Technical Analyst
tradermonty/claude-trading-skills
This skill should be used when analyzing weekly price charts for stocks, stock indices, cryptocurrencies, or forex pairs.
Look up Y Combinator companies and batches from the public yc-oss API, a static JSON dataset refreshed daily: company profiles, batch rosters (e.g.
Install Yc Reader
$ npx skills add himself65/finance-skills --skill yc-reader -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install himself65/finance-skills yc-reader --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/himself65/finance-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/social-readers/skills/yc-reader .claude/skills/yc-reader && 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 "yc-reader" agent skill from https://github.com/himself65/finance-skills/tree/main/plugins/social-readers/skills/yc-reader into .claude/skills/yc-reader/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "yc-reader", 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/himself65/finance-skills/tree/main/plugins/social-readers/skills/yc-readerType 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 himself65/finance-skills --skill yc-reader -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install himself65/finance-skills yc-reader --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/himself65/finance-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/social-readers/skills/yc-reader .agents/skills/yc-reader && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "yc-reader" agent skill from https://github.com/himself65/finance-skills/tree/main/plugins/social-readers/skills/yc-reader into .agents/skills/yc-reader/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "yc-reader", 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 himself65/finance-skills --skill yc-reader -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install himself65/finance-skills yc-reader --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/himself65/finance-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/social-readers/skills/yc-reader .cursor/skills/yc-reader && 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 "yc-reader" agent skill from https://github.com/himself65/finance-skills/tree/main/plugins/social-readers/skills/yc-reader into .cursor/skills/yc-reader/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "yc-reader", 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/himself65/finance-skills.git --path plugins/social-readers/skills/yc-reader--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 himself65/finance-skills --skill yc-reader -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install himself65/finance-skills yc-reader --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/himself65/finance-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/social-readers/skills/yc-reader .gemini/skills/yc-reader && 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 "yc-reader" agent skill from https://github.com/himself65/finance-skills/tree/main/plugins/social-readers/skills/yc-reader into .gemini/skills/yc-reader/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "yc-reader", 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 himself65/finance-skills yc-readerInstalls 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 himself65/finance-skills --skill yc-reader -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/himself65/finance-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/social-readers/skills/yc-reader .github/skills/yc-reader && 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 "yc-reader" agent skill from https://github.com/himself65/finance-skills/tree/main/plugins/social-readers/skills/yc-reader into .github/skills/yc-reader/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "yc-reader", 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 himself65/finance-skills --skill yc-reader -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install himself65/finance-skills yc-reader --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/himself65/finance-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/social-readers/skills/yc-reader .opencode/skills/yc-reader && 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 "yc-reader" agent skill from https://github.com/himself65/finance-skills/tree/main/plugins/social-readers/skills/yc-reader into .opencode/skills/yc-reader/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "yc-reader", 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
yc-reader- GitHub stars
- 3.4k
- Token cost
- ~1.7k tokens
- SKILL.md length
- 613 words
- Files
- 3 (incl. references)
- Skills in repo
- 22
- Repo updated
- First seen
- Licence
- MIT
At a glance
Look up Y Combinator companies and batches from the public yc-oss API, a static JSON dataset refreshed daily: company profiles, batch rosters (e.g.
- Works in 5 steps: Verify Prerequisites → Identify What the User Needs → Execute the Request → …
- The user asks about YC-backed startups
- SKILL.md covers Step 1: Verify Prerequisites, Step 2: Identify What the User…, Step 3: Execute the Request and Step 4: Present the Results, plus 2 more sections
- Calls jq, curl and brew; reaches yc-oss.github.io
What it does
Yc Reader is an agent skill from himself65/finance-skills. Look up Y Combinator companies and batches from the public yc-oss API, a static JSON dataset refreshed daily: company profiles, batch rosters (e.g. W25, S24), companies by industry or tag, top companies, who is hiring, founder-diversity lists, and overall YC stats. Use this skill whenever the user asks about YC-backed startups, a YC batch, YC companies in a sector or tag or that are hiring, the Y Combinator portfolio, or startup and venture research that draws on YC data. Read-only.
Its SKILL.md is about 1.7k tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including reference files (for example `README.md` and `references/api_reference.md`).
It sits in Business, Finance & HR. The repository describes itself as: A collection of skills for AI financial analysis. The licence is MIT.
When your agent uses it
- The user asks about YC-backed startups
- YC companies in a sector
- That are hiring
- The Y Combinator portfolio
Example prompts
- “/yc-reader”
Requirements
- Python 3
Workflow steps
5 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 01fc7b4. 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:
jqcurlbrewapt-get
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
yc-oss.github.io
Also links to:
github.com
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
Yc Reader loads about 1.7k tokens when it runs, and up to ~4.3k if it reads all its reference files. Until then it costs about 124 tokens; SKILL.md has 613 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: notes
The automated check noted patterns worth knowing about, such as sudo or a known installer.
- NoteRuns commands with sudoSKILL.md:37
sudo apt-get install jq
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
The full file from himself65/finance-skills at commit 01fc7b4, republished under its MIT licence (© himself65). 613 words, ~1,711 tokens.
