hSUM

Coding & Development AI Models & APIsFree

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About hSUM

hSUM is a local evidence system designed to provide stateful understanding and memory for agents by adding citations to each answer. It operates as a stateful layer that reads project files, stores a SQLite index, and performs exact passage retrieval without network access after installation. The tool integrates with agents via CLI and MCP, enabling agents to open citations directly from their responses. Installation is user-level and project-scoped, with no modifications to repository files. It supports macOS ARM64 and Linux x86_64, and the installer is SHA-256 verified. The system is read-only and project-scoped, ensuring it only accesses and indexes the current repository. Documentation and verification steps are provided to confirm successful installation and citation round trips.

Key features

Stateful understanding and memory for agents
Exact passage retrieval from project files
SQLite-based indexing
CLI and MCP integration
User-level installation
Project-scoped read-only access
SHA-256 verified installer
No network access after installation

Use cases

Adding verifiable citations to agent-generated code or documentation
Enabling agents to reference exact passages in project files
Providing local, project-specific context for agent responses

Pros

Adds citations to agent answers for traceability
Operates locally without network access after installation
Project-scoped and read-only to maintain repository integrity
Supports macOS ARM64 and Linux x86_64
Uses SQLite for indexing and exact passage retrieval

Cons

Pre-release version (0.1.0-alpha.4) with limited stability
Requires explicit user approval for macOS notarization bypass
No Windows support
Installation process involves multiple verification steps

Frequently asked questions about hSUM

What does hSUM do?

hSUM is a local evidence system that adds citations to agent answers by indexing project files and storing a SQLite index for exact passage retrieval. It operates without network access after installation and integrates with agents via CLI and MCP.

Who is hSUM designed for?

hSUM is designed for developers and agents that require stateful understanding and memory with verifiable citations. It is particularly useful for projects where local, project-scoped evidence retrieval is critical.

How does hSUM integrate with agents?

hSUM integrates with agents through CLI and MCP, enabling agents to open citations directly from their responses. The integration is verified via commands like `hsum integration status codex`.

What are the system requirements for hSUM?

hSUM supports macOS ARM64 and Linux x86_64. The installer is SHA-256 verified, and the system is read-only and project-scoped, ensuring it only accesses the current repository.

How do I verify the hSUM installation?

Installation can be verified by confirming the installer's SHA-256 checksum, checking the successful citation round trip, and running `hsum integration status codex --json` to verify registration and agent policy.

Is hSUM network-dependent after installation?

No, hSUM operates without network access after installation. It reads project files, stores a SQLite index, and performs exact passage retrieval locally.