ESP32 Simulator
NPM · ESP32SIM-MCP
Boot and test ESP32 firmware in a local emulator: UART asserts, buttons, virtual WiFi, screenshots.
Available components
Last scanned (8 hours ago)
Scores higher than 74% of npm servers
Category Testing and QA
How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. How we score → Why this is hard to score →
Supply Chain Security98
- No malware found by supply-chain analysis.Pass
- No known CVEs affecting this package version or its production dependencies.Pass
- No install/post-install scripts declared.Pass
- 30 of 96 dependencies flagged as unhealthy. View diagnostics → Partial
Provenance & Transparency100
- Source repository is publicly reachable at the declared URL. View diagnostics → Pass
- Cryptographically verified build provenance (signed, bound to stramanu/esp32sim-mcp). View diagnostics → Pass
- Clear OSI-approved license (MIT).Pass
- Actively maintained (last published 5 days ago).Pass
- Publishes a security disclosure policy (SECURITY.md).Pass
Schema Quality & AI Usability74
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 1574 tokens (~196/item across 8 items; 6 tools + 2 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management0
- Stability not yet verified: not enough scan history yet (needs a 30-day window).Unverified
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Unverified: 1 category
A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 20 Oct 26 +15
- Malware scan: unverified → pass ▲ security
- 19 Oct 26 66
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 25 Oct 2026 · Analysed npm/esp32sim-mcp@0.2.6
Provenance Verified
A signed build attestation was found and verified, binding this exact artifact to the source repository it claims to come from.
| Result | Verified |
|---|---|
| Ecosystem | npm |
| Reason | Verified |
| Discovered via | Registry attestation endpoint |
| Source repo | stramanu/esp32sim-mcp |
| Certificate issuer | https://token.actions.githubusercontent.com |
| Certificate SAN | https://github.com/stramanu/esp32sim-mcp/.github/workflows/release.yml@refs/tags/v0.2.6 |
| Rekor log index | 3326073920 |
| Predicate type | SLSA build provenance https://slsa.dev/provenance/v1 |
| Subject digest | sha512:e6e3fad177dd3db3b6019bf95ed5e27d9f72db4f27cfa1e74c0dc2f762d47be8c0a342f2ddd821ac768ab1fa59015868915b48d531b37fd85ddb95e30 |
Background: How many MCP packages publish verified provenance →
Dependencies 96 packages
| Packages resolved | 96 |
|---|---|
| Stale | 30 |
| Tree resolution | Complete |
Background: SBOMs and build attestations, explained →
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
sim_doctor ~33
Validates local environment: checks if esp32sim binary is installed, checks Rust/Cargo, and provides setup instructions.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
sim_expect ~415
Runs firmware in simulation and asserts that specific text or regex patterns appear on UART. Ideal for automated unit & integration testing in a Red-Green-Refactor agent loop.
| Name | Type | Req | Description |
|---|---|---|---|
| appBin | string | – | Direct path to the application binary (.bin). |
| board | string | – | Board model: S3 'atech14' (default), 'waveshare-lcd4b', 'waveshare-amoled18-v2', 'waveshare-cam'; C6 'waveshare-c6-lcd147'; ESP32 'ttgo-tdisplay', 'esp32dev-loopback'; 'none' for a bare module. Omit… |
| bootloaderBin | string | – | Direct path to bootloader.bin (needed with appBin for a real ROM boot). |
| chip | string | – | Target chip family. Default is s3 (ESP32-S3). |
| events | array | – | Optional interaction events before checking patterns. |
| maxSeconds | number | – | Max emulated seconds to wait for patterns (default 10). |
| ordered | boolean | – | Whether patterns must appear in exact chronological sequence (default: true). |
| patterns | array | yes | Expected console output. Plain text matches as a substring of a line ("Counter: 5"); write a regular expression between slashes ("/Counter: \\d+/", "/wifi.*connected/i"). |
| projectDir | string | – | Path to the ESP-IDF project root or build folder. If omitted, uses current working directory. |
| ptableBin | string | – | Direct path to partition-table.bin (needed with appBin for a real ROM boot). |
| wifi | string | – | Attach a virtual access point with DHCP/DNS/NAT. Spec like 'ssid=demo,psk=secret' (keys: ssid, psk, chan, bssid), or a bare SSID for an open network. Station gets 10.0.2.15. |
No output schema declared.
No examples provided.
sim_list_boards ~40
Returns the catalogue of all supported ESP32 chips, boards, displays, peripherals and capabilities.
| Name | Type | Req | Description |
|---|---|---|---|
| chip | string | – | Filter boards by chip family. |
No output schema declared.
