165 points etoxin 14 hours ago 76 comments
slowmovintarget 14 hours ago | parent
It works fairly well, and it is definitely less heavy than SpecKit.
jeremyjh 13 hours ago | parent
Lately I've been using stock OMP and its close to the right balance but not quite enough of the brainstorming and spec maintenance built in. I've tried to layer some simple stuff on myself but with mixed results.
dmos62 6 hours ago | parent
CharlieDigital 13 hours ago | parent
Concepts links here: https://github.com/Fission-AI/OpenSpec/blob/main/docs-lab/gu...
All the docs here are the templates rather than the actual file (I presume: https://github.com/Fission-AI/OpenSpec/blob/main/docs/concep...)
Somehow not very confidence inspiring...
silvertab 13 hours ago | parent
TabishB 7 hours ago | parent
wyum 13 hours ago | parent
If you like this / SDD, I'd appreciate your feedback:
https://github.com/spekk-ai/spekk-cli
Similar iterative specs philosophy. Ours is a bit different because we focus on declarative specs and installable agent skills. We chose Go for simplicity and minimal requirements (single binary).
passive 13 hours ago | parent
sroerick 8 hours ago | parent
Ive wondered if I have too much complexity, and from time to time I do a "prompt astrology reset" where I get rid of all the extra cruft. I can't go without the spec sheets though.
wyum 5 hours ago | parent
On removing cruft: one of the key features of spekk is an "observer" agent role that is tasked with finding drift. On a production codebase, I run this daily in a sandbox. It pulls the latest changes and looks for specs that are mismatched from the implementation, preferring to look at specs and code that changed recently and prioritizing "major" drift events. The observer agent then opens a PR wkth its observations (markdown with YAML like the specs). It also posts a summary to Slack, but that's optional. The sandbox agent code is part of the spekk-cli codebase.
ulimn 3 hours ago | parent
You say this is your first time seeing openspec, but you've been working on a pretty similar project for a year now. Openspec and Speckit both seem to have similar (almost same?) goal as yours. Do you just jump into such a project as yours without worrying about others already existing?
I tend to overthink such stuff...
wyre 13 hours ago | parent
Why does it need to have an entire CLI?
iamjfu 13 hours ago | parent
wyre 11 hours ago | parent
Not trying to say that it's not useful, but it seems excessive and potentially bloated.
etoxin 11 hours ago | parent
jmathai 13 hours ago | parent
Last week, I gave a 471 line spec to implement a major feature and it didn’t flinch. I wrote about it here.
https://jaisenmathai.com/articles/sojourn-for-ios-was-45-one...
OutOfHere 11 hours ago | parent
jmathai 10 hours ago | parent
8cvor6j844qw_d6 13 hours ago | parent
There seems to be a spectrum from fluid, iterative workflows like OpenSpec to more up-front alignment and control like Matt Pocock skills.
Curious what people have settled on.
chrismarlow9 12 hours ago | parent
```
~/.config/opencode/AGENTS.md
~/.claude/CLAUDE.md
~/.codex/AGENTS.md
~/.copilot/copilot-instructions.md
~/.gemini/GEMINI.md
```
Define it as a graph and iterate. I use more tokens, but I can also use more tools without disruption. Delegating markdown to folders/smaller repos can solve the tokens/context issue.
kaurimu 11 hours ago | parent
Its design offers a compellingly simple surface for weaving natural-language intent into the codebase itself, without overcomplicating things:
---
Key Ideas
* Plain markdown: readable by humans, parseable by agents
* Wiki links connect concepts into a navigable graph
* // @lat: and # @lat: comments tie source code to specs
* lat check ensures nothing drifts out of sync
* lat search for semantic vector search across all sections
---
For me it strikes the right balance between structure and flexibility. It gives agents enough context-efficient grounding to reduce functional and architectural drift [2], while remaining malleable enough to evolve with new requirements.
Admittedly I haven't run any evals, and I'm sure there are even better systems out there... but if I still had the problem I was trying to solve when I found it, I wouldn't be talking about it right now.
Of course it's likely that my problem has only migrated to a higher order of complexity, but surfacing it again through building increasingly complex things is an interesting enough challenge in itself.
[1] https://github.com/vercel-labs/lat.md
[2] 100% auto-eliminating drift is an unrealistic goal -- that's where you come in.
honkycat 13 hours ago | parent
Easily my favorite spec driven development framework.
It scored really well in our internal evals as well.
I think it has the most sane ceremony and its model fits my mental model really well.
I've also been working on a TUI that will automatically generate "phases" with each one being a openspec spec.
I would highly recommend trying out SpecDriven development. I found it to be the most productive way to work with LLMs for larger tasks, and I have found that it improves performance on larger tasks.
To me, this is where LLMs should go. Collaborating on shared documents that serve as a contract that then gets evaluated post-implementation
I've made multiple attempts to write domain-specific languages for LLMs to use to guide software architecture so that I can have higher-quality software architecture and also so that it can communicate ideas to me in a more terse way.
