TokenPath
token-level citations for LLM output, read from attention
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HN · launched Jul 21, 2026 · 5 upvotes (top 89%) · 0 views
Niche: machine learning developer tools · 303 launches, 11 in the last 7 days ▼ -45% · Explore this niche →
Category and tags
- Horizontal
- Observability & eval
- Developer
- AI-native
- Commercial product
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More like this: all 303 launches in machine learning developer tools →
Could you build this?
Partial While standard RAG can be vibe-coded, TokenPath extracts token-level attribution directly from internal transformer attention matrices, which requires hosting open-weight LLMs with custom attention hooks or attribution model pipelines.
What it would actually take: Requires a dedicated GPU inference service (vLLM, HuggingFace TGI, or custom PyTorch) configured to extract cross-attention maps and gradient-based attributions (e.g., Integrated Gradients or Attention Rollout) between source context tokens and output tokens. The hard part is efficiently aggregating dense, high-dimensional attention tensors into coherent span-level attributions at low latency without blowing up GPU memory.
Discussion
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Competitors
Other products that read as similar to this one : 1267 launches clear the similarity bar, closest 8 shown.
Attention rank: #1136 of 1268 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 265 days after the earliest competitor.
- Tokensift, an open-sourced token-efficiency linter for LLM prompts · hn · 2026-08-29 · 6 upvotes · similarity 0.66
- CTON: JSON-compatible, token-efficient text format for LLM prompts · hn · 2025-11-20 · 13 upvotes · similarity 0.64
- LLM Wiki · hn · 2026-04-06 · 6 upvotes · similarity 0.57
- LLM Attention Visualization · hn · 2026-09-08 · 173 upvotes · similarity 0.57
- finextract · github · 2026-10-31 · 24 upvotes · similarity 0.55
- A better LLM-wiki with multi-path research [550 stars] · hn · 2026-06-11 · 5 upvotes · similarity 0.55
- Reducing LLM input tokens by 70% · hn · 2026-05-12 · 56 upvotes · similarity 0.55
- prompt-poet · github · 2026-11-05 · 50 upvotes · similarity 0.55
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