REAPER MCP
PYPI · TWELVETAKE-REAPER-MCP · SCANNED OCT 5
Lets an AI assistant work in your open REAPER project: mixing, MIDI, routing and rendering.
Available components
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 Security100
- No malware found by supply-chain analysis.Pass
- No known CVEs affecting this package version or its production dependencies.Pass
- Runs hatchling.build at install time, a recognised build step with no custom scripting around it. View diagnostics → Pass
- 0 of 28 dependencies flagged as unhealthy. View diagnostics → Pass
Provenance & Transparency97
- Source repository is publicly reachable at the declared URL. View diagnostics → Pass
- Cryptographically verified build provenance (signed, bound to TwelveTake-Studios/reaper-mcp). View diagnostics → Pass
- Clear OSI-approved license (MIT).Pass
- Actively maintained (last published 5 days ago).Pass
- Disclosure check failed: no security disclosure policy was found in the source repository. See how to fix → Fail
Schema Quality & AI Usability71
- AI-judged instruction clarity (good).Pass
- Tool/resource definitions use about 14311 tokens (~79/item across 179 items; 179 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management23
- Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage67
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 0% of tool parameters carry a description.Fail
Tool Safety99
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- 21 of 22 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "get_track_master_send" implies "send" and declares readOnlyHint instead, contradicting what its own name says it does. See how to fix → Partial
- An AI judge read all 180 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
How do I install the REAPER MCP server?
REAPER MCP runs locally as a PyPI package, launched with uvx twelvetake-reaper-mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
pypi · twelvetake-reaper-mcp
claude mcp add com-twelvetake-reaper-mcp -- uvx twelvetake-reaper-mcp
{
"mcpServers": {
"com-twelvetake-reaper-mcp": {
"command": "uvx",
"args": [
"twelvetake-reaper-mcp"
]
}
}
} {
"servers": {
"com-twelvetake-reaper-mcp": {
"command": "uvx",
"args": [
"twelvetake-reaper-mcp"
]
}
}
} codex mcp add com-twelvetake-reaper-mcp -- uvx twelvetake-reaper-mcp
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"com-twelvetake-reaper-mcp": {
"type": "local",
"command": [
"uvx",
"twelvetake-reaper-mcp"
],
"enabled": true
}
}
} openclaw mcp add com-twelvetake-reaper-mcp --command uvx --arg twelvetake-reaper-mcp
mcp_servers:
com-twelvetake-reaper-mcp:
command: "uvx"
args: ["twelvetake-reaper-mcp"] {
"McpServers": {
"com-twelvetake-reaper-mcp": {
"Transport": "stdio",
"Command": "uvx",
"Arguments": [
"twelvetake-reaper-mcp"
]
}
}
} assistant mcp add com-twelvetake-reaper-mcp -t stdio -c uvx -a twelvetake-reaper-mcp
{
"mcpServers": {
"com-twelvetake-reaper-mcp": {
"command": "uvx",
"args": [
"twelvetake-reaper-mcp"
]
}
}
} 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.
- 5 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.
- 3 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.
- 1 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.
- 30 Sept 26 +15
- Malware scan: unverified → pass ▲ security
- 29 Sept 26 +1
- Malware scan: unverified → pass ▲ security
- Stability: unverified → 0.03 ▲ functional
- Package version: 1.7.7 → 1.8.0 functional
- Package version: 1.7.7 → 1.7.8 functional
- 28 Sept 26 62
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 9 Oct 2026 · Analysed pypi/twelvetake-reaper-mcp@1.8.0
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 | pypi |
| Reason | Verified |
| Discovered via | Registry attestation endpoint |
| Source repo | TwelveTake-Studios/reaper-mcp |
| Certificate issuer | https://token.actions.githubusercontent.com |
| Certificate SAN | https://github.com/TwelveTake-Studios/reaper-mcp/.github/workflows/publish.yml@refs/tags/v1.8.0 |
| Rekor log index | 3005286116 |
| Predicate type | PyPI publish attestation https://docs.pypi.org/attestations/publish/v1 |
| Subject digest | sha256:5fb6fbfee502e798307c6c039367c69e24da4cf5a5a4f5ca693a6525d65f9cf4 |
Background: How many MCP packages publish verified provenance →
Install scripts 1 script
| Hook | Tier | Command |
|---|---|---|
| build_backend | allowlisted | hatchling.build |
Background: Why install scripts are a supply-chain risk →
Dependencies 28 packages
| Packages resolved | 28 |
|---|---|
| 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 →
add_compressor ~33
Add ReaComp to a track. Returns: Object with fx_index.
