LangAlpha is an agent workspace for researching financial markets and supporting investment decisions through persistent research, news analysis, and parallel subagents. It is for investors who want to develop and update trading theses over time, including generating long-short pair-trade ideas. The catalogue entries provide the skills, instructions, MCP servers, and plugin that make up its agent workflow.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add ginlix-ai/LangAlpha --skill xlsxgit clone --depth 1 https://github.com/ginlix-ai/LangAlphaWrote 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/ginlix-ai/langalpha/xlsx)<a href="https://agentmods.dev/skills/ginlix-ai/langalpha/xlsx"><img src="https://agentmods.dev/badge/skills/ginlix-ai/langalpha/xlsx/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/ginlix-ai/langalpha/xlsx"><img src="https://agentmods.dev/badge/skills/ginlix-ai/langalpha/xlsx.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 | $0.00039 | $0.09337 |
| Opus 5.5 | $0.00016 | $0.03735 |
| Sonnet 5.5 | $0.00008 | $0.01867 |
| Haiku 4.5 | $0.00004 | $0.00934 |
Grade A, and why
xlsx 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.
This is a copy
91% identical to xlsx — 436 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 280 lines — stays where its author put it; the contents beside it link to each section on GitHub.
XLSX
Build or edit an Excel workbook and write it into the task directory (e.g. dcf_acme/acme_dcf.xlsx). The user opens it in Excel, changes an input, and every dependent number moves. That is the whole point of the format: a workbook the agent delivers is a model, not a table of results. A cell that could be computed from other cells is a formula. A number typed into a formula's place is a defect, even when the value is right today.
This is the right output when the user wants something they will keep working in: a DCF, a comps sheet, a three-statement model, a screen they will re-sort, a schedule they will extend. It is the wrong output for a one-off table (put it in the chat or an HTML report) and for a document that will not be edited (see .agents/skills/html-report/SKILL.md).
User preferences override these defaults. A house colour code, a template workbook, a sheet layout the user has described: those outrank every rule here. Inside a workbook the font colour code below outranks the general house palette in
ui-design(green means a cross-sheet link here, not a gain). The rules below are for when nothing has been specified.
Decide: Which Output?
| Want | Use |
|---|---|
| A model the user will edit, extend, or plug into their own workbook | xlsx (this skill) |
| A polished document to read, print, or share, possibly with charts | html-report |
| A dataset for another program | .csv via pandas, no styling |
| One table in the conversation | markdown table |
Workflow
- Plan the sheets before writing code: which sheet holds inputs, which holds calculations, which holds outputs. Sketch the row labels and the period columns. A model that is laid out first is a model whose formulas can be copied across.
- Write a build script,
<task>/build_<name>.py, and run it. Never build a workbook cell by cell in ad-hoc calls. The script is the source of truth; when the user asks for a change, edit the script and rerun. - Recalculate:
python .agents/skills/xlsx/scripts/recalc.py <task>/<name>.xlsx 60. Fix every listed error and rerun until"status": "success". - Audit:
python .agents/skills/xlsx/scripts/audit.py <task>/<name>.xlsx --strict. Fix everyfail; for everywarn, either fix it or write the one line in the delivery that says why it stands.--strictis the prescribed form: it exits non-zero on afailand promotesformula_number_formatfrom a warning. - Render and look:
python .agents/skills/xlsx/scripts/render.py <task>/<name>.xlsx, then view the PNGs. Overflowing###columns, unformatted rates, and headers that do not line up are visible here and nowhere else. - Spot-check three numbers by hand against your own calculation before delivering. A clean recalc proves the formulas evaluate, not that they are the right formulas.
- Assert the sensitivity centre in the build script. Where the model has a sensitivity grid, the script reopens the workbook after
recalc.pywithdata_only=True, reads the centre cell of every grid and the headline output it varies, and asserts they are equal. A grid that has come unwired then fails the build instead of shipping. Name the same pair in aChecksrow (below): that row is what letsaudit.pyre-check the equality on a workbook nobody rebuilt, and without it the audit reportssensitivity_unverifiedrather than deciding for itself which output the grid varies.
What ships with it
5 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.
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 Changed a1993041cc23
- 1mo ago Changed · -15 lines · -162 tokens per session 04cb4cbe24d3
- 1mo ago First seen · 295 lines · 201 tokens per session scan A 00b023c6f615
xlsx is a skill published in the GitHub repository ginlix-ai/LangAlpha (2,155 stars, last pushed today), licensed Apache-2.0. It adds 39 tokens to every session and 9,337 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 91% identical to xlsx, differing in 436 lines, and is treated as a copy.
Other skills, from other repositories
xlsx
Comprehensive spreadsheet creation, editing, and analysis with support for formulas, formatting, data analysis, and visualization. When Claude needs to work with spreadsheets (.xlsx, .xlsm, .csv, .tsv, etc) for: (1) Creating new spreadsheets with formulas and formatting, (2) Reading or analyzing data, (3) Modify…
Comprehensive PDF manipulation toolkit for extracting text and tables, creating new PDFs, merging/splitting documents, and handling forms. When Claude needs to fill in a PDF form or programmatically process, generate, or analyze PDF documents at scale.
pptx
Presentation creation, editing, and analysis. When Claude needs to work with presentations (.pptx files) for: (1) Creating new presentations, (2) Modifying or editing content, (3) Working with layouts, (4) Adding comments or speaker notes, or any other presentation tasks.
docx
Comprehensive document creation, editing, and analysis with support for tracked changes, comments, formatting preservation, and text extraction. When Claude needs to work with professional documents (.docx files) for: (1) Creating new documents, (2) Modifying or editing content, (3) Working with tracked changes, (4)…
xlsx
Read, edit, or create Microsoft Excel .xlsx workbooks. Trigger this skill whenever the user mentions a spreadsheet, .xlsx file, workbook, sheet, formula, pivot table, or asks to extract tabular data, modify a sheet, or build a workbook from rows. Three execution paths: structured inspection, in-place cell edits, and…
meta-knowledge-base-bootstrap
Bootstrap a domain knowledge base from a single seed (URL / PDF path / git repo / free-text topic): classify source → ingest with the right tool → persist to memory + xlsx index.