Download SKILL.mdSave it as
.claude/skills/yc-reader/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.- name
- yc-reader
- description
- Look up Y Combinator companies and batches from the public yc-oss API, a static JSON dataset refreshed daily: company profiles, batch rosters (e.g. W25, S24), companies by industry or tag, top companies, who is hiring, founder-diversity lists, and overall YC stats. Use this skill whenever the user asks about YC-backed startups, a YC batch, YC companies in a sector or tag or that are hiring, the Y Combinator portfolio, or startup and venture research that draws on YC data. Read-only.
Y Combinator Reader (Read-Only)
Fetches Y Combinator company data from the yc-oss/api, an unofficial open-source API that indexes all publicly launched YC companies. The data is sourced from YC's Algolia search index and updated daily via GitHub Actions.
This is a read-only data source. It provides company profiles, batch listings, industry/tag breakdowns, hiring status, and diversity data. No write operations exist — the API serves static JSON files.
No authentication required. The API is public and free. Just use curl to fetch JSON endpoints.
Step 1: Verify Prerequisites
This skill only needs curl (to fetch data) and jq (to parse/filter JSON). Both are pre-installed on most systems.
!`(command -v curl > /dev/null && echo "CURL_OK" || echo "CURL_MISSING") && (command -v jq > /dev/null && echo "JQ_OK" || echo "JQ_MISSING")`If JQ_MISSING, install it:
# macOS
brew install jq
# Linux (Debian/Ubuntu)
sudo apt-get install jqIf jq is unavailable, you can still fetch raw JSON with curl and parse it inline with Python or other tools — but jq makes filtering much easier.
Step 2: Identify What the User Needs
Match the user's request to the appropriate endpoint. See references/api_reference.md for full details.
| User Request | Endpoint | Notes |
|---|---|---|
| Overall YC stats | meta.json | Company count, batch list, industry/tag lists |
| All companies | companies/all.json | Full dataset (~5,700 companies) — large response |
| Top companies | companies/top.json | ~91 top-performing YC companies |
| Companies hiring | companies/hiring.json | ~1,400 currently hiring |
| Non-profit companies | companies/nonprofit.json | YC-backed non-profits |
| Diversity data | companies/black-founded.json, hispanic-latino-founded.json, women-founded.json | Founder diversity |
| Specific batch | batches/{batch-name}.json | e.g., winter-2026.json, spring-2026.json, fall-2025.json |
| Single company profile | batches/{batch-name}/{slug}.json | e.g., batches/summer-2009/stripe.json, batches/winter-2009/airbnb.json |
| By industry | industries/{industry}.json | e.g., fintech.json, healthcare.json |
| By tag | tags/{tag}.json | e.g., ai.json, developer-tools.json |
Batch name format
Batches use {season}-{year} format: winter-2026, spring-2026, summer-2026, fall-2025. Older batches follow the same pattern back to summer-2005. The short form (w09, s21) also works for the per-company endpoint.
Industry and tag name format
Use lowercase with hyphens for multi-word names: real-estate, developer-tools, machine-learning.
Step 3: Execute the Request
Base URL
https://yc-oss.github.io/api/General pattern
# Fetch and pretty-print
curl -s https://yc-oss.github.io/api/companies/top.json | jq .
# Count companies in a result
curl -s https://yc-oss.github.io/api/batches/winter-2025.json | jq length
# Filter by field (e.g., hiring companies in a batch)
curl -s https://yc-oss.github.io/api/batches/winter-2025.json | jq '[.[] | select(.isHiring == true)]'
# Extract specific fields
curl -s https://yc-oss.github.io/api/companies/top.json | jq '.[] | {name, one_liner, batch, team_size, website}'
# Search by name (case-insensitive)
curl -s https://yc-oss.github.io/api/companies/all.json | jq '[.[] | select(.name | test("stripe"; "i"))]'Key rules
- Use
-sflag with curl to suppress progress output - Pipe through
jqfor readable output and filtering - Avoid fetching
companies/all.jsonunless necessary — it's a large response (~5,700 companies). Prefer more specific endpoints (batches, industries, tags) when possible - Use
jqselect/filter to narrow results client-side when the API doesn't have a specific endpoint for what the user wants - Batch names are lowercase with hyphens —
winter-2025notWinter 2025orW25 - Tag and industry names are lowercase with hyphens —
developer-toolsnotDeveloper Tools
Show full SKILL.md (238 more words)Show less
Common jq filters
| Filter | Purpose |
|---|---|
jq length | Count results |
jq '.[0]' | First company |
jq '.[:10]' | First 10 companies |
jq '[.[] | select(.isHiring == true)]' | Only hiring companies |
jq '[.[] | select(.status == "Active")]' | Only active companies |
jq '[.[] | select(.team_size > 100)]' | Companies with 100+ employees |
jq '.[] | {name, one_liner, batch, website}' | Select specific fields |
jq '[.[] | select(.name | test("query"; "i"))]' | Search by name |
jq 'sort_by(-.team_size) | .[:10]' | Top 10 by team size |
Step 4: Present the Results
Summarize rather than dump JSON. For each company, give the name, one-liner, batch, team size, status, hiring status (a growth signal), and website. For a batch, lead with its size and notable companies; for an industry or tag, the count and which companies are top or hiring; for research questions, aggregate stats such as counts, common industries, and team-size distribution. Mention that the dataset refreshes daily.