| Name | Type | Req | Description |
|---|---|---|---|
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
add_envelope_point ~136
Add a point to an envelope. Args: envelope_name: Envelope name. time: Time position in seconds. value: Envelope value (0.0-1.0 for most envelopes). shape: Point shape (0=linear, 1=square, 2=slow start/end, 3=fast start, 4=fast end, 5=bezier). Returns: Object with point index.
| Name | Type | Req | Description |
|---|---|---|---|
| envelope_name | string | yes | – |
| shape | integer | – | – |
| time | number | yes | – |
| track_index | integer | yes | – |
| value | number | yes | – |
No output schema declared.
No examples provided.
add_eq ~32
Add ReaEQ to a track. Returns: Object with fx_index.
| Name | Type | Req | Description |
|---|---|---|---|
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
add_fx_envelope_point ~144
Add an automation point to an FX parameter envelope. Args: time: Time position in seconds. value: Parameter value (typically 0.0-1.0, normalized). shape: Point shape (0=linear, 1=square, 2=slow start/end, 3=fast start, 4=fast end, 5=bezier). Returns: Object with point_index and confirmation.
| Name | Type | Req | Description |
|---|---|---|---|
| fx_index | integer | yes | – |
| param_index | integer | yes | – |
| shape | integer | – | – |
| time | number | yes | – |
| track_index | integer | yes | – |
| value | number | yes | – |
No output schema declared.
No examples provided.
add_limiter ~38
Add ReaLimit (brickwall limiter) to a track. Returns: Object with fx_index.
| Name | Type | Req | Description |
|---|---|---|---|
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
add_marker ~69
Add a marker at a position. Args: position: Position in seconds. name: Marker name. color: Marker color (0 = default). Returns: Object with marker index.
| Name | Type | Req | Description |
|---|---|---|---|
| color | integer | – | – |
| name | string | – | – |
| position | number | yes | – |
No output schema declared.
No examples provided.
add_mastering_chain ~78
Add a standard mastering chain to the master track. Adds the following plugins in order: 1. ReaEQ (corrective EQ) 2. ReaComp (glue compression) 3. ReaEQ (tonal shaping) 4. ReaLimit (brickwall limiter) Returns: Object with list of added FX indices.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
add_midi_note ~210
Add a MIDI note to an item using musical timing (beats). Args: pitch: MIDI note number (0-127, 60 = middle C). velocity: Note velocity (1-127). start_beat: Start position in beats from the item start (0 = first beat). length_beats: Note length in beats (0.25 = sixteenth, 0.5 = eighth, 1.0 = quarter). Example: Four-on-the-floor kick: add_midi_note(0, 0, 36, 110, start_beat=0, length_beats=0.25) then start_beat=1, 2, 3.
| Name | Type | Req | Description |
|---|---|---|---|
| channel | integer | – | – |
| item_index | integer | yes | – |
| length_beats | number | yes | – |
| pitch | integer | yes | – |
| start_beat | number | yes | – |
| track_index | integer | yes | – |
| velocity | integer | yes | – |
No output schema declared.
No examples provided.
add_midi_notes_batch ~91
Add multiple MIDI notes to an item in one call, using musical timing (beats). Args: notes: List of note dicts with keys: pitch, velocity, start_beat, length_beats, channel (optional). Returns: Object with count of notes added.
| Name | Type | Req | Description |
|---|---|---|---|
| item_index | integer | yes | – |
| notes | array | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
add_parallel_compression ~105
Set up New York style parallel compression for a track. Creates a new bus track with heavy compression, fed by a send from the source track. Args: track_index: Source track index (0-based). blend_db: Send level in dB for the compressed signal (default -6dB). Returns: Object with bus_track_index, send_index, and compressor_fx_index.
| Name | Type | Req | Description |
|---|---|---|---|
| blend_db | number | – | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
add_region ~82
Add a region. Args: start: Start position in seconds. end: End position in seconds. name: Region name. color: Region color (0 = default). Returns: Object with region index.
| Name | Type | Req | Description |
|---|---|---|---|
| color | integer | – | – |
| end | number | yes | – |
| name | string | – | – |
| start | number | yes | – |
No output schema declared.
