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Why Cline doesn't index your codebase
- coreyh14444 1y agoYep. Have definitely been replacing RAG solutions with search+feed the context window instead lately as well.
- spenczar5 1y agoWhat does that mean? In what way does "search and feed" differ from "retrieve and augment?" Those are practically synonyms to me - is it about tool use vs prompt crafting?
- theturtle32 1y agoCorrect. RAG is a general term as you describe, but it has become inextricably linked with vector databases in the minds of a lot of people, to the extent that GP and even the blog post we're discussing use RAG specifically to mean the use of a vector database after chunking input to create embeddings. I agree with you that RAG should be a generic term that is agnostic to the method of retrieval and augmentation. But at the moment, in a lot of people's minds, it specifically means using a vector database.
- wat10000 1y agoI’m not an expert here, but isn’t “search and feed the context window” exactly what RAG is?
- PhilippGille 1y agoLike the other comment already said, the search is still Retrieval, and putting it into the context window is Augmenting, and the LLM request leads to the Generation. A.k.a. RAG.
- jeffchuber 1y agoThis is still retrieval and RAG, just not vector search and indexing. it’s incredibly important to be clear about terms - and this article does not meet the mark.
- nick-baumann 1y agoFair point Jeff -- you're right that we're still doing retrieval. The key distinction is how we retrieve. Traditional RAG for code uses vector embeddings and similarity search. We use filesystem traversal and AST parsing - following imports, tracing dependencies, reading files in logical order. It's retrieval guided by code structure rather than semantic similarity. I highly recommend checking out what the Claude Code team discovered (48:00 https://youtu.be/zDmW5hJPsvQ?si=wdGyiBGqmo4YHjrn&t=2880 https://youtu.be/zDmW5hJPsvQ?si=wdGyiBGqmo4YHjrn&t=2880). They initially experimented with RAG using embeddings but found that giving the agent filesystem tools to explore code naturally delivered significantly better results. From our experience, vector similarity often retrieves fragments that mention the right keywords but miss the actual implementation logic. Following code structure retrieves the files a developer would actually need to understand the problem. So yes -- I should have been clearer about the terminology. It's not "no retrieval" -- it's structured retrieval vs similarity-based retrieval. And with today's frontier models having massive context windows and sophisticated reasoning capabilities, they're perfectly designed to build understanding by exploring code the way developers do, rather than needing pre-digested embeddings.
- phillipcarter 1y agoProbably good to add a disclaimer at the top that clarifies the definition, since RAG is ultimately just a pattern, and vector indexes are just one way to implement the pattern. Indeed, industry at large sees RAG as equivalent to "vector indexes and cosine similarity w.r.t. input query", and the rest of the article explains thoroughly why that's not the right approach.
- anon373839 1y ago> industry at large sees RAG as equivalent to "vector indexes and cosine similarity w.r.t. input query" Yep, and this is getting really old. Information retrieval is not a new problem domain. Somehow, when retrieved info is fed into an LLM, all nuance is lost and we end up with endless pronouncements about whether retrieval is/is not "dead".
- deepdarkforest 1y agoTerrible stuff and a reddish flag. First of all, gpt signs all over the blog post, reads like a bottom of the barrel linkedin post. But more importantly, why double and triple down on no RAG? As with most techniques, it has its merits in certain scenarios. I understand getting VC money so you have to prove differentiation and conviction in your approach, but why do it like this? What if RAG does end up being useful? You'll just have to admit you were wrong and cursor and others were right? I don't get it. Just say we don't believe RAG is as useful for now and we take a different approach. But tripling down on a technique so early into such a new field seems immature to me. It screams of wanting to look different for the sake of it.
- ramesh31 1y agoCline is, hands down, the most effective agentic coding tool out there. I've extensively daily driven any one of them you can name, and there's nothing even close. The reality is that no one knows how any of this stuff should work, and RAG is just a term that was made up a few years ago; it has no strict formal definition. There's a long way to go before anyone knows what the correct way to do things should be, but they are clearly on the right path from direct experience.
