Legacy Migration Planner
tech-leads-club/agent-skills
Produces evidence-based migration plans using the Strangler Fig pattern for monolith splits, rewrites and framework upgrades, without implementing them.
Migrates legacy page-navigation breadcrumbs to @sentry/scraps/breadcrumbList and the required typed title on TopBar.Slot name="breadcrumbs".
OfficialCustom licenceAuto-check passed
Install Migrate Breadcrumb List
$ npx skills add getsentry/sentry --skill migrate-breadcrumb-list -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install getsentry/sentry migrate-breadcrumb-list --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/getsentry/sentry.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/migrate-breadcrumb-list .claude/skills/migrate-breadcrumb-list && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "migrate-breadcrumb-list" agent skill from https://github.com/getsentry/sentry/tree/master/.agents/skills/migrate-breadcrumb-list into .claude/skills/migrate-breadcrumb-list/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migrate-breadcrumb-list", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/getsentry/sentry/tree/master/.agents/skills/migrate-breadcrumb-listType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add getsentry/sentry --skill migrate-breadcrumb-list -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install getsentry/sentry migrate-breadcrumb-list --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/getsentry/sentry.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/migrate-breadcrumb-list .agents/skills/migrate-breadcrumb-list && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "migrate-breadcrumb-list" agent skill from https://github.com/getsentry/sentry/tree/master/.agents/skills/migrate-breadcrumb-list into .agents/skills/migrate-breadcrumb-list/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migrate-breadcrumb-list", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add getsentry/sentry --skill migrate-breadcrumb-list -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install getsentry/sentry migrate-breadcrumb-list --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/getsentry/sentry.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/migrate-breadcrumb-list .cursor/skills/migrate-breadcrumb-list && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "migrate-breadcrumb-list" agent skill from https://github.com/getsentry/sentry/tree/master/.agents/skills/migrate-breadcrumb-list into .cursor/skills/migrate-breadcrumb-list/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migrate-breadcrumb-list", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/getsentry/sentry.git --path .agents/skills/migrate-breadcrumb-list--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add getsentry/sentry --skill migrate-breadcrumb-list -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install getsentry/sentry migrate-breadcrumb-list --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/getsentry/sentry.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/migrate-breadcrumb-list .gemini/skills/migrate-breadcrumb-list && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "migrate-breadcrumb-list" agent skill from https://github.com/getsentry/sentry/tree/master/.agents/skills/migrate-breadcrumb-list into .gemini/skills/migrate-breadcrumb-list/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migrate-breadcrumb-list", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install getsentry/sentry migrate-breadcrumb-listInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add getsentry/sentry --skill migrate-breadcrumb-list -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/getsentry/sentry.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/migrate-breadcrumb-list .github/skills/migrate-breadcrumb-list && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "migrate-breadcrumb-list" agent skill from https://github.com/getsentry/sentry/tree/master/.agents/skills/migrate-breadcrumb-list into .github/skills/migrate-breadcrumb-list/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migrate-breadcrumb-list", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add getsentry/sentry --skill migrate-breadcrumb-list -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install getsentry/sentry migrate-breadcrumb-list --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/getsentry/sentry.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/migrate-breadcrumb-list .opencode/skills/migrate-breadcrumb-list && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "migrate-breadcrumb-list" agent skill from https://github.com/getsentry/sentry/tree/master/.agents/skills/migrate-breadcrumb-list into .opencode/skills/migrate-breadcrumb-list/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "migrate-breadcrumb-list", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
migrate-breadcrumb-list- GitHub stars
- 46k
- Token cost
- ~2.6k tokens
- SKILL.md length
- 1,139 words
- Files
- 5 (incl. references)
- Skills in repo
- 29
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Migrates legacy page-navigation breadcrumbs to @sentry/scraps/breadcrumbList and the required typed title on TopBar.Slot name="breadcrumbs".