No examples provided.
arm_track ~46
Arm or disarm a track for recording. Args: arm: True to arm, False to disarm.
| Name | Type | Req | Description |
|---|---|---|---|
| arm | boolean | – | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
arm_track_envelope ~63
Arm or disarm an envelope for recording. Args: envelope_name: Envelope name. arm: True to arm, False to disarm.
| Name | Type | Req | Description |
|---|---|---|---|
| arm | boolean | – | – |
| envelope_name | string | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
clear_all_peak_indicators ~50
Clear the peak hold indicators on all tracks (including master). Resets the held peak values that accumulate during playback. Use before a fresh playback pass when you want clean readings for gain staging.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
clear_envelope ~41
Delete all points from an envelope. Args: envelope_name: Envelope name.
| Name | Type | Req | Description |
|---|---|---|---|
| envelope_name | string | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
clear_fx_envelope ~52
Clear all automation points from an FX parameter envelope. Returns: Object with deleted_count.
| Name | Type | Req | Description |
|---|---|---|---|
| fx_index | integer | yes | – |
| param_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
clear_midi_item ~44
Delete all MIDI notes from an item. Returns: Object with count of notes deleted.
| Name | Type | Req | Description |
|---|---|---|---|
| item_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
clear_time_selection ~14
Clear the time selection.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
configure_reacomp_sidechain ~117
Configure ReaComp to use sidechain input for detection. Args: track_index: Track index (0-based) where ReaComp is located. fx_index: FX index (0-based) of ReaComp in the FX chain. use_sidechain: True to use auxiliary input (channels 3-4), False for main input. Returns: Object with configuration status.
| Name | Type | Req | Description |
|---|---|---|---|
| fx_index | integer | yes | – |
| track_index | integer | yes | – |
| use_sidechain | boolean | – | – |
No output schema declared.
No examples provided.
copy_selected_items ~15
Copy selected items to clipboard.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
create_bus ~76
Create a submix/stem bus and route specified tracks to it. Args: name: Name for the bus track. source_track_indices: List of track indices to route to this bus. Returns: Object with bus_track_index and routing info.
| Name | Type | Req | Description |
|---|---|---|---|
| name | string | yes | – |
| source_track_indices | array | yes | – |
No output schema declared.
No examples provided.
create_midi_item ~71
Create an empty MIDI item on a track. Args: position: Start position in seconds. length: Length in seconds. Returns: Object with item info including the new item_index.
| Name | Type | Req | Description |
|---|---|---|---|
| length | number | yes | – |
| position | number | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
create_project ~54
Create a new REAPER project. Note: REAPER has no API to name a project that has never been saved, so this server has no way to name one either. The removed `name` parameter never took effect.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
create_send ~65
Create a send from one track to another. Args: src_track: Source track index (0-based). dest_track: Destination track index (0-based). Returns: Object with send_index.
| Name | Type | Req | Description |
|---|---|---|---|
| dest_track | integer | yes | – |
| src_track | integer | yes | – |
No output schema declared.
No examples provided.
crop_to_active_take ~41
Crop a media item to its active take, discarding all other takes.
| Name | Type | Req | Description |
|---|---|---|---|
| item_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
cut_selected_items ~15
Cut selected items to clipboard.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
delete_envelope_point ~48
Delete an envelope point. Args: envelope_name: Envelope name.
| Name | Type | Req | Description |
|---|---|---|---|
| envelope_name | string | yes | – |
| point_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
delete_fx_envelope_point ~68
Delete an automation point from an FX parameter envelope. Args: point_index: Point index (0-based) to delete.
| Name | Type | Req | Description |
|---|---|---|---|
| fx_index | integer | yes | – |
| param_index | integer | yes | – |
| point_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
delete_item ~29
Delete a media item.
| Name | Type | Req | Description |
|---|---|---|---|
| item_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
delete_marker ~22
Delete a marker by index.
| Name | Type | Req | Description |
|---|---|---|---|
| marker_index | integer | yes | – |
No output schema declared.
No examples provided.
delete_midi_note ~42
Delete a MIDI note from an item.
| Name | Type | Req | Description |
|---|---|---|---|
| item_index | integer | yes | – |
| note_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
delete_region ~22
Delete a region by index.
| Name | Type | Req | Description |
|---|---|---|---|
| region_index | integer | yes | – |
No output schema declared.