- cdelsolar 1y agoWhat's incredible to me is that it's open source. I've learned a ton about prompting and agent workflows, tool use, etc. from its code.
- MisterSandman 1y agoThat’s not universally true. I’ve had a better experience with Amazon Q than I’ve had with Cline.
- beauzero 1y agoI agree. This is the golden tool that doesn't get the hype. Well as golden as tools get. Hope they can keep delivering. It seems to hit my personal sweet spot.
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- mindcrash 1y agoWarning: I don't know what this post does in the background but it definitely slows down Firefox 138 to the point that it is barely usable
- electroly 1y agoI'm not convinced--codebase indexing is still a killer feature in Cursor. I have tens of thousands of reference files stashed in the project directory to be indexed so that any time the model reaches out to the codebase search tool with a question, it finds a file with the answer. Lots of it is not code and has no AST representation; it's documentation. Without codebase indexing, it may entirely miss the context. 1. This argument seems flawed. Codebase search gives it a "foot in the door"; from that point it can read the rest of the file to get the remaining context. This is what Cursor does. It's the benefit of the agentic loop; no single tool call needs to provide the whole picture. 2. This argument is "because it's hard we shouldn't do it". Cursor does it. Just update the index when the code changes. Come on. 3. This argument is also "because it's hard we shouldn't do it". Cursor does it. The embeddings go in the cloud and the code is local. Enforced Privacy Mode exists. You can just actually implement these features rather than throwing your hands up and saying it's too hard. This honestly makes me think less of Cline. They're wrong about this and it seems like they're trying to do damage control because they're missing a major feature.
- chime 1y agoSame with Augment. Indexing makes a huge difference in a large monorepo and I can't imagine working in an editor that doesn't support an LLM with full indexing.
- rtfeldman 1y agoA better argument against vector embeddings for AI code agents is that model performance degrades with number of tokens used (even when well below the context window limit), and vector chunks are more prone to bloating the context window with unhelpful noise than more targeted search techniques. Claude Code doesn't do vector indexing, and neither does Zed. There aren't any rigorous studies comparing these tools, but you can find plenty of anecdotes of people preferring the output of Claude Code and/or Zed to Cursor's, and search technique is certainly a factor there!
- bryanlarsen 1y agoSounds like you're the exception rather than the rule. I've never seen a project with tens of thousands of files worth of accurate documentation. Any project that has that much documentation the majority of it is outdated and/or wrong. Some of it is still useful, but only in a historical context. The code is the authoritative reference.
- behnamoh 1y agoI never had good experience with RAG anyway, and it felt "hacky". Not to mention most of it basically died when most models started supporting +1M context. LLMs are already stochastic. I don't want yet another layer of randomness on top.
- WaltPurvis 1y ago>Not to mention most of it basically died when most models started supporting +1M context. Do most models support that much context? I don't think anything close to "most" models support 1M+ context. I'm only aware of Gemini, but I'd love to learn about others.
- fkyoureadthedoc 1y agoGPT 4.1 / mini / nano
- consumer451 1y agoAs the context grows, all LLMs appear to turn into idiots, even just at 32k! > We evaluate 12 popular LLMs that claim to support contexts of at least 128K tokens. While they perform well in short contexts (<1K), performance degrades significantly as context length increases. At 32K, for instance, 10 models drop below 50% of their strong short-length baselines. Even GPT-4o, one of the top-performing exceptions, experiences a reduction from an almost-perfect baseline of 99.3% to 69.7%. https://news.ycombinator.com/item?id=44107536 https://news.ycombinator.com/item?id=44107536
- rs186 1y agoThis paper is slightly outdated by LLM model standards -- GPT 4.1 or Gemini 2.5 haven't been released at that time.
- consumer451 1y agoYes, I mentioned that in the comment in the linked post. I wish someone was running this methodology as an ongoing project, for new models. Ideally, isn't this a metric that should be included on all model cards? It seems like a crucial metric.
