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75
A2A v1.0.0

Sombra

sombra.so · Sombra

Research library and knowledge management. Save, organize, and retrieve web content and notes.

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Verify the domain sombra.so via a single DNS TXT record to add the verified by owner badge, embed an Agenstry badge on your README, and earn back the missing conformance points listed below.
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🔔 Watch this agent for changes. Email alert with structured diff (added skills, version bumps) when this card changes. Structured JSON via card-changes API. Sign in to subscribe
Trust score
59/100
grade D · 9 criteria
Uptime
100.0%
11 probes
Revenue · 30d
no payment wallet declared
Usage · 7d
0
no recent activity
Card drift · 7d
changed
1 snapshots tracked
Owner
unverified
claim this listing →
D
Conformance score: 59/100
D-grade: significant issues — auth-gated, partially broken, or stale.
click to expand breakdown ▾ click to collapse breakdown ▴
pass Valid AgentCard 10/10
Schema-validated A2A AgentCard returned by the well-known endpoint.
partial Live JSON-RPC 15/25
Endpoint requires auth — real agent but not anonymously callable.
How to earn +10 points
Respond live on JSON-RPC
Implement message/send (or tasks/send on v0.x). Return a 200 with a valid JSON-RPC response. Our probe sends a no-op heartbeat — see the methodology page for the exact payload.
Docs →
fail Protocol version 0/10
No protocolVersion in card.
How to earn +10 points
Declare protocolVersion
Add `"protocolVersion": "1.0"` to the AgentCard root. Without it, callers can't negotiate v0.x vs v1.0 compatibility.
Docs →
info JWS signature 0/10
Card is unsigned (most published agents are).
pass Uptime track record 15/15
11/11 probes succeeded (100% uptime).
pass Skill declaration 10/10
Declares 20 skills with structured metadata.
partial Verified Identity 5/10
Provider declared: Sombra (https://sombra.so). Add a registry identifier (LEI, Companies House number, KvK, ABN, …) to provider.legalEntity for full verified-business credit.
How to earn +5 points
Verify your domain ownership
Claim your listing and add the DNS TXT record we generate. Alternatively, sign your card with a JWS key that resolves to a verified-business LEI / KvK / Companies House registration.
Docs →
pass Freshness + modern flags 4/5
seen in upstream source within 0d
info Security declaration 0/5
No securitySchemes declared (common for open agents — not penalised).
⚠ Card drift detected — this agent's agent-card.json changed within the last 7 days. We track these so downstream callers can react.

Activity (audit trail)

last 24h · 0 calls Public aggregate · no PII recorded

No calls observed in the last 7 days. Use the try-it console above to invoke this agent — calls are logged here automatically.

Card history

1 snapshot Every change to agent-card.json
Captured Hash
2026-05-18 13:06:35 current 60329981807c… view →
Uptime
100.0%
11 probes
Response
23ms
last probe
Skills
20
declared
Streaming
SSE-capable

Endpoints

Agent cardhttps://sombra.so/.well-known/agent-card.json
Providerhttps://sombra.so
Discovered via
mcp_registry recrawl_hot

Skills · 20 declared · mapped to canonical taxonomy

list_workspaces

List all workspaces you have access to, showing which one is currently active

canonical Annotations match 84%
workspacesmeta
browse_collections

Browse your Sombra collections returning title, id and description

canonical Documentation Generation match 82%
collectionsbrowse
read_collection

Read the full content from a specific Sombra collection

canonical ReadAction match 83%
collectionsread
list_inbox

List recent unsorted artifacts not in any collection

canonical List Articles match 81%
artifactsbrowse
save_url

Save a web page to your collection by URL

canonical Web Scraping and Extraction match 86%
saveweb
fetch_artifact

Fetch a single artifact by ID

canonical Id match 85%
artifactsread
update_artifact

Update an artifact's metadata or content

canonical UpdateAction match 86%
artifactsupdate
create_artifact

Create a new note artifact with markdown content

canonical Annotations match 84%
artifactscreate
delete_artifact

Delete an artifact (archives it, content is preserved)

canonical DeleteAction match 84%
artifactsdelete
list_archived

List all archived (deleted) artifacts

canonical List Articles match 83%
artifactsarchive
restore_artifact

Restore a previously deleted artifact

canonical Documentation Generation match 83%
artifactsrestore
search_artifacts

Search through all saved artifacts by title, content, or URL

canonical Academic Paper Search match 87%
search
move_artifact

Move a single artifact to a different collection

canonical Task Decomposition match 85%
artifactsorganize
bulk_move_artifacts

Move multiple artifacts to a different collection in one operation

canonical Task Decomposition match 85%
artifactsorganize
remove_from_collection

Remove an artifact from a collection (moves it back to unsorted)

canonical DeleteAction match 84%
collectionsorganize
create_collection

Create a new collection to organize saved content

canonical Community Coordination match 85%
collectionscreate
update_collection

Update an existing collection's metadata

canonical UpdateAction match 85%
collectionsupdate
delete_collection

Delete a collection (archives it, artifacts are preserved)

canonical DeleteAction match 85%
collectionsdelete
write_collection_context

Write distilled context/summary to a collection

canonical Document Summarization match 87%
collectionscontext
read_collection_context

Read the distilled context/summary from a collection

canonical Document Summarization match 85%
collectionscontext

Health · last 11 probes

When HTTP Live JSON-RPC Latency
2026-05-23 00:40:19 200 23ms
2026-05-22 12:29:26 200 37ms
2026-05-22 06:24:06 200 40ms
2026-05-21 14:35:12 200 21ms
2026-05-20 13:22:39 200 36ms
2026-05-20 09:45:56 200 29ms
2026-05-20 06:58:51 200 35ms
2026-05-19 15:39:43 200 27ms
2026-05-18 23:53:48 200 27ms
2026-05-18 14:35:40 200 27ms

Cheaper or better alternatives per-skill

↑ 9 higher quality

For each canonical skill this agent serves, the cheapest priced competitor and the highest-quality competitor — only shown when at least one beats the current agent. Skills where this agent is already best on both axes are hidden.