No examples provided.
delete_selected_items ~14
Delete all selected items.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
delete_send ~57
Delete a send from a track. Args: track_index: Source track index (0-based). send_index: Send index (0-based) to delete.
| Name | Type | Req | Description |
|---|---|---|---|
| send_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
delete_take ~64
Delete a specific take from a media item. Args: take_index: Take index to delete (0-based). The take is activated first, then removed.
| Name | Type | Req | Description |
|---|---|---|---|
| item_index | integer | yes | – |
| take_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
delete_track ~41
Delete a track. Args: track_index: Track index to delete (0-based). Cannot delete master track (-1).
| Name | Type | Req | Description |
|---|---|---|---|
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
duplicate_item ~38
Duplicate a media item. Returns: Object with new item info.
| Name | Type | Req | Description |
|---|---|---|---|
| item_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
explode_takes ~44
Explode all takes of a media item in place (each take becomes its own overlapping item).
| Name | Type | Req | Description |
|---|---|---|---|
| item_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
find_eq ~79
Find ReaEQ on a track, optionally adding it if absent. Args: instantiate: If True and ReaEQ is not present, add it. Returns: Object with 'ret' = the FX index of ReaEQ, or -1 if not found.
| Name | Type | Req | Description |
|---|---|---|---|
| instantiate | boolean | – | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
get_active_take ~59
Get the index of the active take of a media item. Returns: Object with 'ret' = active take index (-1 if the item has no active take).
| Name | Type | Req | Description |
|---|---|---|---|
| item_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
get_all_tracks ~18
Get information about all tracks in the project.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
get_cursor_position ~25
Get the edit cursor position. Returns: Object with cursor position in seconds.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
get_envelope_point_count ~53
Get the number of points in an envelope. Args: envelope_name: Envelope name. Returns: Object with point count.
| Name | Type | Req | Description |
|---|---|---|---|
| envelope_name | string | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
get_envelope_points ~57
Get all points from an envelope. Args: envelope_name: Envelope name. Returns: Object with list of points (time, value, shape).
| Name | Type | Req | Description |
|---|---|---|---|
| envelope_name | string | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
get_eq_band_enabled ~140
Check whether a ReaEQ band is enabled. Args: fx_index: FX index (0-based) of ReaEQ. bandtype: Band type (0=hipass, 1=loshelf, 2=band, 3=notch, 4=hishelf, 5=lopass). bandidx: Band index within that type (0=first). Returns: Object with 'ret' boolean (true=enabled).
| Name | Type | Req | Description |
|---|---|---|---|
| bandidx | integer | – | – |
| bandtype | integer | yes | – |
| fx_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
get_eq_bands ~118
Get all ReaEQ band settings in one structured call. Args: fx_index: FX index (0-based) of ReaEQ in the FX chain. Returns: Object with a 'bands' list. Each band has band_index, bandtype, bandtype_name, bandidx, paramtype, paramtype_name, normval, the REAPER-formatted value, and (for gain params) the computed gain_db.
| Name | Type | Req | Description |
|---|---|---|---|
| fx_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
get_fx_envelope ~114
Get or create an automation envelope for an FX parameter. This enables automation of any FX parameter (e.g., a flanger knob in Guitar Rig). The envelope is created if it doesn't exist. Args: param_index: Parameter index (0-based). Use track_fx_get_num_params() to find available parameters. Returns: Object with envelope_name, param_name, point_count, and indices.
| Name | Type | Req | Description |
|---|---|---|---|
| fx_index | integer | yes | – |
| param_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
get_fx_envelope_points ~64
Get all automation points from an FX parameter envelope. Returns: Object with list of points (time, value, shape, tension, selected).
| Name | Type | Req | Description |
|---|---|---|---|
| fx_index | integer | yes | – |
| param_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
get_fx_preset ~44
Get the current preset name of an FX. Returns: Object with current preset name.
| Name | Type | Req | Description |
|---|---|---|---|
| fx_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
get_fx_presets ~45
Get list of presets available for an FX. Returns: Object with list of preset names.
| Name | Type | Req | Description |
|---|---|---|---|
| fx_index | integer | yes | – |
| track_index | integer | yes | – |
No output schema declared.
No examples provided.
What is the REAPER MCP server?
REAPER MCP is listed in the public MCP registry as com.twelvetake/reaper-mcp. Lets an AI assistant work in your open REAPER project: mixing, MIDI, routing and rendering. This page covers its PyPI package (twelvetake-reaper-mcp).
Is the REAPER MCP server safe to use?
REAPER MCP scores 81 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 5 October 2026. 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 REAPER MCP server expose?
REAPER MCP exposes 179 tools: get_track_count, get_track, get_all_tracks, get_master_track, insert_track, and 174 more. Their descriptions and schemas cost roughly 13,734 tokens of context every time the server is loaded.
Is the REAPER MCP server still maintained?
REAPER MCP is still listed as active in the MCP registry. We last reached this channel on 5 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 REAPER MCP server under?
REAPER MCP declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.