- cdelsolar 1y agoCline is the most impressive agentic coder tool I’ve used and it seems to be getting better. I’ve learned to work with it to the extent where I can plan with it for 10-15 minutes, set it loose on my codebase, go get lunch, and then its diff is almost always completely on the money. You should commit often for those rare cases where it goes off the rails (which seems to happen less frequently now). Using Gemini 2.5 pro is also pretty cheap, I think they figured out prompt caching because it definitely was not cheap when it came out.
- atonse 1y agoI've always wondered... Making agents edits (like vibe coding), all the tools I've tried (Cursor, Zed, VSCode) are pretty equal since most of the brains are in the underlying models themselves. But the killer app that keeps me using Cursor is Cursor Tab, which helps you WHILE you code. Whatever model they have for that works beautifully for me, whereas Zed's autocomplete model is the last thing that keeps me away from it. What do Cline users use for the inline autocomplete model?
- nlh 1y agoI use Cline within Cursor — best of both worlds!
- atonse 1y agoWhat's the benefit? If you're paying $20/month for cursor you already get all the agentic coding as part of it.
- nlh 1y agoCursor changed their pricing recently and now charge a 20% markup on LLM API calls to use their "Max" models (which from what I gather are the full extent of the LLM context windows you get in the API anyway). I also don't love that Cursor generally plays "context compression" games since they have an incentive to keep their costs minimal. I just don't love any of these tools that try to be a bit too smart as a middleman between you and the LLM (where smart is often defined as 'try to save us the most money or be maximally efficient without the user noticing'). Cline also tries to be smart, but it's all for the benefit of the user. I like the transparent pricing -- you bring your own API key so you're paying the underlying API costs without a middle man markup. Am I being pennywise and should I just use Cursor directly? Maybe...but I've found my Cline results to be generally better for the more complex queries.
- esafak 1y ago"We Don't Dynamically Index Your Codebase So We Recan It with Every Query". Wasting time and tokens like this is not something to brag about. If indexing is so hard maybe someone should start a company just to do that, like https://news.ycombinator.com/item?id=44097699 https://news.ycombinator.com/item?id=44097699
- nico 1y agoThey could still RAG the AST and just use different chunking strategies It doesn’t seems like what they are doing necessarily replaced RAG, even if it can The times I’ve implemented RAG, I’ve seen an immediate significant improvement in the answers provided by the model Maybe they need some metrics to properly assess RAG vs no-RAG
- rtuin 1y agoTotally irrelevant on the subject, but the screen recording in the article caught my attention: what tool does one use to create the screen recording with zoom and mouse tracking?
- randomchars 1y agoThe most popular one is Screen Studio[0], but there are a few alternatives there, like Tella[1]. [0]: https://screen.studio/ https://screen.studio/ [1]: https://landingpage.tella.com/ https://landingpage.tella.com/
- flashblaze 1y agoSince I use Windows and Screen Studio is Mac only, I tried Tella and can definitely vouch for it. (I am on their free trial though)
- vunderba 1y agoScreen Studio is fantastic and unlike a lot of other commercial screen recorders has a one-time purchase cost (though you can also pay monthly).
- NitpickLawyer 1y agoEh... I'm not convinced. I like cline, I've been using it here and there and I think it found a good mix between "vibesus take the wheel" and "hey, I'm still here and I enjoy doing this". I was particularly surprised that it worked pretty well with local models. A lot of that is on the model (tested w/ devstral) but a lot of it is on the cradle (e.g. aider is great at what it does, but local model support is hit and miss). First, like some other comments have mentioned RAG is more than result = library.rag(). I get that a lot of people feel RAG is overhyped, but it's important to have the right mind model around it. It is a technique first. A pattern. Whenever you choose what to include in the context you are performing RAG. Retrieve something from somewhere and put it in context. Cline seems to delegate this task to the model via agentic flows, and that's OK. But it's still RAG. The model chooses (via tool calls) what to Retrieve. I'm also not convinced that embedding can't be productive. I think nick is right to point out some flaws in the current implementations, but that doesn't mean the concept in itself is flawed. You can always improve the flows. I think there's a lot to gain from having embeddings, especially since they capture things that ASTs don't (comments, doc files, etc). Another aspect is the overall efficiency. If you have somewhat repetitive tasks, you'll do this dance every time. Hey, fix that thing in auth. Well, let's see where's auth. Read file1. Read file2. Read fileN. OK, the issue is in ... You can RAG this whole process once and re-use (some) of this computation. Or you can do "graphRAG" and do this heavy lifting once per project and have AST + graph + model dump that can be RAGd. There's a lot of cool things you can do. In general I don't think we know enough about the subject, best practices and useful flows to confidently say "NO, never, nuh-huuh". I think there might be value there, and efficiencies to be gained, and some of them seem like really low hanging fruit. Why not take them?
