gHashTag · Oct 19, 2026 · Oct 18, 2026 · Oct 18, 2026 · Oct 19, 2026 · Oct 19, 2026
@@ -434,6 +434,51 @@ Traps:
   until a fixture had fewer edges than `hops=` *and* still ended at B. Give every refusal a
   fixture that only that refusal catches.
 
+### Draw who uses a spec as a card (t27#10720)
+
+`specs/t27f/deps_card.t27` draws one spec's neighbourhood. Its first three direct importers sit
+above it and its first three direct imports below it, with `+N more` past three and the
+transitive counts in the footer. A gold `ON AN IMPORT CYCLE` line appears when `deps_on_cycle`
+holds. It imports why_card's `card_*` helpers rather than copying them, and its main reads
+`DEPS_SPEC` and `DEPS_FONT`. Skill card: `t27/deps-card`. To build and render it, follow the
+why-card recipe above with `deps_card` in place of `why_card`.
+
+Pixel checks per row:
+
+- fill at (106, y+6);
+- stroke at (101, y+32);
+- fill at both inner edges (110 and 970);
+- backdrop in the gap at (300, y+70).
+
+Rows start at y = 280 + 76k above the focus and 820 + 76k below it. Then check:
+
+- the focus fill at (112, 650) and its 8 px stroke at (103, 688);
+- the connector at (540, 630) above and (540, 745) below, or the backdrop at those points when a
+  band is empty;
+- the white-pixel count in every row's text band.
+
+On 255910235 (2483 edge lines, 813 specs named):
+
+- 783 cards drew. `base/types` is the hub: 378 direct importers, reached by 400.
+- 30 were refused:
+  - 29 because the spec's own name is over 58 bytes (`port/trios/...`);
+  - 1 because a shown neighbour's name is.
+- No spec in the corpus is on an import cycle.
+- 70 of 70 pixel checks held on the hub, leaf and mid cards.
+
+Traps:
+
+- **A shell helper that sets `tag` clobbers the caller's `tag`.** POSIX `sh` has no `local`:
+  `rows()` setting `tag=$4` sent every later check to `up.png`, which does not exist. Name each
+  helper's variables apart.
+- **`sort -t "$TAB" -k3,3n -r` sorts ascending.** A key with its own ordering flag does not
+  inherit `-r`, so write `-k3,3nr`. In `sh`, `$'\t'` is two characters; use `TAB=$(printf '\t')`.
+- **A one-byte-short fit test cannot tell `w > cap` from `w > cap + k`.** Both return `cap + 1`
+  there. The original and the mutant only differ when the room is 2..k+1 bytes short, so the
+  test that kills the mutant is three bytes short, not ten.
+- **Bands are in edge-list order, so a hub shows `account/*` first.** That is the stated rule,
+  not a ranking; do not caption the first three as the most important.
+
 ## What this skill does not claim
 
 The graph IR is a schema (`specs/t27f/spec_graph.t27`) and `specs/t27f/spec_graph_export.t27` turns source into it, but only exact declarations, spans and edges within the IR's capacity, with `specs/t27f/spec_graph_derive.t27` adding the derived and unknown part by stated rules, and no host calls either yet; no renderer draws a T27F view in the Trinity UI, no