No examples provided.
sim_run ~436
Boots and simulates ESP32 firmware in a local emulator without hardware. Captures UART logs, FreeRTOS asserts, memory faults, and stop reason.
| Name | Type | Req | Description |
|---|---|---|---|
| appBin | string | – | Direct path to the application binary (.bin). |
| board | string | – | Board model: S3 'atech14' (default), 'waveshare-lcd4b', 'waveshare-amoled18-v2', 'waveshare-cam'; C6 'waveshare-c6-lcd147'; ESP32 'ttgo-tdisplay', 'esp32dev-loopback'; 'none' for a bare module. Omit… |
| bootloaderBin | string | – | Direct path to bootloader.bin (needed with appBin for a real ROM boot). |
| chip | string | – | Target chip family. Default is s3 (ESP32-S3). |
| console | string | – | Console source to capture (default: both = UART0 + USB-Serial/JTAG). Lines ESP-IDF mirrors on both consoles are shown once. |
| maxSeconds | number | – | Maximum emulated time in seconds (default: 10s). Emulation usually runs faster than real time. |
| projectDir | string | – | Path to the ESP-IDF project root or build folder. If omitted, uses current working directory. |
| ptableBin | string | – | Direct path to partition-table.bin (needed with appBin for a real ROM boot). |
| stopAfterExceptions | number | – | Stop after N CPU exceptions (unset by default). Counts every exception, including the window overflow/underflow ones Xtensa firmware takes constantly, so it is a debugging aid, not a crash detector.… |
| wifi | string | – | Attach a virtual access point with DHCP/DNS/NAT. Spec like 'ssid=demo,psk=secret' (keys: ssid, psk, chan, bssid), or a bare SSID for an open network. Station gets 10.0.2.15. |
No output schema declared.
No examples provided.
sim_screenshot ~222
Captures a snapshot image of the virtual LCD/TFT display buffer at a specified emulated time.
| Name | Type | Req | Description |
|---|---|---|---|
| appBin | string | – | Direct path to the application binary (.bin). |
| board | string | – | Board with a display: 'atech14', 'waveshare-lcd4b', 'waveshare-amoled18-v2' (S3), 'waveshare-c6-lcd147' (C6), 'ttgo-tdisplay' (ESP32). |
| bootloaderBin | string | – | Direct path to bootloader.bin (needed with appBin for a real ROM boot). |
| chip | string | – | Target chip family. Default is s3 (ESP32-S3). |
| projectDir | string | – | Path to the ESP-IDF project root or build folder. If omitted, uses current working directory. |
| ptableBin | string | – | Direct path to partition-table.bin (needed with appBin for a real ROM boot). |
| timeSeconds | number | – | Emulated second at which to take the screenshot. |
No output schema declared.
No examples provided.
sim_script ~381
Simulates hardware interactions (button presses, GPIO levels, rotary encoder turns, touch, UART/console input) at specific emulated timestamps, capturing interactive firmware behavior.
| Name | Type | Req | Description |
|---|---|---|---|
| appBin | string | – | Direct path to the application binary (.bin). |
| board | string | – | Board model: S3 'atech14' (default), 'waveshare-lcd4b', 'waveshare-amoled18-v2', 'waveshare-cam'; C6 'waveshare-c6-lcd147'; ESP32 'ttgo-tdisplay', 'esp32dev-loopback'; 'none' for a bare module. Omit… |
| bootloaderBin | string | – | Direct path to bootloader.bin (needed with appBin for a real ROM boot). |
| chip | string | – | Target chip family. Default is s3 (ESP32-S3). |
| events | array | – | Host actions at emulated times. |
| maxSeconds | number | – | Total simulation duration in seconds (default 15). |
| projectDir | string | – | Path to the ESP-IDF project root or build folder. If omitted, uses current working directory. |
| ptableBin | string | – | Direct path to partition-table.bin (needed with appBin for a real ROM boot). |
| scriptContent | string | – | Raw esp32sim script text instead of events (e.g. "1.5 press btn1 150\n3.0 stop"). |
| wifi | string | – | Attach a virtual access point with DHCP/DNS/NAT. Spec like 'ssid=demo,psk=secret' (keys: ssid, psk, chan, bssid), or a bare SSID for an open network. Station gets 10.0.2.15. |
No output schema declared.
No examples provided.
How do I install the ESP32 Simulator MCP server?
ESP32 Simulator runs locally as an npm package, launched with npx -y esp32sim-mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
npm · esp32sim-mcp
claude mcp add stramanu-esp32sim-mcp -- npx -y esp32sim-mcp
What is the ESP32 Simulator MCP server?
ESP32 Simulator is an MCP server listed in the public MCP registry as io.github.stramanu/esp32sim-mcp. Boot and test ESP32 firmware in a local emulator: UART asserts, buttons, virtual WiFi, screenshots. This page covers its npm package (esp32sim-mcp).
Is the ESP32 Simulator MCP server safe to use?
ESP32 Simulator scores 81 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 25 October 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the ESP32 Simulator MCP server expose?
ESP32 Simulator exposes 6 tools: sim_run, sim_script, sim_expect, sim_screenshot, sim_list_boards, sim_doctor. Their descriptions and schemas cost roughly 1,527 tokens of context every time the server is loaded.
Is the ESP32 Simulator MCP server still maintained?
ESP32 Simulator is still listed as active in the MCP registry. We last reached this channel on 25 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.
What licence is the ESP32 Simulator MCP server under?
ESP32 Simulator declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.