Step 5: Diagnostics
If a request fails:
| Error | Cause | Fix |
|---|---|---|
404 Not Found | Invalid batch, industry, or tag name | Check meta.json for valid names |
Empty array [] | No companies match the query | Broaden the search or check spelling |
curl: Could not resolve host | No internet connection | Check network connectivity |
| Large/slow response | Fetching companies/all.json (5,700+ entries) | Use a more specific endpoint or add jq filters |
To discover valid batch, industry, and tag names:
# List all batches
curl -s https://yc-oss.github.io/api/meta.json | jq '.batches[].name'
# List all industries
curl -s https://yc-oss.github.io/api/meta.json | jq '.industries[].name'
# List all tags (there are 333+)
curl -s https://yc-oss.github.io/api/meta.json | jq '.tags[].name'Reference Files
references/api_reference.md— Complete endpoint reference with company schema, all endpoint URLs, and research workflow examples
Read the reference file when you need the exact company field schema, valid batch/industry/tag names, or detailed research workflow patterns.
© himself65, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 2 other files (references) in plugins/social-readers/skills/yc-reader of himself65/finance-skills.
- SKILL.md
- README.md
- references/api_reference.md
Open the folder on GitHubat commit 01fc7b4
Compare with similar skills
Yc Reader 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 |
|---|---|---|---|---|---|---|
| Yc Reader this skillhimself65/finance-skills | 3.4k | — | ~1.7k | Automated safety check: Notes | MIT | |
| Technical Analysttradermonty/claude-trading-skills | 3k | 5 repos | ~4.6k | Automated safety check: Pass | MIT | |
| Creating Financial ModelsChen-zexi/open-ptc-agent | 730 | 4 repos | ~1.3k | Automated safety check: Pass | MIT | |
| Theme Detectortradermonty/claude-trading-skills | 3k | 2 repos | ~4.9k | Automated safety check: Pass | MIT | |
| Stock APIzhangxiangliang/stock-api | 2k | — | ~507 | Automated safety check: Pass | MIT | |
| Itr Walakaranb192/itr-wala | 871 | — | ~3.6k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Yc Reader
What does Yc Reader do?
Look up Y Combinator companies and batches from the public yc-oss API, a static JSON dataset refreshed daily: company profiles, batch rosters (e.g. Yc Reader is an agent skill from himself65/finance-skills.g.
When should I use Yc Reader?
Yc Reader fits situations like: the user asks about YC-backed startups; YC companies in a sector; that are hiring; the Y Combinator portfolio.
How do I install Yc Reader in Claude Code?
Run `npx skills add himself65/finance-skills --skill yc-reader -a claude-code`. Or copy the skill folder (plugins/social-readers/skills/yc-reader in himself65/finance-skills) into .claude/skills/yc-reader in your project. Claude Code loads it when a task matches its description.
How do I install Yc Reader in Codex?
Run `npx skills add himself65/finance-skills --skill yc-reader -a codex`. Or copy the skill folder (plugins/social-readers/skills/yc-reader in himself65/finance-skills) into .agents/skills/yc-reader in your project. Codex loads it when a task matches its description.
Can I use Yc Reader 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 himself65/finance-skills --skill yc-reader -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/yc-reader, .gemini/skills/yc-reader, .github/skills/yc-reader and .opencode/skills/yc-reader in your project.
What does Yc Reader need to run?
Going by SKILL.md and its folder, Yc Reader needs the command-line tools its instructions call (jq, curl, brew and apt-get). Our summary lists: Python 3.
Does Yc Reader access the network?
SKILL.md names 2 domains. In commands or code: yc-oss.github.io; the agent is likely to contact it when it follows the instructions. As links in the text: github.com. This is read from the text; nothing was executed.
Is Yc Reader safe to install?
Our automated static check of SKILL.md found notes only (runs commands with sudo), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.
What licence does Yc Reader use?
Yc Reader is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Yc Reader use?
About 1.7k tokens (SKILL.md is roughly 6.8k 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 2.5k tokens, read only when the agent opens those files.
What are the alternatives to Yc Reader?
Skills that share tags, products or a category with Yc Reader: Technical Analyst (tradermonty/claude-trading-skills, 3k stars), Creating Financial Models (Chen-zexi/open-ptc-agent, 730 stars), Theme Detector (tradermonty/claude-trading-skills, 3k stars) and Stock API (zhangxiangliang/stock-api, 2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Yc Reader?
himself65 (a GitHub user) maintains it in himself65/finance-skills, which has 3,382 GitHub stars. The repository holds 22 skills in this directory. The repository was last updated on October 5, 2026.
Source: himself65/finance-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.