RAG Debugger

Alpha. Test a RAG fix against your real retriever before you ship it.

pip install ragfix
ragfix analyze trace.json
ragfix repair trace.json --retriever myapp.search:retrieve
ragfix check traces/ --retriever myapp.search:retrieve --k 8

Package: https://pypi.org/project/ragfix/

The tool loads one failed trace, picks one small retrieval change, calls your retriever, and keeps the change only when the failed claim becomes supported and no previously supported claim gets worse.

judge_supported is that judge's label. It is not ground truth. On a 200-example slice, Llama, Qwen, and Laya all scored below the 0.635 majority baseline. See RESULTS.md.

Repair

Four changes only: increase_k, restore_original_query, rerank_candidates, merge_retrieved.

ragfix repair failure.json --retriever myproject.retrieval:search --judge qwen

--judge is llama, qwen, openai, overlap, local, or module:function. With no flag, OpenAI is used when OPENAI_API_KEY is set. Otherwise the lexical overlap judge runs, so the command works with no key and no GPU.

A run that should be kept looks like this:

RAG Debugger
Judge: overlap

Failed claim
"Paris is the capital of France."

Diagnosis
Likely retrieval failure

Experiment
increase_k: 1 → 6

Before
unsupported

After
supported

Regression check
0 previously supported claims checked
0 regressions

judge_supported=true

Recommendation
ACCEPT EXPERIMENT

A run that should be thrown away looks like this. The failed claim may improve, and a claim that was already supported gets worse:

Recommendation
REJECT EXPERIMENT

Try that case:

ragfix repair examples/traces/accept_increase_k.json \
  --retriever examples.demo_retriever:retrieve --judge overlap

ragfix repair examples/traces/reject_increase_k.json \
  --retriever examples.demo_retriever:retrieve --judge overlap

The reject trace already supports “The desk lamp uses 40 watts.” Wider k returns Paris and drops the lamp, so the recommendation is REJECT EXPERIMENT.

Check a change across many traces

Before you change k, the chunk size, the embedding model, or the reranker, run the new retriever over your logged traces:

ragfix check logged_traces/ --retriever myapp.search:retrieve_v2 --judge overlap
ragfix check logged.jsonl --retriever myapp.search:retrieve --k 8 --out report.json

Traces checked: 26
Fixed:     17 / 19 failing traces
Broken:    4 / 7 working traces
Mixed:     1 traces fixed one claim and broke another
Unchanged: 4

Recommendation
REVIEW BEFORE SHIPPING

The logged retrieved_chunks are the "before". The retriever you pass is the "after". Each broken trace is listed by name with the claim that lost its support. --k overrides every trace's logged top_k.

Wikipedia example

python -m examples.wiki_demo logs BM25 top-1 over 2,067 SQuAD Wikipedia passages (150 questions), then checks two changes. The gold line is whether the dataset answer string is in the retrieved text. It is not the sealed study.

Replacing BM25 with all-MiniLM-L6-v2 at the same k:

Packing BM25 top-6 into a 90-word budget fixed 6 and broke 93 of the 117 answers BM25 already had. The tool's recommendation on both changes is REVIEW BEFORE SHIPPING.

Your retriever

def retrieve(query: str, k: int):
    return [{"id": "1", "text": "..."}]

LangChain:

from ragfix.integrations.langchain import as_retriever, trace

failure = trace("What does the desk lamp use?", chain_result, top_k=1)
failure.save("failure.json")
# ragfix repair failure.json --retriever myapp:retrieve
# or, in Python, pass as_retriever(vectorstore.as_retriever()) to run_verified_repair

as_retriever sets k and returns {id, text} chunks.

Trace

{
  "question": "...",
  "answer": "...",
  "retrieved_chunks": [{"id": "r1", "text": "..."}],
  "corpus_chunks": [{"id": "c47", "text": "..."}],
  "metadata": {"retriever": "faiss", "top_k": 4}
}

Frozen results

The sealed holdout and the mixed Hotpot comparison are frozen. Diagnosis did not beat blind increase-k: 66/76 versus 67/76, and 11/35 versus 12/35. On 12 controls, blind increase-k regressed 4 working answers. The guarded path regressed 0. Do not retune those sets.

On the SQuAD development half, selective repair also stays behind increase-k at the 5% regression budget (overlap 354 vs 382, Llama 333 vs 382, Qwen 274 vs 382, Mistral 247 vs 382). The guard matched no-guard on all four. The final test is not scored. Details are in RESULTS.md.

ragfix with no subcommand prints help. ragfix serve is the older demo server.