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lsp-simulate SKILL.md skillA

lsp-simulate from blackwell-systems/agent-lsp is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add blackwell-systems/agent-lsp/lsp-simulate@git:20261104.5790d48

Pins git:20261104.5790d48 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: blackwell-systems/agent-lsp
Path: skills/lsp-simulate/SKILL.md
Versions recorded: 6
Latest version: git:20261104.5790d48, committed Nov 4, 2026
First version recorded: Apr 9, 2026
Size: 7,420 bytes
Repository stars: 173
License: MIT

Speculative code editing session — simulate changes in memory before touching disk. Use when planning edits that might break things, exploring refactors across multiple files, or verifying an edit is safe before applying.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

> Requires the agent-lsp MCP server.

# lsp-simulate

Simulate code edits in memory before writing to disk. The LSP server applies
your changes to an in-memory overlay, runs diagnostics, and reports whether
the edit is safe — without touching any files.

## Prerequisites

LSP must be running for the target workspace. If not yet initialized, call
`start_lsp` before any simulation tool.

```
mcp__agent-lsp__start_lsp(root_dir: "/your/workspace")
```

Auto-init note: agent-lsp supports workspace auto-inference from file paths.
Explicit `start_lsp` is only needed when switching workspace roots.

## Quick Start (single edit)

For a single what-if check, use `preview_edit` — it creates a session,
applies the edit, evaluates, and destroys the session in one call:

```
mcp__agent-lsp__preview_edit(
  workspace_root: "/your/workspace",
  language: "go",
  file_path: "/abs/path/to/file.go",
  start_line: 42, start_column: 1,
  end_line: 42, end_column: 20,
  new_text: "replacement text"
)
```

Result:

```
{ net_delta: 0 }   -- safe to apply
{ net_delta: 2 }   -- 2 new errors introduced; do NOT apply
```

`net_delta: 0` means no new errors were introduced. Positive values mean
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add blackwell-systems/agent-lsp/lsp-simulate@sha256:bca78d839e347234

The line at the top of this page pins the label git:20261104.5790d48, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_v5x7xwj63qcmnhtl.svg)](https://markdownregistry.com/a/art_v5x7xwj63qcmnhtl)

4 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 6 versions of this file, between Apr 9, 2026 and Nov 4, 2026, about one every 42 days.

version	committed	commit	size	audit
git:20261104.5790d48 latest	2026-11-04	5790d48	7,420 B	A	view · diff
git:20260510.2c5eef2	2026-05-10	2c5eef2	7,282 B	A	view · diff
git:20260423.987030a	2026-04-23	987030a	7,306 B	A	view · diff
git:20260423.0c48c28	2026-04-23	0c48c28	7,285 B	A	view · diff
git:20260422.b42794c	2026-04-22	b42794c	7,272 B	A	view · diff
git:20260409.2a593e8	2026-04-09	2a593e8	7,169 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (7420 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

blackwell-systems/agent-lsp · 173 stars · license MIT · pushed 2026-11-07 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_v5x7xwj63qcmnhtl
GET https://markdownregistry.com/api/v1/resolve?ref=blackwell-systems/agent-lsp/lsp-simulate
GET https://markdownregistry.com/api/v1/blob/bca78d839e347234aa7609ab06d5327edd8870aa1139642c68003952333febb7

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.