One thing that I think LLMs are lacking right now is information density. I'm a guitarist, and I like this game called Rocksmith, but I think that its user interface kind of sucks. It's fun to play along with the songs, and it's fun that it scores me on the songs and gamifies playing guitar. For dense notes, the user interface just isn't very good.
That kind of made me think more about information density. A sheet of notes is very dense, but it takes a little more time to process. Guitar tablature is slightly less dense, but I think it strikes a better balance between treble clef and Rocksmith. Really, I'd rather have all three of those presented to me.
This is really where I'd like to go with how I'm writing software now. LLMs: I'd love to be able to just create a specification that is very dense and describes domain-driven design concepts to the LLM, and then have a workflow that will do adversarial review to evaluate those concepts after implementing a phase.
This also kind of solves part of the problem with design decisions and artifact storage and all those things that we kind of see LLMs scatter around a codebase. If it exists in the spec, then it can be referenced later, and you can document changes, etc. Also, if you do the spec right, it could be language-agnostic.
Mugshelf 12 hours ago | parent
sheepscreek 12 hours ago | parent
scosman 12 hours ago | parent
I use this skill and it makes the specing process progressive. Human driven for the "what", 50/50 for higher level technical planning, only where it has questions in the low level details: https://github.com/scosman/vibe-crafting
virgil_disgr4ce 12 hours ago | parent
alexjplant 11 hours ago | parent
OpenCode and various open models do not exhibit this tendency nearly as much in my experience. My recent experiences with GPT-5.6 were also very positive in this regard. Alas for regulatory reasons this stack is a non-starter at $DAYJOB so I'm stuck working around Anthropic's capacity optimizing shenanigans.
Wazzymandias 11 hours ago | parent
This is absolutely not true
verdverm 11 hours ago | parent
feels less like planning and more like throwing spaghetti at the wall the moment ambiguity emerges, I really hope the next batch dials it back
thesmtsolver2 10 hours ago | parent
vintermann 4 hours ago | parent
jmathai 10 hours ago | parent
crossroadsguy 10 hours ago | parent
postpriorx 4 hours ago | parent
loveparade 9 hours ago | parent
visarga 8 hours ago | parent
philipp-gayret 5 hours ago | parent
evaltoken 12 hours ago | parent
grohan 11 hours ago | parent
recroad 11 hours ago | parent
nullbio 11 hours ago | parent
trollbridge 11 hours ago | parent
broodbucket 10 hours ago | parent
nullbio 1 hour ago | parent
Most of the time all you need is a throwaway md file to compensate for context loss and so you can loop on a spec across compaction. Once you have the spec implemented, there's usually no reason to keep it around. The code becomes the spec.
For hard constraints you have AGENTS.md, or put it in another md file. Why do I need additional software for this?
esafak 11 hours ago | parent
open-paren 10 hours ago | parent
i find a small, human written spec to be much more effective than these large spec documents.
the idea is that you iterate with your agent to write the spec, you implement, then eventually that spec gets merged into a "spec corpus" that describes all the behavior of the repository. but i don't think that prose can ever enumerate all the behaviors required of code, nor should it. the spec almost immediately becomes out of date.
nonethewiser 9 hours ago | parent
TabishB 7 hours ago | parent
Either ways, we're open to feedback and I'm happy to have a conversation. Feel free to email me at tabish@openspec.dev to set something up.
QwenGlazer9000 1 hour ago | parent
pramodbiligiri 8 hours ago | parent
gps372 8 hours ago | parent
Also, this looks like something which leadership level folks need to adopt first and then somehow it needs to trickle down to PI planning and sprint planning. Would like to hear someone's experience on how this has got adopted in their org.
jochem9 7 hours ago | parent
Basically the flow proposal -> design -> specs -> tasks gives you and AI a method to build context on what you want to achieve. In a way you're just creating a plan/big prompt that is structured in such a way that they start stacking on each other.
The power is that you do a lot of upfront thinking. In my team we then share it with a colleague who will review it through a PR. After that implementation is usually hands off. At the end there is a skill to verify the change against specs. I do still review the code myself too.
I guess if you work in a task oriented environment this will not work as well, as you'd lack/don't care about the business context. I'd like to think that most software development does not happen like this, but is done by engineers who actually understand why something is needed and take that into account when designing and building the solution.
gps372 7 hours ago | parent
This is the best part of this spec, but we have found from our experience that though upfront thinking changes has a lot of merits and adds clarity and alignment upfront, but it changes bit by bit in every meeting and before you know your specs are not aligned with general consensus in the team. If your team is large enough, then it gets very difficult to own the task of constructing alignment between your principal-artifacts and your evolved under-current of understanding.
If you check my submissions (https://news.ycombinator.com/submitted?id=gps372), I have written whole set of articles on the myths of how easy it is keep the understanding consistent.
I would still say that if you are working on a platform and if your engg team size if anything more than 25-30, then this spec must be adopted from top-down and not bottoms up. Bottom level engineers usually don't have the level of consistent exposures (as and when they socialize and evangelize their platform) which top level engineers have.
