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Guide to writing custom middlewares for the Horse framework, following the callback flow with the Next parameter.
MITAuto-check passed
Install Horse Writing Middleware
$ npx skills add HashLoad/horse --skill horse-writing-middleware -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install HashLoad/horse horse-writing-middleware --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/HashLoad/horse.git skills-src && mkdir -p .claude/skills && cp -r skills-src/doc/skills/horse-writing-middleware .claude/skills/horse-writing-middleware && 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 "horse-writing-middleware" agent skill from https://github.com/HashLoad/horse/tree/master/doc/skills/horse-writing-middleware into .claude/skills/horse-writing-middleware/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "horse-writing-middleware", 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/HashLoad/horse/tree/master/doc/skills/horse-writing-middlewareType 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 HashLoad/horse --skill horse-writing-middleware -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install HashLoad/horse horse-writing-middleware --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HashLoad/horse.git skills-src && mkdir -p .agents/skills && cp -r skills-src/doc/skills/horse-writing-middleware .agents/skills/horse-writing-middleware && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "horse-writing-middleware" agent skill from https://github.com/HashLoad/horse/tree/master/doc/skills/horse-writing-middleware into .agents/skills/horse-writing-middleware/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "horse-writing-middleware", 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 HashLoad/horse --skill horse-writing-middleware -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install HashLoad/horse horse-writing-middleware --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HashLoad/horse.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/doc/skills/horse-writing-middleware .cursor/skills/horse-writing-middleware && 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 "horse-writing-middleware" agent skill from https://github.com/HashLoad/horse/tree/master/doc/skills/horse-writing-middleware into .cursor/skills/horse-writing-middleware/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "horse-writing-middleware", 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/HashLoad/horse.git --path doc/skills/horse-writing-middleware--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 HashLoad/horse --skill horse-writing-middleware -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install HashLoad/horse horse-writing-middleware --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HashLoad/horse.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/doc/skills/horse-writing-middleware .gemini/skills/horse-writing-middleware && 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 "horse-writing-middleware" agent skill from https://github.com/HashLoad/horse/tree/master/doc/skills/horse-writing-middleware into .gemini/skills/horse-writing-middleware/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "horse-writing-middleware", 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 HashLoad/horse horse-writing-middlewareInstalls 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 HashLoad/horse --skill horse-writing-middleware -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/HashLoad/horse.git skills-src && mkdir -p .github/skills && cp -r skills-src/doc/skills/horse-writing-middleware .github/skills/horse-writing-middleware && 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 "horse-writing-middleware" agent skill from https://github.com/HashLoad/horse/tree/master/doc/skills/horse-writing-middleware into .github/skills/horse-writing-middleware/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "horse-writing-middleware", 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 HashLoad/horse --skill horse-writing-middleware -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install HashLoad/horse horse-writing-middleware --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HashLoad/horse.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/doc/skills/horse-writing-middleware .opencode/skills/horse-writing-middleware && 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 "horse-writing-middleware" agent skill from https://github.com/HashLoad/horse/tree/master/doc/skills/horse-writing-middleware into .opencode/skills/horse-writing-middleware/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "horse-writing-middleware", 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
horse-writing-middleware- GitHub stars
- 1.4k
- Token cost
- ~355 tokens
- SKILL.md length
- 49 words
- Files
- 1
- Skills in repo
- 23
- Repo updated
- First seen
- Licence
- MIT
At a glance
Guide to writing custom middlewares for the Horse framework, following the callback flow with the Next parameter.
- SKILL.md covers Middleware Signature and Terminating Execution Early
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Horse Writing Middleware is an agent skill from HashLoad/horse. Guide to writing custom middlewares for the Horse framework, following the callback flow with the Next parameter.
Its SKILL.md is about 360 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
The repository describes itself as: Fast, opinionated, minimalist web framework for Delphi. The licence is MIT.
Example prompts
- “/horse-writing-middleware”
What it can do on your machine
Read from SKILL.md and the folder at commit d4351a5. 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
No scripts in the folder and no shell commands in SKILL.md (its code samples are pascal).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
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
Horse Writing Middleware loads about 355 tokens when it runs. Until then it costs about 35 tokens; SKILL.md has 49 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
The full file from HashLoad/horse at commit d4351a5, republished under its MIT licence (© HashLoad). 49 words, ~355 tokens.
Download SKILL.mdSave it as
.claude/skills/horse-writing-middleware/SKILL.md (or your agent's skills folder).- name
- horse-writing-middleware
- description
- Guide to writing custom middlewares for the Horse framework, following the callback flow with the Next parameter.
