Writing Livekit Scenarios
livekit-examples/agent-starter-python
Creates and maintains the scenarios a LiveKit agent simulation runs, and wires the agent to consume them.
Stress-test an idea, plan, architecture frame, definition, criterion, draft, or done claim using Pact's packaged Jeremy Simulacrum.
Install Simulacrum
$ npx skills add wandercom/pact --skill simulacrum -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install wandercom/pact simulacrum --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/wandercom/pact.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/simulacrum .claude/skills/simulacrum && 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 "simulacrum" agent skill from https://github.com/wandercom/pact/tree/main/skills/simulacrum into .claude/skills/simulacrum/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "simulacrum", 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/wandercom/pact/tree/main/skills/simulacrumType 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 wandercom/pact --skill simulacrum -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install wandercom/pact simulacrum --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/wandercom/pact.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/simulacrum .agents/skills/simulacrum && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "simulacrum" agent skill from https://github.com/wandercom/pact/tree/main/skills/simulacrum into .agents/skills/simulacrum/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "simulacrum", 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 wandercom/pact --skill simulacrum -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install wandercom/pact simulacrum --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/wandercom/pact.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/simulacrum .cursor/skills/simulacrum && 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 "simulacrum" agent skill from https://github.com/wandercom/pact/tree/main/skills/simulacrum into .cursor/skills/simulacrum/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "simulacrum", 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/wandercom/pact.git --path skills/simulacrum--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 wandercom/pact --skill simulacrum -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install wandercom/pact simulacrum --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/wandercom/pact.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/simulacrum .gemini/skills/simulacrum && 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 "simulacrum" agent skill from https://github.com/wandercom/pact/tree/main/skills/simulacrum into .gemini/skills/simulacrum/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "simulacrum", 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 wandercom/pact simulacrumInstalls 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 wandercom/pact --skill simulacrum -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/wandercom/pact.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/simulacrum .github/skills/simulacrum && 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 "simulacrum" agent skill from https://github.com/wandercom/pact/tree/main/skills/simulacrum into .github/skills/simulacrum/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "simulacrum", 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 wandercom/pact --skill simulacrum -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install wandercom/pact simulacrum --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/wandercom/pact.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/simulacrum .opencode/skills/simulacrum && 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 "simulacrum" agent skill from https://github.com/wandercom/pact/tree/main/skills/simulacrum into .opencode/skills/simulacrum/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "simulacrum", 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
simulacrum- GitHub stars
- 165
- Token cost
- ~313 tokens
- SKILL.md length
- 102 words
- Files
- 2
- Skills in repo
- 2
- Repo updated
- First seen
- Licence
- MIT
At a glance
Stress-test an idea, plan, architecture frame, definition, criterion, draft, or done claim using Pact's packaged Jeremy Simulacrum.
- Jeremy-style pushback
- Needs ANTHROPIC_API_KEY and PACT_REVIEW_ANTHROPIC_API_KEY
- The strongest counterargument
What it does
Simulacrum is an agent skill from wandercom/pact. Stress-test an idea, plan, architecture frame, definition, criterion, draft, or done claim using Pact's packaged Jeremy Simulacrum. Use proactively before committing to categorical claims or when the user asks for Sim, Simulacrum, Jeremy-style pushback, or the strongest counterargument.
Its SKILL.md is about 310 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).
It sits in Testing & QA, covering Load testing. The repository describes itself as: Contracts before code. Tests as law. Agents that can't cheat. The licence is MIT.
When your agent uses it
- Jeremy-style pushback
- The strongest counterargument
Example prompts
- “/simulacrum”
Requirements
- A credential in ANTHROPIC_API_KEY
- A credential in PACT_REVIEW_ANTHROPIC_API_KEY
What it can do on your machine
Read from SKILL.md and the folder at commit f27b38e. 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 bash).
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 these keys or tokens, usually read from environment variables:
ANTHROPIC_API_KEYPACT_REVIEW_ANTHROPIC_API_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Simulacrum loads about 313 tokens when it runs. Until then it costs about 75 tokens; SKILL.md has 102 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 wandercom/pact at commit f27b38e, republished under its MIT licence (© wandercom). 102 words, ~313 tokens.
Download SKILL.mdSave it as
.claude/skills/simulacrum/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- simulacrum
- description
- Stress-test an idea, plan, architecture frame, definition, criterion, draft, or done claim using Pact's packaged Jeremy Simulacrum. Use proactively before committing to categorical claims or when the user asks for Sim, Simulacrum, Jeremy-style pushback, or the strongest counterargument.
Simulacrum
Use Pact's packaged Simulacrum rather than searching for a user-specific skill or executable.
For a direct claim review:
pact review "$TARGET_REPO" --sim-only --claim "$CLAIM"For multi-tool post-implementation review:
pact review "$TARGET_REPO" --claim "$DONE_CLAIM"Read the persisted simulacrum.md. A successful process means Sim completed;
it does not mean Sim approved the claim. Adjudicate the critique, correct the
frame or work when warranted, and rerun the review.