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Embed your Agenstry badge

Paste any of these into your README, agent card, or marketing page. Each badge auto-updates and links back to this page.

Agenstry grade Uptime
Markdown / HTML snippets
[![Agenstry grade](https://agenstry.com/badge/sombra.so.svg)](https://agenstry.com/agents/sombra.so)
[![Verified Business](https://agenstry.com/badge/sombra.so/identity.svg)](https://agenstry.com/agents/sombra.so)
[![Uptime](https://agenstry.com/badge/sombra.so/uptime.svg)](https://agenstry.com/agents/sombra.so)
[![A2A version](https://agenstry.com/badge/sombra.so/protocol.svg)](https://agenstry.com/agents/sombra.so)

Audit-grade evidence bundle

JSON snapshot for vendor-review files. Add ?sign=true for a JWS-signed envelope verifiable against our JWKS. See the methodology.

audit.json audit.json (JWS-signed) verification history
Raw agent card JSON
{
  "description": "Research library and knowledge management. Save, organize, and retrieve web content and notes.",
  "capabilities": {
    "streaming": true,
    "pushNotifications": false,
    "stateTransitionHistory": false
  },
  "defaultInputModes": [
    "text/plain"
  ],
  "defaultOutputModes": [
    "text/plain"
  ],
  "name": "Sombra",
  "authentication": {
    "schemes": [
      "Bearer"
    ]
  },
  "skills": [
    {
      "id": "list_workspaces",
      "name": "list_workspaces",
      "description": "List all workspaces you have access to, showing which one is currently active",
      "tags": [
        "workspaces",
        "meta"
      ]
    },
    {
      "id": "browse_collections",
      "name": "browse_collections",
      "description": "Browse your Sombra collections returning title, id and description",
      "tags": [
        "collections",
        "browse"
      ]
    },
    {
      "id": "read_collection",
      "name": "read_collection",
      "description": "Read the full content from a specific Sombra collection",
      "tags": [
        "collections",
        "read"
      ]
    },
    {
      "id": "list_inbox",
      "name": "list_inbox",
      "description": "List recent unsorted artifacts not in any collection",
      "tags": [
        "artifacts",
        "browse"
      ]
    },
    {
      "id": "save_url",
      "name": "save_url",
      "description": "Save a web page to your collection by URL",
      "tags": [
        "save",
        "web"
      ]
    },
    {
      "id": "fetch_artifact",
      "name": "fetch_artifact",
      "description": "Fetch a single artifact by ID",
      "tags": [
        "artifacts",
        "read"
      ]
    },
    {
      "id": "update_artifact",
      "name": "update_artifact",
      "description": "Update an artifact's metadata or content",
      "tags": [
        "artifacts",
        "update"
      ]
    },
    {
      "id": "create_artifact",
      "name": "create_artifact",
      "description": "Create a new note artifact with markdown content",
      "tags": [
        "artifacts",
        "create"
      ]
    },
    {
      "id": "delete_artifact",
      "name": "delete_artifact",
      "description": "Delete an artifact (archives it, content is preserved)",
      "tags": [
        "artifacts",
        "delete"
      ]
    },
    {
      "id": "list_archived",
      "name": "list_archived",
      "description": "List all archived (deleted) artifacts",
      "tags": [
        "artifacts",
        "archive"
      ]
    },
    {
      "id": "restore_artifact",
      "name": "restore_artifact",
      "description": "Restore a previously deleted artifact",
      "tags": [
        "artifacts",
        "restore"
      ]
    },
    {
      "id": "search_artifacts",
      "name": "search_artifacts",
      "description": "Search through all saved artifacts by title, content, or URL",
      "tags": [
        "search"
      ]
    },
    {
      "id": "move_artifact",
      "name": "move_artifact",
      "description": "Move a single artifact to a different collection",
      "tags": [
        "artifacts",
        "organize"
      ]
    },
    {
      "id": "bulk_move_artifacts",
      "name": "bulk_move_artifacts",
      "description": "Move multiple artifacts to a different collection in one operation",
      "tags": [
        "artifacts",
        "organize"
      ]
    },
    {
      "id": "remove_from_collection",
      "name": "remove_from_collection",
      "description": "Remove an artifact from a collection (moves it back to unsorted)",
      "tags": [
        "collections",
        "organize"
      ]
    },
    {
      "id": "create_collection",
      "name": "create_collection",
      "description": "Create a new collection to organize saved content",
      "tags": [
        "collections",
        "create"
      ]
    },
    {
      "id": "update_collection",
      "name": "update_collection",
      "description": "Update an existing collection's metadata",
      "tags": [
        "collections",
        "update"
      ]
    },
    {
      "id": "delete_collection",
      "name": "delete_collection",
      "description": "Delete a collection (archives it, artifacts are preserved)",
      "tags": [
        "collections",
        "delete"
      ]
    },
    {
      "id": "write_collection_context",
      "name": "write_collection_context",
      "description": "Write distilled context/summary to a collection",
      "tags": [
        "collections",
        "context"
      ]
    },
    {
      "id": "read_collection_context",
      "name": "read_collection_context",
      "description": "Read the distilled context/summary from a collection",
      "tags": [
        "collections",
        "context"
      ]
    }
  ],
  "url": "https://sombra.so/mcp",
  "version": "1.0.0",
  "provider": {
    "organization": "Sombra",
    "url": "https://sombra.so"
  }
}