TabishB 7 hours ago | parent
gps372 7 hours ago | parent
Please note that I can already see that github repo has 68k+ stars. So popularity is not in question, just the viability and consistency of adoption across different scenarios.
cg-enterprise 6 hours ago | parent
I also ended up doing my own thing mainly to address several omissions in the existing frameworks (for SDD I prefer to use Superpowers and/or Matt Pocock's skills):
1. Artifact staleness and tracking - if you have a structure around starting with something like an ADR, common patterns for the whole repo etc., it's super hard to keep track of and actually keep it up to date. You make a strong early decision in an ADR and realize that you have to change it later on, or diverge. These changes get rarely properly recorded.
2. Review loop - Same model review isn't enough, I want bunch of models bouncing off each other, whilst still using my subscription and not API.
3. Feature creep and deferral tracking - it happens a lot that you encounter either during review or one of the validation phases that you also need to implement x, which is not covered by the original spec. There are several options to handle that, with the key that all those decisions need to be tracked and at some point decided by a human.
4. Custom workflow with governance - I have my own preferred SDLC if you can call it that, which includes rounds of agentic review of spec, before manual approval gate, review loop with certain specification depending on the codebase, feature size, deferral rules.
5. Ceremony based on context - Because it would happen that some of the ceremony would get in the way at some points (like producing a 100+ loc spec for 10loc change) I ended up basically developing a flow to decide whether a feature actually needs the full ceremony (full lane) or we can simply use the native plan feature (fast lane), so that I don't have to go through the whole ordeal of steps, when I need a tiny change.
I forked this code and added bits that matched my flow and it works out pretty well https://github.com/nutthouse/tutti
chandlerklein 6 hours ago | parent
dmos62 5 hours ago | parent
It's also worth noting that SDD is such a wide variety of approaches that the term on its own says very little. For example, SpecKit and SpecDD are both very capable SDD frameworks, yet they have only minimal overlap: SpecDD describes system components (with emphasis on boundaries), while SpecKit is a fairly advanced process for changing specs.
nicotejera 4 hours ago | parent
nullbio 1 hour ago | parent
nicotejera 41 minutes ago | parent
twen_ty 4 hours ago | parent
In my experience, spec drift is the main reason why none of these tools work. Maybe they work for one shot greenfield feature generation but in a large, multi developer long lived code bases, specs rot and end up being more pain than they are worth.
twohaibei 4 hours ago | parent
postpriorx 4 hours ago | parent
spinningslate 2 hours ago | parent
1. Lack of closed loop between the "spec" and working code (your spec rot point). The Rational Unified Process(RUP) was a grossly inefficient, heavily manual undertaking. Mapping between artefacts - e.g. "Platform Independent Models" and "Platform Specific Models" was a manual, largely heuristic based approach. As a consequence the models were not generally kept up to date as the project evolved.
2. User experience mismatch. Developers were asked to create diagrams instead of writing code. Tool usability was poor ("write code with a mouse") and the artefacts didn't fit well with necessary tools like diffing and source code control (try diffing an xml file textually).
Coding agents have some potential for alleviating (1) in that they can read the result code and, at least to some extent, ensure spec and code are in sync.
(2) is more open. Some users - those proportionally more interested in solving the problem than designing/writing code - are more comfortable with natural-language-based specs and exploration. Those more experienced/comfortable with code will likely see those specs more akin to UML diagrams: a distraction from the real thing.
0x445442 50 minutes ago | parent
p_kuni 9 minutes ago | parent
whinvik 3 hours ago | parent
And my issue is always, how do I review so many files. Is the purpose just to go from 1 requirement prompt to so many spec files? How do I know the specs actually reflect the requirement?
I always feel I come away from projects like this even more confused.
ricardobeat 3 hours ago | parent
What I'd like to see is what it is, how and why it works, ideally backed by some benchmarks. Otherwise it looks like just another pile of skills with unknown outcomes.
mafro 2 hours ago | parent
Recently, I've completely ditched the specification part. I found they just weren't useful over the longer term. I used an LLM to assess in both directions whether the code matched the specs and whether the specs matched the code. On both software projects this came out with huge divergence from spec to code.
Basically the old theory is true - the code IS the specification.
What I did find very useful and have retained is the process flow. Create a proposal, review the proposal, implement, review the code. Also useful was building and maintaining ADRs and invariant logs for where a unit test cannot be made to verify behaviour. The process and the ADRs, unit test, invariant log all help the software stay coherent as the LLM churns on it over many unconnected contexts.
polycaster 1 hour ago | parent
mactavish88 1 hour ago | parent
sieve 1 hour ago | parent
The spec is whatever I write by hand. The code is what the LLM writes for me. The spec could be anything depending on how much detail you want.
The problem with the "code IS the spec" in the age of LLMs is that they will change stuff without telling you while hitting their immediate goal. Six months ago, I used to review every single change. Now I get the LLM to audit the code to compare against the spec. Any divergence means one of two things:
- either I have to update the spec, or
- the LLM has to update the code.
threatofrain 46 minutes ago | parent