- avereveard 1y agoat some point they will move from scanning files to scannign the AST and then token consumption will be greatly reduced by default, the challenge is that then you need something generic enough like tree-sitter to reduce the monumental effort of integrating a number of parsers.
- layer8 1y ago
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- wejick 1y agoI noticed that Sonnet 4 likes to use code search tool in cursor. Probably giving model option of tool to use is not bad thing to do.
- k__ 1y agoCursor does it. Cline doesn't. Aider goes the middle way with repo maps. Let's see what works best.
- bryanlarsen 1y agoWhat's the difference between Aider's repo map and the Cline AST? Sounds like a small difference in implementation than a difference in concept.
- k__ 1y agoI think, the repomap is an AST that doesn't go down all the way.
- wiradikusuma 1y agoWhen I'm in the middle of a conversation with AI, sometimes I like to change the code immediately ("Oh that's wrong, let me fix that first"). Does it mess the context? Or I need to close/Ctrl+C and reopen?
- k__ 1y agoAs far as I know, Aider uses the latest content of the file, each time you ask something. Btw. You can also trigger Aider via comments. This way you can mix it with your changes immediately. https://aider.chat/docs/usage/watch.html#ai-comments https://aider.chat/docs/usage/watch.html#ai-comments
- therealmarv 1y agoI would even classify aider a different way because it avoids what the blog posts is talking about (or moves the responsibility more to the human). In aider you can manually define or basically override which files are important for your context and for the LLM to know. With 1M context windows that's like a no brainer (except for extremely massive projects). I mean the repo map truly helps but I compare it with like driving a manual car... you shift the gears yourself by selecting the relevant files yourself and not your "automatic car"/AI code assistant for you like on cursor, cline, roo, claude code etc.
- ramoz 1y agoI kept wondering why Cursor was indexing my codebase, it was never clear. Anyway context to me enables a lot more assurance and guarantees. RAG never did. My favorite workflow right now is: - Create context with https://github.com/backnotprop/prompt-tower - Feed it to Gemini - Gemini Plans - I pass the plan into my local PM framework - Claude Code picks it up and executes - repeat
- anukin 1y agoHow does this work? It’s not clear how context is used to plan by Gemini then the plan is fed to local framework. Do I have to replan every time context changes?
- woah 1y agoThey use a tool like the one they linked to put all their files into one file that they give to gemini. Then they put the plan into their "PM framework" (some markdown files?) to have Claude Code pick tasks out of.
- greymalik 1y agoCan you give an example of a local PM framework? What happens in this step - ticket creation?
- olejorgenb 1y agoI've been wondering when someone would finally use the actual code structure to do RAG. It seems like such an obvious, if somewhat harder (at least if you need to support many languages), approach. The vector/keyword based RAG results I've seen so far for large code bases (my experience is Cody) has been quite bad. For a smaller projects (using Cursor) it seems to work quite well though.
- arthur-st 1y agoAider has been doing that for a long time now, it was the first project to do this afaik.
- srigi 1y agoThe most funny thing is how synchronicity worked its magic: Roo Code experimental code indexing using vector DB dropped 3 days ago. Theire using Tree-sitter (the same as Aider) to parse sources into ASTs and do vector embedding on that product, instead of plaintext. https://news.ycombinator.com/item?id=44117455 https://news.ycombinator.com/item?id=44117455
- izabera 1y agothe third point is applicable to a number of tools and systems, but who would claim that using git doubles your security surface?
