Show HN: theta-spec - a humble harness agnostic configuration spec
Theta-spec is a new configuration standard designed for AI coding agents that is harness-agnostic. It allows for a single configuration file, theta.toml, to define various aspects of agent behavior and tools. This initiative aims to simplify the management and sharing of agent configurations across different platforms.
- ▪Theta-spec provides a declarative configuration standard that can be used across various AI agent harnesses.
- ▪The configuration file, theta.toml, encompasses instructions, rules, tools, skills, and subagents in one place.
- ▪The default implementation of this spec is a Rust CLI that facilitates the resolution and management of configurations.
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Record
| Original publisher | GitHub |
| Canonical URL | https://github.com/tamarillo-ai/theta-spec |
| Publication time | Fri, 29 May 2026 01:09:54 +0000 |
| Retrieval time | 2026-05-29T01:29:39.549Z |
| Last seen | 2026-05-29T01:29:39.549Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | NSL52X3RbViO |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
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| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
theta-spec theta-spec is a declarative, harness-agnostic configuration standard for AI coding agents. One theta.toml file defines the full configuration surface, i.e. instructions, rules, tools, skills, subagents. A protocol is specified for the lifecycle of this configuration file, and any theta-spec compliant implementation can resolve, lock, and cast it to any supported harness. theta is the default implementation of this spec — a Rust CLI that resolves, locks, and casts theta.toml to any supported harness. Docs All the documentation for the specification is present here and can also be built and served locally by running uv run mkdocs serve --livereload Motivation Agent harnesses are here to stay. Each one ships its own configuration format but still all of them share similarities.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at GitHub.