1
Map the build graph
Codna resolves headers, includes, template instantiations, and the CMake target graph with full blast radius — deterministically, for zero LLM tokens.
C++
Fix C++ bugs with Codna
Header includes, template instantiations, and a sprawling CMake build make C++ bugs hard for an agent to trace. Codna is an AI C++ pair programmer that builds the dependency graph deterministically, so each fix starts from facts, not guesses.
The problem
Why C++ bugs are hard to fix
A failing assertion can trace back through a transitive header, a template specialization, or a translation unit the test never names directly. Engineers lose hours rebuilding, reading link errors, and chasing undefined behavior across files the directory layout doesn't reveal. Feeding the whole tree to a language model is slow and lossy, and the build graph rarely matches what you see on disk. Effective AI C++ debugging has to resolve the include and link paths first, then point at the one file that actually broke.
How Codna fixes it
How Codna fixes C++
Whole repo100,000+
Evidence bundle~600
2
Fix from a tiny evidence bundle
The agent receives the failing assertion, the call chain, and the suspect functions in about 600 tokens — 162x less context than reading the whole tree.
3
Verify with your own tests
Codna rebuilds and re-runs your project's test target; the patch ships only after CTest, GoogleTest, or Catch2 goes green.
codna fix . --issue "Matrix::operator* gives wrong result for non-square inputs"
What you get
What you get
Zero-token build-graph map
Codna maps headers, templates, and CMake targets with a deterministic engine — no embeddings, no RAG, and no LLM tokens spent just to understand the repo.
A ~600-token evidence bundle
Instead of streaming 100k+ tokens of source, the AI coding agent gets a focused bundle — the failing test, call chain, and suspect translation units — 162x less context.
Every fix verified by your tests
Each c++ ai bug fix is rebuilt and run against your existing test target before it lands, at a measured cost of about $0.04 per verified fix.
The proof
Fewer tokens. Faster. Verified.
Frequently asked
Yes — the deterministic graph follows your targets, includes, and link dependencies, so a fix accounts for the translation units it actually touches, not just the file you opened.
Codna rebuilds and runs your existing test target. The failing test is the oracle; the patch only ships once CTest, GoogleTest, or Catch2 passes.
Yes. Codna resolves template instantiations and transitive header includes, so the agent fixes the root cause instead of a symptom that surfaces downstream.
Yes. Codna ships as a CLI, an MCP server for Cursor and Claude, and a native GitHub App. It can self-host with your own keys (BYOK), fail-closed egress, and no training on your code.
Because Codna fixes from a ~600-token bundle rather than the whole repo, a verified fix costs about $0.04 at public model rates — a fraction of a typical agentic edit that reads the entire tree.
No. The repository map is built by a deterministic engine, so there is no index to stale, no vectors to maintain, and zero tokens spent on understanding before the fix begins.
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