- Works in 9 steps: Inspect the crumb builder, current… → Identify the current page name before… → Build the typed title using… → …
- Migrate breadcrumbs
- SKILL.md covers The transformation, Preserve page filters explicitly, API map and Per-page workflow, plus 3 more sections
- Calls pnpm
What it does
Migrate Breadcrumb List is an agent skill from getsentry/sentry, published by the product's own GitHub organization. Migrates legacy page-navigation breadcrumbs to @sentry/scraps/breadcrumbList and the required typed title on TopBar.Slot name="breadcrumbs". Use for "migrate breadcrumbs", "replace sentry/components/breadcrumbs", "BreadcrumbList.Title", duplicate page titles, or preserving page filters during breadcrumb migration. Not for event breadcrumbs, issue-detail timeline entries, or a redesign of Settings route assembly.
Its SKILL.md is about 2.6k tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including reference files (for example `SOURCES.md`, `references/call-site-inventory.md` and `references/tests.md`).
The repository describes itself as: Developer-first error tracking and performance monitoring.
When your agent uses it
- Migrate breadcrumbs
- Replace sentry/components/breadcrumbs
- BreadcrumbList.Title
- Duplicate page titles
Example prompts
- “breadcrumbs”
- “migrate breadcrumbs”
- “replace sentry/components/breadcrumbs”
- “/migrate-breadcrumb-list”
Workflow steps
9 steps, taken from the first numbered list in SKILL.md.
- Inspect the crumb builder, current title, conditions, and wrapper consumers. Use native search tools when available; otherwise use rg…
- Identify the current page name before building parent items. An existing typed title takes precedence. On older branches, inspect the…
- Build the typed title using references/title-item.md. Preserve editing, parent selection, navigation, and analytics behavior. Keep the…
- Build parent items with real destinations. Remove the current page from the trail. A category descriptor may need a real parent URL…
- Pass title and items to one TopBar.Slot name="breadcrumbs". Preserve conditions on parent rendering. For branch-dependent titles, let each…
- If a shared header owns the slot, remove its callers' wrapping slots in the same change. Do not nest slot-producing components inside…
- Remove empty Layout.Header or Layout.HeaderContent wrappers left holding only slots. Retain wrappers that still hold tabs or other visible…
- Delete only code made unused by the migration. Do not expand the shared title API to accommodate each legacy decoration. If requested UI…
- Verify changed behavior with the existing relevant tests, pnpm run typecheck, and .venv/bin/prek run -q --files . Read references/tests.md…
What it can do on your machine
Read from SKILL.md and the folder at commit 99b4c2b. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
pnpm
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use pnpm, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Migrate Breadcrumb List loads about 2.6k tokens when it runs, and up to ~7k if it reads all its reference files. Until then it costs about 110 tokens; SKILL.md has 1,139 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,139 words (~2,585 tokens).
“Migrate the requested file or view directory. If no target is supplied, inspect the remaining legacy importers and select a page-navigation call site.”
- name
- migrate-breadcrumb-list
Files
SKILL.md and 4 other files (references) in .agents/skills/migrate-breadcrumb-list of getsentry/sentry.
- SKILL.md
- SOURCES.md
- references/call-site-inventory.md
- references/tests.md
- references/title-item.md
Open the folder on GitHubat commit 99b4c2b
Compare with similar skills
Migrate Breadcrumb List next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Migrate Breadcrumb List this skillgetsentry/sentry | 46k | — | ~2.6k | Automated safety check: Pass | Custom licence | |
| Legacy Migration Plannertech-leads-club/agent-skills | 7k | — | ~1.8k | Automated safety check: Pass | CC-BY-4.0 | |
| Sentry Upgrade Migrationjeremylongshore/tons-of-skills-marketplace | 2.8k | — | ~3.7k | Automated safety check: Pass | MIT | |
| Reversible MigrationJuliusBrussee/caveman | 110k | 1 repos | ~196 | Automated safety check: Pass | Apache-2.0 | |
| Breadcrumbthedaviddias/Front-End-Checklist | 74k | — | ~423 | Automated safety check: Pass | MIT | |
| Database Migrationsaffaan-m/ECC | 275k | 4 repos | ~3k | Automated safety check: Pass | MIT |
Similar skills
Sentry Upgrade Migration
jeremylongshore/tons-of-skills-marketplace
Upgrade Sentry SDK versions and migrate breaking API changes.