- jjani 1y agoThe security argument is a valid one, as long as the prompts aren't passing through Cline's servers but instead directly sent to the LLM providers. If they go through an intermediary step, it's a pretty pointless difference. Yet it's very hard to make money off of a coding assistant where the prompts don't pass through their servers in one way or form. Cline is for-profit and currently their only monetization is to get users to use their credits system, meaning prompts go through them. In other words, if Cline is to succeed and monetize you, the security advantage sounds questionable. This is a hilariously obvious LLM sentence by the way: > Your codebase isn't just text – it's your competitive advantage When creating articles aimed at LLM power users (which this one is), just have a human write it. We can see through the slop. Come on, you're VC backed, if you were bootstrapping I wouldn't even be calling this out. The other arguments I used to agree with - compression and RAG means loss of quality, increasing context windows and decreasing prices means you should just send a lot of context. Then I tried Augment and their indexing/RAG just works, period, so now I'm not convinced anymore.
- layer8 1y ago> This is a hilariously obvious LLM sentence by the way: > > Your codebase isn't just text – it's your competitive advantage An LLM would have correctly used an em dash, not an en dash. ;)
- jjani 1y agoThis is so well-known by now that replacing those is tablestakes :) The ".. isn't just A - it's B" isn't yet to the greater public. This pattern is so prevalent that in any decent LLM business content generation product you're forced to hardcode avoidance/removal of that phrase, otherwise it's bound to show up in every article.
- never_inline 1y agoEven cline documentation seems to be slop generated.
- WhitneyLand 1y agoI generally agree with the article and the approach given practical constraints, however it’s all stop gap anyway. Using Gemini 2.5’s 1MM token context window to work with large systems of code at once immediately feels far superior to any other approach. It allows using an LLM for things that are not possible otherwise. Of course it’s damn expensive and so hard to do in a high quality way it’s rare luxury, for now…
- loandbehold 1y ago1 million tokens is still not enough for real life codebases (100Ks to millions loc)
- simonklee 1y agoAnd it's obviously expensive use this approach.
- orbital-decay 1y agoIt's always a tradeoff, and most of the time chunking and keeping the context short performs better. I feed long context tasks to each new model and snapshot just to test the performance improvements, and every time it's immediately obvious that no current model can handle its own max context. I do not believe any benchmarks, because contrary to the results of many of them, no matter what the (coding) task is, the results start getting worse after just a couple dozen thousand tokens, and after a hundred the accuracy becomes unacceptable. Lost-in-the-middle is still a big issue as well, at least for reasoning if not for direct recall - despite benchmarks showing it's not. LLMs are still pretty unreliable at one-shotting big things, and everything around it is still alchemy.
- crop_rotation 1y agoAfter trying cline,aider,codex, and what not, I feel claude code is just so so better than all of them. e.g It takes much much fewer prompts to be able to do the same thing compared to cline. tbh I am not sure how cline will compete against something like Claude code due to the resource/capability imbalance. Does anyone else have a different experience?
- loandbehold 1y agoSame experience. Claude Code is much better than all other tools. I suspect Claude Code uses some private features of Claude model that's not available to other tools. It only makes sense that Anthropic will develop their model in conjunction with the tool to produce best result.
- XenophileJKO 1y agoI really felt like Claude Code would benefit greatly from a similar structural map. The little map it made in the Claude.md is insufficient. When the code base grows or you add a more componentized approach, Claude Code started favoring a locality bias which increases the architectural entropy a LOT.