@@ -0,0 +1,28 @@
+{
+  "built_by": "t27c-bootstrap@0.5.2+9448ab4be",
+  "closure": [],
+  "config": "gen=c,rust,verilog,zig;tests=zig",
+  "gen_hash_c": "sha256:416288691c04ceaabc9f206bafc063de6a4fe2bf76eed4cec1e8ed7facbd23a4",
+  "gen_hash_rust": "sha256:1c2f00377a1c61e676f3ce92dcb7f9c0bcf7ef10750b16f7ad3b5b88b75c15a9",
+  "gen_hash_verilog": "sha256:4158a6d406b22bfef789ca15dc84c3d867e96e0ccb4aaca4d536fed85da9c8cd",
+  "gen_hash_zig": "sha256:fb59aa9ded647f4e34da11c01542d1a5ee40454dee7a5f36d7fb1379269b45b0",
+  "module": "skill_t27_deps_card",
+  "ring": 12,
+  "seal_schema": 2,
+  "sealed_at": "2026-10-19T00:03:42Z",
+  "sealed_by": "t27c-bootstrap@0.5.2",
+  "spec_hash": "sha256:2a603711c22872cdbd2f5898ac5980e9b920cd85857f881d6f40f482996f4cf2",
+  "spec_path": "specs/skills/t27-deps-card.t27",
+  "tests": {
+    "failed": 0,
+    "failing": [],
+    "forced": false,
+    "passed": 1,
+    "total": 1,
+    "vacuous": 0
+  },
+  "toolchain": {
+    "test_runner": "sha256:8512b80da533b79289110fca4a65f3336abd7a059ca4b72ea595d5e33ff8ad10",
+    "zig": "0.16.0"
+  }
+}
@@ -0,0 +1,53 @@
+{
+  "built_by": "t27c-bootstrap@0.5.2+9448ab4be",
+  "closure": [
+    {
+      "spec": "specs/ci/affected.t27",
+      "spec_hash": "sha256:38a7bdc245f1974f0d5f1a55a45966decd70098afdb89e882f568da3650ee9f9"
+    },
+    {
+      "spec": "specs/claw/t27f_gate.t27",
+      "spec_hash": "sha256:856be049f9ef3de20cce2f7d18ca3b78a5f4a8ad660dddd8f2cf1aa97bc61ee7"
+    },
+    {
+      "spec": "specs/policy/text_lines.t27",
+      "spec_hash": "sha256:13c90895a4a44c760cce6b3b65f72f937298633062f040f8489486108ab0c2d1"
+    },
+    {
+      "spec": "specs/t27f/spec_deps.t27",
+      "spec_hash": "sha256:c6e6c03537dd7238ce7cceb937dfe307294ab59d4946de95f7d96e40333cb070"
+    },
+    {
+      "spec": "specs/t27f/spec_graph_view.t27",
+      "spec_hash": "sha256:d4c318162bf52405208d4016d0505c8037cd648b58feb3ad5240a2695c6730fe"
+    },
+    {
+      "spec": "specs/t27f/why_card.t27",
+      "spec_hash": "sha256:01381c902fe4b5702dc26505a0d081faa0895bfaf60ef51a529cfef894a8ae68"
+    }
+  ],
+  "config": "gen=c,rust,verilog,zig;tests=zig",
+  "gen_hash_c": "sha256:e0771c20aea80a2d085ea8151707616be36da0a1075f48dcc81471b21dfb3624",
+  "gen_hash_rust": "sha256:8b918de8a45d5fb657999906ab375c03b0f4f75289bb4662a1d34143ba99886d",
+  "gen_hash_verilog": "sha256:ed6c7559eb3bb422722770679c14d41c53a6a56fe3521d444cdfc408b22eb66c",
+  "gen_hash_zig": "sha256:eecc2a4bc35cf81dff2bde43f15e53903728aa66d5898de7c916e60fefff1c38",
+  "module": "t27f_deps_card",
+  "ring": 12,
+  "seal_schema": 2,
+  "sealed_at": "2026-10-19T00:03:40Z",
+  "sealed_by": "t27c-bootstrap@0.5.2",
+  "spec_hash": "sha256:05e744da11ef490c883a7a46c9d5ee7869a1b21f50f1999e6dda0706d68b5f0d",
+  "spec_path": "specs/t27f/deps_card.t27",
+  "tests": {
+    "failed": 0,
+    "failing": [],
+    "forced": false,
+    "passed": 11,
+    "total": 11,
+    "vacuous": 0
+  },
+  "toolchain": {
+    "test_runner": "sha256:8512b80da533b79289110fca4a65f3336abd7a059ca4b72ea595d5e33ff8ad10",
+    "zig": "0.16.0"
+  }
+}
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: Apache-2.0
+; specs/skills/t27-deps-card.t27 -- skill t27/deps-card
+; Source of truth for the skill card on t27.ai (#/skills?skill=t27/deps-card).
+; How TRI CLAW answers "who uses this spec, and what does it use" with a picture: pipe
+; `t27c use-edges` into deps_card with DEPS_SPEC and DEPS_FONT set, and render the
+; graph it prints with ffmpeg as a 1080x1350 card: the spec's direct importers above
+; it, its direct imports below it, `+N more` past three, the transitive counts in the
+; footer, and a gold ON AN IMPORT CYCLE line when it is on one. The law lives once, in
+; specs/t27f/deps_card.t27 (dcard_* functions and their tests), the walk in
+; specs/t27f/spec_deps.t27 (deps_walk) and the drawing helpers in
+; specs/t27f/why_card.t27; this card points at them and copies none. Posting a card is
+; the owner's call. There is no SKILL.md behind it yet, so the card is spec-only (see
+; "Witness labels" in specs/skills/README.md). Issue gHashTag/t27#10720, epic
+; gHashTag/trinity#1648.
+; The JSON the site serves is generated from this file by the real compiler;
+; nothing below is parsed with a regex.
+; phi^2 + 1/phi^2 = 3 | TRINITY
+
+module skill_t27_deps_card;
+
+pub const KIND : str = "skill";
+pub const ID : str = "t27/deps-card";
+pub const NAME : str = "Deps Card";
+pub const REPO : str = "t27";
+; No SKILL.md exists for this card.
+pub const SOURCE : str = "";
+pub const SUMMARY_EN : str = "Draw who uses a spec and what it uses as a social card: its direct importers and imports t27c resolved, the transitive counts both ways, a cycle flag, and no card at all when the spec is not in the edge list";
+pub const COMMAND : str = "/deps-card";
+; Specs this skill stands on: the card layout and the walk it draws.
+pub const SPECS : [2]str = ["specs/t27f/deps_card.t27", "specs/t27f/spec_deps.t27"];
+pub const TAGS : [4]str = ["social-visual", "t27f", "deps", "card"];
+pub const ENABLED : bool = true;
+; Default budget; no SKILL.md declares a timeout.
+pub const TIMEOUT_MIN : u16 = 30;
+
+test basic_constants {
+    assert KIND == "skill";
+    assert ID == "t27/deps-card";
+    assert NAME == "Deps Card";
+    assert REPO == "t27";
+    assert SOURCE == "";
+    assert COMMAND == "/deps-card";
+    assert ENABLED == true;
+    assert TIMEOUT_MIN == 30;
+    assert TAGS.len == 4;
+    assert TAGS[0] == "social-visual";
+    assert TAGS[2] == "deps";
+    assert SPECS.len == 2;
+    assert SPECS[0] == "specs/t27f/deps_card.t27";
+    assert SPECS[1] == "specs/t27f/spec_deps.t27";
+}