Reversible Migration
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Implement reversible compatibility-safe transitions. Use for schema, data, API, protocol, configuration, or dependency migrations requiring rollback and…
Breadcrumb
thedaviddias/Front-End-Checklist
A skill your agent uses when auditing metadata, crawlability, structured data, or indexability related to Implement valid BreadcrumbList schema.
Database Migrations
affaan-m/ECC
Safe, reversible database migration patterns: forward-only production changes, expand-contract zero-downtime renames, concurrent indexes, batched backfills, and per-tool workflows for PostgreSQL…
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Şema değişiklikleri, veri migration'ları, rollback'ler ve PostgreSQL, MySQL ve yaygın ORM'ler (Prisma, Drizzle, Django, TypeORM, golang-migrate) arasında sıfır kesinti deployment'ları için…
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Questions about Migrate Breadcrumb List
What does Migrate Breadcrumb List do?
Migrates legacy page-navigation breadcrumbs to @sentry/scraps/breadcrumbList and the required typed title on TopBar.Slot name="breadcrumbs". Migrate Breadcrumb List is an agent skill from getsentry/sentry, published by the product's own GitHub organization.Slot name="breadcrumbs".
When should I use Migrate Breadcrumb List?
Migrate Breadcrumb List fits situations like: migrate breadcrumbs; replace sentry/components/breadcrumbs; breadcrumbList.Title; duplicate page titles.
How do I install Migrate Breadcrumb List in Claude Code?
Run `npx skills add getsentry/sentry --skill migrate-breadcrumb-list -a claude-code`. Or copy the skill folder (.agents/skills/migrate-breadcrumb-list in getsentry/sentry) into .claude/skills/migrate-breadcrumb-list in your project. Claude Code loads it when a task matches its description.
How do I install Migrate Breadcrumb List in Codex?
Run `npx skills add getsentry/sentry --skill migrate-breadcrumb-list -a codex`. Or copy the skill folder (.agents/skills/migrate-breadcrumb-list in getsentry/sentry) into .agents/skills/migrate-breadcrumb-list in your project. Codex loads it when a task matches its description.
Can I use Migrate Breadcrumb List in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add getsentry/sentry --skill migrate-breadcrumb-list -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/migrate-breadcrumb-list, .gemini/skills/migrate-breadcrumb-list, .github/skills/migrate-breadcrumb-list and .opencode/skills/migrate-breadcrumb-list in your project.
What does Migrate Breadcrumb List need to run?
Going by SKILL.md and its folder, Migrate Breadcrumb List needs the command-line tools its instructions call (pnpm).
Does Migrate Breadcrumb List access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Migrate Breadcrumb List safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Migrate Breadcrumb List use?
Migrate Breadcrumb List has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Migrate Breadcrumb List use?
About 2.6k tokens (SKILL.md is roughly 10k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 4.4k tokens, read only when the agent opens those files.
What are the alternatives to Migrate Breadcrumb List?
Skills that share tags, products or a category with Migrate Breadcrumb List: Legacy Migration Planner (tech-leads-club/agent-skills, 7k stars), Sentry Upgrade Migration (jeremylongshore/tons-of-skills-marketplace, 2.8k stars), Reversible Migration (JuliusBrussee/caveman, 110k stars) and Breadcrumb (thedaviddias/Front-End-Checklist, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Migrate Breadcrumb List?
getsentry (a GitHub organization, an official publisher) maintains it in getsentry/sentry, which has 45,505 GitHub stars. The repository holds 29 skills in this directory. The repository was last updated on October 8, 2026.
Source: getsentry/sentry on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.