Pact ships the Sim runtime and annotated corpus. Provider calls use the local
operator's ANTHROPIC_API_KEY or PACT_REVIEW_ANTHROPIC_API_KEY directly;
Pact does not proxy or subsidize them. The optional PACT_SIMULACRUM_CMD
variable is an explicit operator override only. Operators can override the
packaged Anthropic model IDs with SIMULACRUM_CLASSIFIER_MODEL and
SIMULACRUM_SPECIALIST_MODEL.
© wandercom, 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 1 other file in skills/simulacrum of wandercom/pact.
- SKILL.md
- agents/openai.yaml
Open the folder on GitHubat commit f27b38e
Compare with similar skills
Simulacrum 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 |
|---|---|---|---|---|---|---|
| Simulacrum this skillwandercom/pact | 165 | — | ~313 | Automated safety check: Pass | MIT | |
| Writing Livekit Scenarioslivekit-examples/agent-starter-python | 264 | 1 repos | ~2.5k | Automated safety check: Pass | MIT | |
| Go Testingcxuu/golang-skills | 170 | 1 repos | ~1.3k | Automated safety check: Pass | Apache-2.0 | |
| Goalcraftgrp06/goalcraft | 102 | — | ~3.8k | Automated safety check: Pass | MIT | |
| Thinking Partnermattnowdev/thinking-partner | 205 | — | ~4.4k | Automated safety check: Pass | MIT | |
| Challengeblueberrycongee/termcanvas | 406 | — | ~1.5k | Automated safety check: Pass | MIT |
Similar skills
Go Testing
cxuu/golang-skills
A skill your agent uses when writing, reviewing, or improving Go test code — including table-driven tests, subtests, parallel tests, test helpers, test doubles, and assertions with cmp.Diff.
Goalcraft
grp06/goalcraft
Turn a rough draft, vague ambition, or messy task brief into a powerful Codex /goal objective for persistent, evidence-checked work.
Thinking Partner
mattnowdev/thinking-partner
A deterministic thinking partner that challenges assumptions and applies mental models to sharpen decisions, solve problems, and think more clearly.
Challenge
blueberrycongee/termcanvas
Adversarial review skill. An agent skill from blueberrycongee/termcanvas.
Vision
kunchenguid/vision
Draft and stress-test a VISION.md for a repository, then iterate with the author on an interactive review board until approved.
More from wandercom/pact
Pact Engineer
wandercom/pact
Use Pact as a plan-first contract and test engine while the active Claude or Codex agent implements, reconciles infeasible contracts, validates the result, and runs Advocate plus Simulacrum review.
Related
Categories
Questions about Simulacrum
What does Simulacrum do?
Stress-test an idea, plan, architecture frame, definition, criterion, draft, or done claim using Pact's packaged Jeremy Simulacrum. Simulacrum is an agent skill from wandercom/pact. Stress-test an idea, plan, architecture frame, definition, criterion, draft, or done claim using Pact's packaged Jeremy Simulacrum.
When should I use Simulacrum?
Simulacrum fits situations like: jeremy-style pushback; the strongest counterargument.
How do I install Simulacrum in Claude Code?
Run `npx skills add wandercom/pact --skill simulacrum -a claude-code`. Or copy the skill folder (skills/simulacrum in wandercom/pact) into .claude/skills/simulacrum in your project. Claude Code loads it when a task matches its description.
How do I install Simulacrum in Codex?
Run `npx skills add wandercom/pact --skill simulacrum -a codex`. Or copy the skill folder (skills/simulacrum in wandercom/pact) into .agents/skills/simulacrum in your project. Codex loads it when a task matches its description.
Can I use Simulacrum 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 wandercom/pact --skill simulacrum -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/simulacrum, .gemini/skills/simulacrum, .github/skills/simulacrum and .opencode/skills/simulacrum in your project.
What does Simulacrum need to run?
Going by SKILL.md and its folder, Simulacrum needs credentials named ANTHROPIC_API_KEY and PACT_REVIEW_ANTHROPIC_API_KEY. Our summary lists: A credential in ANTHROPIC_API_KEY; A credential in PACT_REVIEW_ANTHROPIC_API_KEY.
Does Simulacrum 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 Simulacrum 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 Simulacrum use?
Simulacrum 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 Simulacrum use?
About 313 tokens (SKILL.md is roughly 1.3k 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 Simulacrum?
Skills that share tags, products or a category with Simulacrum: Writing Livekit Scenarios (livekit-examples/agent-starter-python, 264 stars), Go Testing (cxuu/golang-skills, 170 stars), Goalcraft (grp06/goalcraft, 102 stars) and Thinking Partner (mattnowdev/thinking-partner, 205 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Simulacrum?
wandercom (a GitHub organization) maintains it in wandercom/pact, which has 165 GitHub stars. The repository holds 2 skills in this directory. The repository was last updated on October 4, 2026.
Source: wandercom/pact on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.