- weitendorf 1y agoMy company is working on a similar tool to Cline, and we had an intern project last summer to create a tool for AI-for-coding RAG: https://github.com/accretional/semantifly https://github.com/accretional/semantifly Ultimately we came to a similar conclusion and put the project on ice: chunking and vector similarity search are fundamentally not great approaches for code RAG. I don't really agree with most of Cline's other assertions because those are pretty easy to work around (I suspect they may just be content slop?). It's pretty easy to vectorize and re-chunk code as you change it as long as you have a fixed way of encoding vectors, and you can also generate indices or do more expensive changes to encoding as part of your CI/CD. Indices can be stored in your git repo itself so theres not really a security risk either. Our tool made this pretty easy to do. An index can literally just be a file. No, the problem is really that vector search (especially with a-kNN) is fundamentally a fuzzy/lossy kind of search, and even when the vector search part works perfectly, your choice of k will usually either include more information than you intend or miss information that didn't meet the top-K threshold. And naive implementations that don't add additional context or are unconditionally searching based on your prompt will probably bias or confuse your model with code that might seem relevant but isn't (eg if you are trying to debug deployments, you include a bunch of your code related to deployments, but the bug is in the application code, and also you have a bunch of deployment scripts in your codebase that are for different platforms and are extra irrelevant). It's significantly more work to make a vector based approach to code-RAG actually good than it is to get a naive implementation working. We have a different approach to Cline but it's similar in that it uses things like references and how the developer actually understands their codebase.
- 3cats-in-a-coat 1y agoThis seems like a marketing piece, very poorly justified. First, large context models essentially index their context as it grows bigger, or else they can't access the relevant parts of it. However it can't be as comprehensive as with RAG. There is also nothing that makes navigating the context from point to point easier than with RAG. It seems they're trying to convince people of their superiority, but it's BS, so they're trying to bank on less knowledgeable customers. Indexing is essentially a sorted projection of a larger space, based on the traits and context you care about. There's no magical way for a context to be more accessible, if it has no such semantical indexing, implicit or explicit. Also RAG doesn't mean you can't embed AST and file structure as a concern. A vector is a set of dimensions, a dimension can be literally anything at all. AI is about finding suitable meaning for each dimension and embedding instances in that dimension (and others in combo).
- cat-whisperer 1y agoWhat about doing something just-in-time? I'm just speculating, but what if cline leverages the LSP (for instance, rust-analyzer) to track the function chain and build a tree-like context of the codebase—not the entire codebase, but just specific blobs of code? Would that work?
- esperent 1y agoLSP generally uses an AST representation of the code under the hood. And an AST representation is generally larger - often much larger - than the original code. So I'm not sure what the benefits of this would be compared to just loading the actual code into the context.
- silverlake 1y agoHave you guys at Cline considered using LLMs to create summaries of files and complex functions? Rather than read a 500 line function, feed it a short comment on what the function is doing. I'd like to use a local LLM to create summaries at every level: function, file, directory. Then let the LLM use that to find the right code to read. This is basically how I navigate a large code base.
- dpe82 1y agoI've just used Cline to produce files like that, and then later when starting a task in plan mode I tell it to read those files to get a sense of the project's structure. I also tell it to update them as necessary after whatever task we're doing is finished.
- noman-land 1y agoSo you're effectively keeping two copies of the codebase but the second copy is written in prose?
- zentara_code 1y agoWould it double your codebase? Do you think it would work for a large codebase?
- dpe82 1y agoNot anywhere close. It's basically just maintaining a simple descriptive index the model can later use to decide what files it needs to read given the task you've given it.
- jdoliner 1y agoDoes anybody else see high CPU and GPU utilization on this site with a process called ClineBot?
- nkmnz 1y agoDoes cline expose this retrieval mechanism to the user? If yes, could I randomly chose points in my codebase, ask cline to do its “intelligent walk” and store the results in a graph database for graph-RAG?
- nsonha 1y agojust coincidentally I saw an excerpt of an recent interview from Swyx when someone made this exact same point. Can't find it but wonder if that's the author and anyone has a link?
- nchmy 1y agoI cant help but think this article was published as a direct response to Cline's (arguably superior) fork, Roo Code, releasing an experimental Codebase Indexer in the past week... https://docs.roocode.com/features/experimental/codebase-indexing https://docs.roocode.com/features/experimental/codebase-inde... Augment Code's secret sauce is largely its code indexer, and I find it to be the best coding agent around.
- tonipetrov91 1y agoIsn't this what is called CAG (context augmented generation) these days? 1. Although I think RAG for code is nonsense, CAG seems to be very expensive even with cachig - imagine a huge code base. There should be a more efficient option. 2. How about indexing documentation - RAG should be okay there?