2026-10-11 16:38 UTC

Eris System’s author presents a local-agent tool-routing design spanning grep, embeddings, and GBNF grammar constraints, potentially giving builders a concrete alternative to unconstrained LLM tool selection.

state: seedheat: lowuncertainty: highconvergesscott: mediumagent-harnesses local-inference tool-routingEris System

What is this?

The case identifies a post attributed to Eris System’s author titled “Tool routing for a local LLM agent: grep to embeddings to GBNF grammar,” suggesting an exploration of retrieval and grammar constraints for selecting agent tools. None of the supplied search-result snippets directly identifies Eris System, its author, or the post, so the implementation, release status, and advantages over unconstrained selection remain unverified. The results provide related context on tool routing and grammar-based validation, but do not establish that Eris System uses the compiler feedback loop claimed in the web answer.

Why it matters to Scott

The described retrieval-based tool selection provisionally converges with Scott’s progressive tool-discovery position in Code-First Architecture, while grammar-constrained calls offer a concrete investigation target for Ask’s local-model path, which suppresses native tools and repairs alternative call formats. This is a potential implementation comparison, not verified adoption or a demonstrated improvement: the supplied evidence establishes neither Eris’s implementation nor reliability gains, and the radar hits track adjacent routing approaches rather than this development.
ip:framework.code-first-architecturedev:project.askdev:concept.multi-format-tool-call-parsingradar:concept.tool-callingradar:routed-zero-token-skill-routerradar:competence-gate-local-tool-routing
queries asked of Scott's wikis
  • agent harness tool selection constrained decoding
  • local inference tool calling reliability
  • grep versus embeddings tool retrieval
  • GBNF grammar constraints action validation
  • deterministic routing versus LLM orchestration

Measured heat

now 0 pts/hpeak 0 pts/hcomments 0/hpeers p14momentum: steady2 platformsage 773h
points/hour across evidence · reading as of 2026-10-12 02:59:37.977291+11:00 · deterministic, not a model opinion

How the heat travelled

09-09 11:23 (minted)⭐ origin echo-reconstructedThe linked post describes “Tool routing for a local LLM agent: grep to embeddings to GBNF grammar.”
Eris System on blog (echo) · attributed from hn.story.49624340 · published time unknown
—
09-09 10:49first on hacker news · published · lag ?Tool routing for a local LLM agent: grep to embeddings to GBNF grammar
hagbardCelin3
—
09-09 10:49amplified on hacker news 👑hn.story.49624340
hagbardCelin3
peak 1 · 0 comments · 106% of case engagement
09-09 11:21our radar first saw it · lag ?discovery anchor: hn.story.49624340—
pace: p11 vs 519 stories at the 720h mark (now 773h old) — behind addom-local-coding-harness (0.5x)

Evidence (2) — ⭐ canonical anchor

sourceobjectauthorscorecomments
🟧 hnTool routing for a local LLM agent: grep to embeddings to GBNF grammarhagbardCelin310
🟧 echo.blog ⭐The linked post describes “Tool routing for a local LLM agent: grep to embeddings to GBNF grammar.”Eris System——

Interpretation history

Decision trace