Ctxfw
AST context firewall that cuts agent prompt tokens by 67%
Details
- External ID
- 49893845
- Source
- HN
- Company
- —
- Product
- Ctxfw
- Website domain
- github.com
- Launched
- Sept. 29, 2026
- Cohort
- —
- Upvotes
- 5
- Upvotes percentile
- 0.12998405103668262
- Tags
- —
- Fetched at
- Sept. 30, 2026, 5:01 p.m.
- Updated at
- Sept. 30, 2026, 5:01 p.m.
Enrichment
- Theme
- developer tools for ai agents
- Vertical
- Horizontal
- Function
- Model & infra
- Audience
- Developer
- AI stance
- AI-native
- Project type
- Commercial product
- Normalized one-liner
- ast-based prompt token reducer for ai agents
- Manually corrected
- False
Could you build this?
Partial Building an AST-based code pruner or context filter involves complex language-specific AST parsing, symbol resolution, and context-dependent dependency extraction across diverse programming languages.
What it would actually take: Requires integrating tree-sitter or language-specific compiler parsers for multiple programming languages. The system must construct accurate symbol dependency graphs, call graphs, and scoping trees to prune redundant definitions without breaking syntax or semantic context. Specialized compiler engineering knowledge and rigorous testing on diverse real-world repos are needed.
Discussion
No comments on this launch.
Competitors
Other products that read as similar to this one — 444 launches clear the similarity bar, closest 8 shown.
Attention rank: #358 of 445 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 330 days after the earliest competitor.
- Tired of duct-taping access control into agent prompts. Here's the fix · hn · 2026-06-03 · 22 upvotes · similarity 0.53
- AgentReady · hn · 2026-02-23 · 8 upvotes · similarity 0.48
- alter-zero · github · 2026-09-13 · 15 upvotes · similarity 0.47
- Fortress · hn · 2026-07-08 · 43 upvotes · similarity 0.47
- agentdock-mcp-harness · github · 2026-09-21 · 15 upvotes · similarity 0.47
- PentestPi · github · 2026-09-09 · 15 upvotes · similarity 0.46
- Fortress · hn · 2026-07-04 · 7 upvotes · similarity 0.46
- genpark-indirect-prompt-injection-sanitizer-skill · github · 2026-09-26 · 7 upvotes · similarity 0.45
Other launches for this product
- No other launches for this product.
Same idea, different domain
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