emulate provides local, stateful replacements for APIs and services so software can run in CI or environments without network access. It is used by developers who need production-like integrations with services such as GitHub, Stripe, AWS, Slack, and databases during testing. Its catalogue skills and instruction support agent workflows that use these local emulators.
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 vercel-labs/emulate --skill lineargit clone --depth 1 https://github.com/vercel-labs/emulateWrote 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/vercel-labs/emulate/linear)<a href="https://agentmods.dev/skills/vercel-labs/emulate/linear"><img src="https://agentmods.dev/badge/skills/vercel-labs/emulate/linear/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/vercel-labs/emulate/linear"><img src="https://agentmods.dev/badge/skills/vercel-labs/emulate/linear.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 6 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium MCP Rug Pull · line 4 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 15 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium Data Exfiltration · line 24 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Data Exfiltration · line 26 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Data Exfiltration · line 27 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Data Exfiltration · line 34 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
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 | $0.00100 | $0.01370 |
| Opus 5.5 | $0.00040 | $0.00548 |
| Sonnet 5.5 | $0.00020 | $0.00274 |
| Haiku 4.5 | $0.00010 | $0.00137 |
Grade A, and why
linear scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 21d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl "$LINEAR_EMULATOR_URL/graphql" \ Copies of this mod
1 near-identical copy found in the catalogue:
- linear — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 134 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Linear API Emulator
Stateful Linear GraphQL API emulation with organizations, users, teams, workflow states, issues, comments, labels, projects, cycles, OAuth apps, tokens, webhooks, and basic agent sessions.
Start
Local listeners bind to 127.0.0.1 by default. For access from containers or other machines, pass --host 0.0.0.0 to the CLI or hostname: '0.0.0.0' to createEmulator. Configure --base-url or baseUrl for advertised URLs reachable by those clients.
# Linear only
npx emulate --service linear
Default URL: http://localhost:4012 when all services are started, or http://localhost:4000 when Linear is the only service.
URL Mapping
| Real Linear URL | Emulator URL |
|---|---|
https://api.linear.app/graphql |
$LINEAR_EMULATOR_URL/graphql |
https://linear.app/oauth/authorize |
$LINEAR_EMULATOR_URL/oauth/authorize |
https://api.linear.app/oauth/token |
$LINEAR_EMULATOR_URL/oauth/token |
https://api.linear.app/oauth/revoke |
$LINEAR_EMULATOR_URL/oauth/revoke |
Auth
GraphQL accepts a bearer token or bare personal API key:
curl "$LINEAR_EMULATOR_URL/graphql" \
-H "Authorization: Bearer lin_test_admin" \
-H "Content-Type: application/json" \
-d '{"query":"{ viewer { id email } }"}'
Scope checks are relaxed by default. Set linear.strict_scopes: true in seed config to require supported operation scopes such as read, write, issues:create, comments:create, and admin.
Seed Config
linear:
organization:
name: Acme
url_key: acme
users:
- email: [email protected]
name: Admin User
admin: true
- email: [email protected]
name: Developer
teams:
- key: ENG
name: Engineering
issues:
- team: ENG
title: Fix local checkout test
state: Todo
assignee: [email protected]
oauth_apps:
- client_id: lin_example_client_id
client_secret: example_client_secret
name: My Linear App
redirect_uris:
- http://localhost:3000/api/auth/callback/linear
scopes: [read, write, issues:create, comments:create]
tokens:
- token: lin_test_admin
user: [email protected]
scopes: [read, write, issues:create, comments:create, admin]
strict_scopes: false
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.
- 21d ago Changed · +2 lines c58299c113e8
- 29d ago Changed · +4 lines 9dc46dbeb099
- 1mo ago Changed · +2 lines 9a50b61a2bcc
- 1mo ago First seen · 126 lines · 100 tokens per session scan A c67e1188044b
linear is a skill published in the GitHub repository vercel-labs/emulate (1,947 stars, last pushed 2d ago), licensed Apache-2.0. It adds 100 tokens to every session and 1,370 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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