs on demand via ktx mcp start when an agent client needs it.

• Is my warehouse safe?

Yes. Connections are read-only - ktx never writes to your database.

Docs

• Quickstart
• The Context Layer
• Building Context
• CLI Reference
• AI Resources
• Community & Support

Community

• Slack — ask questions, share what you're building, and chat with maintainers.
• GitHub Issues — report bugs and request features.
• Contributing — set up the repo, run tests, and open a PR.

Development

git clone https://github.com/kaelio/ktx.git
cd ktx
pnpm install
uv sync --all-groups
pnpm run build
pnpm run check

ktx is a pnpm + uv workspace:

| Path | Purpose | | --- | --- | | packages/cli | TypeScript CLI and published npm package source | | packages/cli/src/context | Core context engine | | packages/cli/src/llm | LLM and embedding providers | | packages/cli/src/connectors | Database scan connectors | | python/ktx-sl | Semantic-layer query planning | | python/ktx-daemon | Portable compute service |

Local development CLI:

pnpm run setup:dev
pnpm run link:dev
ktx-dev --help

Useful checks:

pnpm run type-check
pnpm run test
pnpm run dead-code
uv run pytest -q

Telemetry

ktx collects privacy-conscious usage telemetry to understand installs and improve setup, command reliability, and data-agent workflows. Catalog telemetry events do not record file paths, hostnames, SQL, schema names, table names, column names, error messages, raw environment values, or argv. Error reports use PostHog Error Tracking and can include stack frames and raw error messages, which may contain local file paths or the local username in those paths. ktx redacts secrets, credentials, database URLs, auth headers, argv, raw environment values, SQL text, row data, and user-typed prompt or MCP argument text from the explicit $exception payload. See Telemetry for the event catalog and opt-out options.

License

ktx is licensed under the Apache License, Version 2.0. See LICENSE.

Star History

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: Kaelio
• Source: Kaelio/ktx
• License: Apache-2.0
• Homepage: https://docs.kaelio.com/ktx

Install and usage instructions live in the source repository linked above.