Writing Custom Horse Middlewares
Middleware Signature
A custom middleware is a procedure that receives THorseRequest, THorseResponse, and a callback procedure Next.
procedure MyCustomMiddleware(Req: THorseRequest; Res: THorseResponse; Next: TProc);
begin
// 1. Logic BEFORE the request reaches the endpoint handler
Req.Headers.AddOrSetValue('X-Processed-By', 'MyMiddleware');
// 2. Call Next to delegate execution to the subsequent middleware or route handler
Next;
// 3. Logic AFTER the route handler completes its execution
Res.Headers.AddOrSetValue('X-Execution-Finished', 'True');
end;Terminating Execution Early
If a validation fails (e.g., authentication is missing), do NOT call Next. Set the status and send the response immediately. This halts the pipeline execution.
procedure AuthMiddleware(Req: THorseRequest; Res: THorseResponse; Next: TProc);
var
LToken: string;
begin
LToken := Req.Headers.Items['Authorization'];
if LToken.IsEmpty then
begin
// Halt execution by sending response and omitting the Next call
Res.Send('Unauthorized').Status(THTTPStatus.Unauthorized);
Exit;
end;
// Token is valid, proceed with pipeline
Next;
end;© HashLoad, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in doc/skills/horse-writing-middleware of HashLoad/horse.
Open the folder on GitHubat commit d4351a5
Compare with similar skills
Horse Writing Middleware 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 |
|---|---|---|---|---|---|---|
| Horse Writing Middleware this skillHashLoad/horse | 1.4k | — | ~355 | Automated safety check: Pass | MIT | |
| Follow Up Resultspaperclipai/paperclip | 99k | — | ~732 | Automated safety check: Pass | MIT | |
| Signals Scout PR Follow UpPostHog/posthog | 40k | — | ~8.7k | Automated safety check: Pass | Custom licence | |
| Follow Up From Granolasuperset-sh/superset | 15k | — | ~758 | Automated safety check: Pass | Custom licence | |
| Tsed Middlewarestsedio/tsed | 3.1k | — | ~2.4k | Automated safety check: Pass | MIT | |
| You Might Not Need A Callbacksimstudioai/sim | 30k | — | ~904 | Automated safety check: Pass | Apache-2.0 |
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Questions about Horse Writing Middleware
What does Horse Writing Middleware do?
Guide to writing custom middlewares for the Horse framework, following the callback flow with the Next parameter. Horse Writing Middleware is an agent skill from HashLoad/horse. Guide to writing custom middlewares for the Horse framework, following the callback flow with the Next parameter.
How do I install Horse Writing Middleware in Claude Code?
Run `npx skills add HashLoad/horse --skill horse-writing-middleware -a claude-code`. Or copy the skill folder (doc/skills/horse-writing-middleware in HashLoad/horse) into .claude/skills/horse-writing-middleware in your project. Claude Code loads it when a task matches its description.
How do I install Horse Writing Middleware in Codex?
Run `npx skills add HashLoad/horse --skill horse-writing-middleware -a codex`. Or copy the skill folder (doc/skills/horse-writing-middleware in HashLoad/horse) into .agents/skills/horse-writing-middleware in your project. Codex loads it when a task matches its description.
Can I use Horse Writing Middleware 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 HashLoad/horse --skill horse-writing-middleware -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/horse-writing-middleware, .gemini/skills/horse-writing-middleware, .github/skills/horse-writing-middleware and .opencode/skills/horse-writing-middleware in your project.
What does Horse Writing Middleware need to run?
SKILL.md names no scripts, command-line tools or credentials: Horse Writing Middleware is instructions for the agent only.
Does Horse Writing Middleware 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 Horse Writing Middleware 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 Horse Writing Middleware use?
Horse Writing Middleware 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 Horse Writing Middleware use?
About 355 tokens (SKILL.md is roughly 1.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Horse Writing Middleware?
Skills that share tags, products or a category with Horse Writing Middleware: Follow Up Results (paperclipai/paperclip, 99k stars), Signals Scout PR Follow Up (PostHog/posthog, 40k stars), Follow Up From Granola (superset-sh/superset, 15k stars) and Tsed Middlewares (tsedio/tsed, 3.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Horse Writing Middleware?
HashLoad (a GitHub organization) maintains it in HashLoad/horse, which has 1,378 GitHub stars. The repository holds 23 skills in this directory. The repository was last updated on October 7, 2026.
Source: HashLoad/horse on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.