JetBrains MPS is a development environment for creating domain-specific languages, which are programming languages designed for a particular field or task. It provides editors with features such as completion, semantic checks, and type checking, and can generate code in languages including Java and XML.
Borrowing it
Nothing to install: this file belongs to JetBrains/MPS. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/JetBrains/MPS/master/.agents/skills/bugfix-workflow/SKILL.mdgit clone --depth 1 https://github.com/JetBrains/MPSWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/jetbrains/mps/bugfix-workflow)<a href="https://agentmods.dev/skills/jetbrains/mps/bugfix-workflow"><img src="https://agentmods.dev/badge/skills/jetbrains/mps/bugfix-workflow/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/jetbrains/mps/bugfix-workflow"><img src="https://agentmods.dev/badge/skills/jetbrains/mps/bugfix-workflow.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00099 | $0.04109 |
| Opus 5.5 | $0.00040 | $0.01644 |
| Sonnet 5.5 | $0.00020 | $0.00822 |
| Haiku 4.5 | $0.00010 | $0.00411 |
Grade A, and why
bugfix-workflow scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 195 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MPS Bugfix Workflow
You are guiding a structured bugfix process for the JetBrains MPS project. Follow each phase in order. Never skip phases or start implementation before the user gives an explicit command to do so.
The issue to fix is the YouTrack ID supplied with this request ($ARGUMENTS when the host substitutes it).
Always-on project rules apply throughout: AGENTS.md and .agents/git.md, conventions.md, tools.md, workflow.md, quality-gates.md. This skill is only the bugfix process and a few stricter overlays — it deliberately does not restate what other skills own.
Required companion skills — load both in Phase 0, before any analysis:
| Skill | Owns | Why it is mandatory here |
|---|---|---|
mps-mcp-workflow |
the MPS MCP contract: tool naming and prefixes, project resolution, node editing, model validation, and the index of every other mps-* skill |
a fix that looks like plain Java routinely turns out to live in a model, aspect or generator; without this skill you will guess tool names and misjudge whether MPS is even reachable |
teamcity-cli |
TeamCity CLI syntax | Phase 7 decides whether the fix is done |
Route from mps-mcp-workflow into the specific mps-aspect-* / mps-language-* skill for whatever the fix turns out to touch.
Critical Directives
- Never start implementing code before the user gives explicit approval. Wait for "implement", "go ahead", "start coding", "do it", etc.
- Never skip Phase 0 preflight. Missing YouTrack MCP, IDEA MCP, or the platform project changes how you should proceed; surface the gap before touching code.
- A fix is not done until TeamCity is green. Local builds and tests are necessary but not sufficient. The definitive confirmation is the TeamCity feature-branch chain for the pushed branch: all tests must pass, or every remaining failure must be proven pre-existing on the base branch. Never report the task complete on local evidence alone, and never predict the outcome of a build that is still running. See Phase 7 and
references/teamcity-validation.md. - The only other legal ending is an explicit
not validated — <reason>verdict (the user declined the push, TeamCity is unreachable, …), naming what was and was not run. Silence, or local-only evidence presented as success, is never acceptable.
What ships with it
9 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- references/branch-naming.md 1.6 KB
- references/completion-comment.md 1.4 KB
- references/explore-prompts.md 1.2 KB
- references/issue-fields.md 1016 B
- references/platform-prompt.md 543 B
- references/review-checklist.md 992 B
- references/root-cause-template.md 608 B
- references/teamcity-validation.md 7.4 KB
- references/version-prompt.md 800 B
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 195 lines · 99 tokens per session scan A 02add1b58ac9
bugfix-workflow is a skill published in the GitHub repository JetBrains/MPS (1,666 stars, last pushed yesterday), licensed Apache-2.0. It adds 99 tokens to every session and 4,109 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-12.
bugfix-workflow compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| bugfix-workflowJetBrains/MPS | Skill | 1.7k | yesterday | Apache-2.0 | A | 99 | Claude Code |
| git-advanced-workflowswshobson/agents | Skill | 42k | yesterday | MIT | A | 54 | Claude Code |
| agent-merge-conflict-arbiterNousResearch/hermes-agent | Skill | 261k | yesterday | MIT | A | 19 | Claude Code, Codex |
| enable-check-includes-strictchromium/chromium | Skill | 25k | yesterday | BSD-3-Clause | A | 70 | Claude Code, Codex |
| resolve-handoffomnigent-ai/omnigent | Skill | 11k | today | Apache-2.0 | A | 23 | Claude Code, Codex |
| reproduce-and-fix-issuesbacknotprop/pstack | Skill | 3.7k | yesterday | MIT | A | 48 | Claude Code, Cursor |
| cy-orquestrate-issuecompozy/compozy | Skill | 2.8k | yesterday | MIT | A | 94 | Claude Code, Codex |